Sacchi, N., La Franca, F., Feruglio, C., Fiore, F., Puccetti, S., Cocchia, F., ...
We present a catalog of optical spectroscopic identifications of sources detected by Spitzer at 3.6 or 24 μm down to ~10 and ~280 μJy, respectively, in the SWIRE/XMM-Newton/ELAIS-S1 field and...
A strong excess in the 20-100 keV emission of NGC 1365 (2009)
Risaliti, G., Braito, V., Laparola, V., Bianchi, S., Elvis, M., Fabbiano, G., ...
We present a new Suzaku observation of the obscured AGN in NGC 1365, revealing an unexpected excess of X-rays above 20 keV of at least a factor ~2 with respect to the extrapolation of the...
Castellano, M., Fontana, A., Boutsia, K., Grazian, A., Pentericci, L., Bouwens, R., ...
We perform a deep search for galaxies in the redshift range 6.5
Sacchi, N., La Franca, F., Feruglio, C., Fiore, F., Puccetti, S., Cocchia, F., ...
We present a catalog of optical spectroscopic identifications of sources detected by Spitzer at 3.6 or 24 micron down to 10 and 280 microJy, respectively, in the SWIRE/XMM-Newton/ELAIS-S1 field and...
Nardini, E., Risaliti, G., Salvati, M., Sani, E., Watabe, Y., Marconi, A., ...
We present a 5-8 micron analysis of the Spitzer-IRS spectra of 71 ultraluminous infrared galaxies (ULIRGs) with redshift z < 0.15, devoted to the study of the role of active galactic nuclei (AGN) and...
Marconi, A., Axon, D., Maiolino, R., Nagao, T., Pietrini, P., Risaliti, G., ...
The application of the virial theorem to the Broad Line Region of Active Galactic Nuclei allows Black Hole mass estimates for large samples of objects at all redshifts. In a recent paper we showed...
Strong [CII] emission at high redshift (2009)
Maiolino, R., Caselli, P., Nagao, T., Walmsley, M., De Breuck, C., Meneghetti, M.
We report the detection of the [CII]157.74um fine-structure line in the lensed galaxy BRI 0952-0115 at z=4.43, using the APEX telescope. This is the first detection of the [CII] line in a source with...
The evolution of the mass-metallicity relation in galaxies of different morphological types (2009)
Calura, F., Pipino, A., Chiappini, C., Matteucci, F., Maiolino, R.
By means of chemical evolution models for ellipticals, spirals and irregular galaxies, we aim at investigating the physical meaning and the redshift evolution of the mass-metallicity relation as well...
The Mass-Metallicity relation in galaxies of different morphological types (2009)
Calura, F., Pipino, A., Chiappini, C., Matteucci, F., Maiolino, R., Menci, N., ...
By means of chemical evolution models of different morphological types, we study the mass-metallicity (MZ) relation and its evolution with redshift. Our aim is to understand the role of galaxies of...
Early metal enrichment in high-redshift quasars (2009)
Quasars are powerful systems whose spectrum is rich of metal features that allow us to investigate the chemical evolution of galaxies at very high redshift, even close to the reionization epoch. I...
Vignali, C., Pozzi, F., Fritz, J., Comastri, A., Gruppioni, C., Bellocchi, E., ...
We present multi-wavelength observations (from optical to sub-millimeter, including Spitzer and SCUBA) of H2XMMJ 003357.2-120038 (also GD158_19), an X-ray selected, luminous narrow-line (Type 2)...
Mannucci, F., Cresci, G., Maiolino, R., Marconi, A., Pastorini, G., Pozzetti, L., ...
We present the first results of a project, LSD, aimed at obtaining spatially-resolved, near-infrared spectroscopy of a complete sample of Lyman-Break Galaxies at z~3. Deep observations with adaptive...
A Kiloparsec-Scale Hyper-Starburst in a Quasar Host Less than 1 Gigayear after the Big Bang (2009)
Walter, F., Riechers, D., Cox, P., Neri, R., Carilli, C., Bertoldi, F., ...
The host galaxy of the quasar SDSS J114816.64+525150.3 (at redshift z=6.42, when the Universe was
Schurer, A., Calura, F., Silva, L., Pipino, A., Granato, G. L., Matteucci, F., ...
We present photometric evolution models of galaxies, in which, in addition to the stellar component, the effects of an evolving dusty interstellar medium have been included with particular care....
The metallicity of the most distant quasars (2009)
Juarez, Y., Maiolino, R., Mujica, R., Pedani, M., Marinoni, S., Nagao, T., ...
We investigate the metallicity of the broad line region (BLR) of a sample of 30 quasars in the redshift range 4
Weighing black holes from zero to high redshift (2008)
Marconi, A., Axon, D., Maiolino, R., Nagao, T., Pietrini, P., Robinson, A., ...
The application of the virial theorem provides a tool to estimate supermassive black hole (BH) masses in large samples of active galactic nuclei (AGN) with broad emission lines at all redshifts and...
Berta, S., Rubele, S., Franceschini, A., Held, E. V., Rizzi, L., Rodighiero, G., ...
Context. The ESO-Spitzer Imaging extragalactic Survey (ESIS) is the optical follow up of the Spitzer Wide-area Infra-Red Extragalactic survey (SWIRE) in the ELAIS-S1 region of the sky. Aims. In the...
LSD and AMAZE: the mass-metallicity relation at z>3 (2008)
Mannucci, F., Maiolino, R., Collaboration, For The LSD, Collaboration, AMAZE
We present the first results on galaxy metallicity evolution at z>3 from two projects, LSD (Lyman-break galaxies Stellar populations and Dynamics) and AMAZE (Assessing the Mass Abundance redshift...
Berta, S., Rubele, S., Franceschini, A., Held, E., Rizzi, L., Rodighiero, G., ...
(abridged) The ESIS survey is the optical follow up of the SWIRE/Spitzer in the ELAIS-S1 region of the sky. In the era of observational cosmology, the main efforts are focused on the study of galaxy...
AMAZE. I. The evolution of the mass-metallicity relation at z>3 (2008)
Maiolino, R., Nagao, T., Grazian, A., Cocchia, F., Marconi, A., Mannucci, F., ...
We present initial results of an ESO-VLT large programme (AMAZE) aimed at determining the evolution of the mass-metallicity relation at z>3 by means of deep near-IR spectroscopy. Gas metallicities...
Prospects for AGN studies with ALMA (2008)
These lecture notes provide an introduction to mm/submm extragalactic astronomy, focused on AGN studies, with the final goal of preparing students to their future exploitation of the ALMA...
Star formation in the hosts of high-z QSOs: Evidence from Spitzer PAH detections (2008)
Lutz, D., Sturm, E., Tacconi, L. J., Valiante, E., Schweitzer, M., Netzer, H., ...
We present Spitzer rest-frame mid-infrared spectroscopy of twelve z~2 mm-bright type 1 QSOs, selected from unlensed and lensed QSO samples and covering a range of AGN optical luminosities...
L. Testi, F. D'Antona, F. Ghinassi, J. Licandro, A. Magazzu, R. Maiolino, ...
We present complete near-infrared (0.85--2.45 m), low-resolution (100) spectra of a sample of 26 disk L-dwarfs with reliable optical spectral type classification.
Risaliti, E. Nardini G., Salvati, M., Sani, E., Imanishi, M., Marconi, A., Maiolino, R.
We present an analysis of the 5-8 micron Spitzer-IRS spectra of a sample of 68 local Ultraluminous Infrared Galaxies (ULIRGs). Our diagnostic technique allows a clear separation of the active...
Star formation in the hosts of high-z QSOs: evidence from Spitzer PAH detections (2008)
Lutz, D., Sturm, E., Tacconi, L. J., Valiante, E., Schweitzer, M., Netzer, H., ...
The evolution of the mass-metallicity relation at z~3 (2007)
Maiolino, R., Nagao, T., Grazian, A., Cocchia, F., Marconi, A., Mannucci, F., ...
We present preliminary results of an ESO-VLT large programme (AMAZE) aimed at determining the evolution of the mass-metallicity relation at z~3 by means of deep near-IR spectroscopy. Gas...
The contribution of very massive high-redshift SWIRE galaxies to the stellar mass function (2007)
Berta, S., Lonsdale, C. J., Polletta, M., Savage, R. S., Franceschini, A., Buttery, H., ...
Context. In the last couple of years a population of very massive (M_* > 10^(11) M_⊙), high-redshift (z ≥ 2) galaxies has been identified, but its role in galaxy evolution has not yet been fully...
L. Hunt, L. Testi, S. Borelli, R. Maiolino, G. Moriondo
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L. Hunt, R. Maiolino, G. Moriondo
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Astronomy Astrophysics manuscript no. (2007)
Will Be Inserted, E. Oliva, A. Marconi, R. Maiolino, L. Testi, F. Mannucci, ...
We report 0.9-1.4 m spectroscopic observations of NGC1068 collected during the commissioning phase of the near infrared camera spectrometer (NICS) of the Telescopio Nazionale Galileo (TNG). These...
The Commissioning of the Arcetri (2007)
L. Hunt, R. Maiolino, G. Moriondo, L. Testi
This report is the second of a series that describes the data analysis and the quantitative results obtained with ARNICA. Our original intention was to limit this report to a description of...
The contribution of very massive high-redshift SWIRE galaxies to the stellar mass function (2007)
Berta, S., Lonsdale, C. J., Polletta, M., Savage, R. S., Franceschini, A., Buttery, H., ...
(Abridged) We selected high-z massive galaxies at 5.8 microns, in the SWIRE ELAIS-S1 field (1 sq. deg.). Galaxies with the 1.6 microns stellar peak redshifted into the IRAC bands (z~1-3, called...
3-5 micron spectroscopy of obscured AGNs in ULIRGs (2007)
Sani, E., Risaliti, G., Salvati, M., Maiolino, R., Marconi, A., Berta, S., ...
We present the results of infrared L-band (3-4 micron) and M-band (4-5 micron) VLT-ISAAC spectroscopy of five bright Ultraluminous InfraRed Galaxies (ULIRGs) hosting an AGN. From our analysis we...
Carilli, C. L., Neri, R., Wang, R., Cox, P., Bertoldi, F., Walter, F., ...
We have detected emission by the CO(5-4) and (6-5) rotational transitions at z = 5.7722 ± 0.0006 from the host galaxy of the SDSS quasar J0927+2001 using the Plateau de Bure Interferometer. The peak...
Molecular gas in QSO host galaxies at z>5 (2007)
Maiolino, R., Neri, R., Beelen, A., Bertoldi, F., Carilli, C. L., Caselli, P., ...
We present observations with the IRAM Plateau de Bure Interferometer of three QSOs at z>5 aimed at detecting molecular gas in their host galaxies as traced by CO transitions. CO (5-4) is detected in...
Carilli, C., Neri, R., Wang, R., Cox, P., Bertoldi, F., Walter, F., ...
We have detected emission by the CO 5-4 and 6-5 rotational transitions at $z = 5.7722\pm 0.0006$ from the host galaxy of the SDSS quasar J0927+2001 using the Plateau de Bure interferometer. The peak...
Le Floc'h, E., Willmer, C. N. A., Noeske, K., Konidaris, N. P., Laird, E. S., Koo, D. C., ...
As part of the All-Wavelength Extended Groth Strip International Survey (AEGIS), we describe the panchromatic characterization of an X-ray–luminous active galactic nucleus (AGN) in a merging galaxy...
Dust covering factor, silicate emission and star formation in luminous QSOs (2007)
Maiolino, R., Shemmer, O., Imanishi, M., Netzer, H., Oliva, E., Lutz, D., ...
We present Spitzer IRS low resolution, mid-IR spectra of a sample of 25 high luminosity QSOs at 2
The obscured X-ray source population in the HELLAS2XMM survey: the Spitzer view (2007)
Vignali, C., Pozzi, Francesca, Comastri, A., Pozzetti, L., Mignoli, M., Gruppioni, C., ...
Recent X-ray surveys have provided a large number of high-luminosity, obscured Active Galactic Nuclei (AGN), the so-called Type 2 quasars. Despite the large amount of multi-wavelength supporting...
Pozzi, F., Vignali, C., Comastri, A., Pozzetti, L., Mignoli, M., Gruppioni, C., ...
Aims: We aim at estimating the spectral energy distributions (SEDs) and the physical parameters related to the black holes harbored in eight high X-ray-to-optical (F_X/F_R>10) obscured quasars at...
PAH emission and star formation in the host of the z~2.56 Cloverleaf QSO (2007)
Lutz, D., Sturm, E., Tacconi, L. J., Valiante, E., Schweitzer, M., Netzer, H., ...
We report the first detection of the 6.2micron and 7.7micron infrared `PAH' emission features in the spectrum of a high redshift QSO, from the Spitzer-IRS spectrum of the Cloverleaf lensed QSO...
Dust properties at z=6.3 in the host galaxy of GRB 050904 (2007)
Stratta, G., Maiolino, R., Fiore, F., D'Elia, V.
We investigate the dust extinction properties in the host galaxy of the Gamma-Ray Burst (GRB) GRB 050904 at z=6.29 by analyzing simultaneous broad band observations of the optical and UV afterglow at...
Mannucci, F., Bonnoli, G., Zappacosta, L., Maiolino, R., Pedani, M.
We present the results of spectroscopic observations of galaxies associated with the diffuse X-ray emitting structure discovered by Zappacosta et al. (2002). After measuring the redshifts of 161...
X-ray absorption in Active Galactic Nuclei (2007)
We review some of the main physical and statistical properties of the X-ray absorber in AGNs. In particular, we review the distribution of the absorbing column density inferred from X-ray...
The HELLAS2XMM survey - VIII. Optical identifications of the extended sample (2007)
Cocchia, F., Fiore, F., Vignali, C., Mignoli, M., Brusa, M., Comastri, A., ...
PAH emission and star formation in the host of the z~2.56 cloverleaf QSO (2007)
Lutz, D., Sturm, E., Tacconi, L. J., Valiante, E., Schweitzer, M., Netzer, H., ...
Dust covering factor, silicate emission and star formation in luminous QSOs (2007)
Maiolino, R., Shemmer, O., Imanishi, M., Netzer, H., Oliva, E., Lutz, D., ...
The contribution of very massive high-redshift SWIRE galaxies to the stellar mass function (2007)
Berta, S., Lonsdale, C. J., Polletta, M., Savage, R. S., Franceschini, A., Buttery, H., ...
Molecular gas in QSO host galaxies at z > 5 (2007)
Maiolino, R., Neri, R., Beelen, A., Bertoldi, F., Carilli, C. L., Caselli, P., ...
We present observations with the IRAM Plateau de Bure Interferometer of three QSOs at z>5 aimed at detecting molecular gas in their host galaxies as traced by CO transitions. CO (5-4) is detected in...
Carilli, C. L., Neri, R., Wang, R., Cox, P., Bertoldi, F., Walter, F., ...
We have detected emission by the CO(5-4) and (6-5) rotational transitions at z=5.7722+/-0.0006 from the host galaxy of the SDSS quasar J0927+2001 using the Plateau de Bure Interferometer. The peak...
Arribas, S., Ferruit, P., Jakobsen, P., Boeker, T., Bunker, A., Charlot, S., ...
The Near Infrared Spectrograph (NIRSpec) on board of the James Webb Space Telescope (JWST) will be equipped with an Integral Field Unit (IFU) which will allow the two-dimensional spectral...
The HELLAS2XMM survey.VIII. Optical identifications of the extended sample (2006)
Cocchia, F., Fiore, F., Vignali, C., Mignoli, M., Brusa, M., Comastri, A., ...
(Abridged) We present the results of the photometric and spectroscopic identification of 110 hard X-ray selected sources (6e-15
A NICMOS search for obscured Supernovae in starburst galaxies (2006)
Cresci, G., Mannucci, F., Della Valle, M., Maiolino, R.
The detection of obscured supernovae (SNe) in near-infrared monitoring campaigns of starburst galaxies has shown that a significant fraction of SNe is missed by optical surveys. However, the number...
Floc'h, E. Le, Willmer, C. N. A., Noeske, K., Konidaris, N. P., Laird, E. S., Koo, D. C., ...
As part of the "All Wavelength Extended Groth Strip International Survey" (AEGIS), we describe the panchromatic characterization of an X-ray luminous active galactic nucleus (AGN) in a merging galaxy...
Evidence for strong evolution of the cosmic star formation density at high redshift (2006)
Mannucci, F., Buttery, H., Maiolino, R., Marconi, A., Pozzetti, L.
Deep HST/ACS and VLT/ISAAC data of the GOODS-South field were used to look for high-redshift galaxies in the rest-frame UV wavelength range and to study the evolution of the cosmic star-formation...
Metals and dust in high redshift AGNs (2006)
Maiolino, R., Nagao, T., Marconi, A., Schneider, R., Bianchi, S., Pedani, M., ...
We summarize some recent results on the metallicity and dust properties of Active Galactic Nuclei (AGN) at high redshift (1
The HELLAS2XMM survey: IX. Spectroscopic identification of super-EROs hosting AGNs (2006)
Maiolino, R., Mignoli, M., Pozzetti, L., Severgnini, P., Brusa, M., Vignali, C., ...
Local supermassive black holes and relics of active galactic nuclei (2006)
Marconi, A., Comastri, A., Gilli, R., Hasinger, G., Hunt, L. K., Maiolino, R., ...
Constraints on AGN unification from mid-infrared spectroscopy of a large sample of local AGN (2006)
Lutz, D., Sturm, E., Genzel, R., Spoon, H.W.W., Maiolino, R.
The double AGN in NGC 6240 revealed through 3-5 micron spectroscopy (2005)
Risaliti, G., Sani, E., Maiolino, R., Marconi, A., Berta, S., Braito, V., ...
We present 3-5 micron spectroscopy of the interacting system NGC 6240, showing the presence of two active galactic nuclei. The brightest (southern) nucleus shows up with a starburst-like emission,...
Unveiling the nature of Ultraluminous Infrared Galaxies with 3-4 micron spectroscopy (2005)
Risaliti, G., Maiolino, R., Marconi, A., Sani, E., Berta, S., Braito, V., ...
We present the results of L-band spectroscopical observations of local bright ULIRGs, performed with ISAAC at the VLT. We discuss the L-band spectral features of seven single sources, and the...
The HELLAS2XMM survey. IX. Spectroscopic identification of super-EROs hosting AGNs (2005)
Maiolino, R., Mignoli, M., Pozzetti, L., Severgnini, P., Brusa, M., Vignali, C., ...
We present VLT near-IR spectroscopic observations of three X-ray sources characterized by extremely high X-ray-to-optical ratios (X/O>40), extremely red colors (6.3
La Franca, F., Fiore, F., Comastri, A., Perola, G. C., Sacchi, N., Brusa, M., ...
We have determined the cosmological evolution of the density of AGN and of their Nh distribution as a function of the un-absorbed 2-10 keV luminosity up to redshift 4. We used the HELLAS2XMM sample...
First detection of [CII]158um at high redshift: vigorous star formation in the early universe (2005)
Maiolino, R., Cox, P., Caselli, P., Beelen, A., Bertoldi, F., Carilli, C. L., ...
We report the detection of the 2P_3/2 -> 2P_1/2 fine-structure line of C+ at 157.74 micron in SDSSJ114816.64+525150.3 (hereafter J1148+5251), the most distant known quasar, at z=6.42, using the IRAM...
A search for changing-look AGN in the Grossan catalog (2005)
Bianchi, S., Guainazzi, M., Matt, G., Chiaberge, M., Iwasawa, K., Fiore, F., ...
We observed with XMM-Newton 4 objects selected from the Grossan catalog, with the aim to search for new 'changing-look' AGN. The sample includes all the sources which showed in subsequent...
Improved Templates for Photometric Redshifts of Submm Sources (2005)
There is growing evidence that some star-forming galaxies at z>1 are characterized by high efficiencies and specific star formation rates. In the local universe, these traits are shared by ``active''...
A changing inner radius in the accretion disc of Q0056-363? (2005)
Matt, G., Porquet, D., Bianchi, S., Falocco, S., Maiolino, R., Reeves, J. N., ...
Q0056-363 is the most powerful X-ray quasar known to exhibit a broad, likely relativistic iron line (Porquet & Reeves 2003). It has been observed twice by XMM-$Newton$, three and half years apart...
Constraining the thermal history of the Warm-Hot Intergalactic Medium (2005)
Zappacosta, L., Maiolino, R., Finoguenov, A., Mannucci, F., Gilli, R., Ferrara, A.
We have identified a large-scale structure traced by galaxies at z=0.8, within the Lockman Hole, by means of multi-object spectroscopic observations. By using deep XMM images we have investigated the...
Warm-hot intergalactic medium in the Sculptor supercluster (2005)
Zappacosta, L., Maiolino, R., Mannucci, F., Gilli, R., Schuecker, P.
A changing inner radius in the accretion disc of Q0056-363? (2005)
Matt, G., Porquet, D., Bianchi, S., Falocco, S., Maiolino, R., Reeves, J. N., ...
Constraining the thermal history of the warm-hot intergalactic medium (2005)
Zappacosta, L., Maiolino, R., Finoguenov, A., Mannucci, F., Gilli, R., Ferrara, A.
Maiolino, R., Cox, P., Caselli, P., Beelen, A., Bertoldi, F., Carilli, C. L., ...
We report the detection of the 2P3/2 --> 2P1/2 fine-structure line of C+ at 157.74 mu m in SDSS J114816.64+525150.3 (hereafter J1148+5251), the most distant known quasar, at z=6.42, using the IRAM...
The supernova rate per unit mass (2004)
Mannucci, F., Della Valle, M., Panagia, N., Cappellaro, E., Cresci, G., Maiolino, R., ...
We compute the rate of supernovae (SNe) of different types along the Hubble sequence normalized to the near-infrared luminosity and to the stellar mass of the parent galaxies. This is made possible...
A supernova origin for dust in a high-redshift quasar (2004)
Maiolino, R., Schneider, R., Oliva, E., Bianchi, S., Ferrara, A., Mannucci, F., ...
Interstellar dust plays a crucial role in the evolution of the Universe by assisting the formation of molecules, by triggering the formation of the first low-mass stars, and by absorbing stellar...
Local Supermassive Black Holes and Relics of Active Galactic Nuclei (2004)
Marconi, A., Risaliti, G., Gilli, R., Hunt, L. K., Maiolino, R., Salvati, M.
We summarize a study where we test the hypothesis that local black holes (BH) are relics of AGN activity. We compare the mass function of BHs in the local universe with that expected from AGN relics,...
Nuclear star formation in the quasar PG1126-041 from adaptive optics assisted spectroscopy (2004)
Cresci, G., Maiolino, R., Marconi, A., Mannucci, F., Granato, G. L.
We present adaptive optics assisted spectroscopy of three quasars obtained with NACO at VLT. The high angular resolution achieved with the adaptive optics (~0.08"), joined to the diagnostic power of...
Shemmer, O., Netzer, H., Maiolino, R., Oliva, E., Croom, S., Corbett, E., ...
We present new near infrared spectroscopic measurements of the H_beta region for a sample of 29 luminous high redshift quasars. We have measured the width of H_beta in those sources, and added...
Netzer, H., Shemmer, O., Maiolino, R., Oliva, E., Croom, S., Corbett, E., ...
We present new near infrared spectroscopic measurements for 29 luminous high-z quasars and use the data to discuss the size and other properties of the NLRs in those sources. The high resolution...
The HELLAS2XMM survey: VI. X-ray absorption in the 1dfAGN sample through a spectral analysis (2004)
Perola, G. C., Puccetti, S., Fiore, F., Sacchi, N., Brusa, M., Cocchia, F., ...
The spectroscopic analysis of 117 serendipitous sources in the HELLAS2XMM 1df (1 degree field) survey is described. Of these, 106 sources, of which 86% have a spectroscopic redshift, are used to...
Warm-Hot Intergalactic Medium in the Sculptor Supercluster (2004)
Zappacosta, L., Maiolino, R., Mannucci, F., Gilli, R., Schuecker, P.
We have analyzed the soft X-ray emission in a wide area of the Sculptor supercluster by using overlapping ROSAT PSPC pointings. After subtraction of the point sources we have found evidence for...
Lutz, D., Maiolino, R., Spoon, H. W. W., Moorwood, A. F. M.
We use mid-infrared spectral decomposition to separate the 6micron mid-infrared AGN continuum from the host emission in the ISO low resolution spectra of 71 active galaxies and compare the results to...
Stellar and gaseous abundances in M82 (2004)
Origlia, L., Ranalli, P., Comastri, A., Maiolino, R.
The near infrared (IR) absorption spectra of starburst galaxies show several atomic and molecular lines from red supergiants which can be used to infer reliable stellar abundances. The metals locked...
The HELLAS2XMM survey. V. Near-Infrared observations of X-ray sources with extreme X/O ratios (2004)
Mignoli, M., Pozzetti, L., Comastri, A., Brusa, M., Ciliegi, P., Cocchia, F., ...
We present the results of deep near-infrared observations of 11 hard X-ray selected sources in the Hellas2XMM survey, with faint optical magnitude (R>24) and high X-ray-to-optical flux ratio. All but...
Detections of Warm-Hot Intergalactic Medium (2004)
Zappacosta, L., Maiolino, R., Mannucci, F., Gilli, R., Finoguenov, A., Ferrara, A.
Several popular cosmological models predict that most of the baryonic mass in the local universe is located in filamentary and sheet-like structures associated with groups and clusters of galaxies....
Extreme gas properties in the most distant quasars (2003)
Maiolino, R., Oliva, E., Ghinassi, F., Pedani, M., Mannucci, F., Mujica, R., ...
We present near-IR, low resolution spectra of eight of the most distant quasars known, with redshifts in the range 4.9
Obscuration and circumnuclear medium in nearby and distant AGN (2003)
Some recent results on the physical and statistical properties of nearby and distant AGN are presented. I first discuss the properties of "elusive" AGNs, i.e. obscured AGNs which do not show a...
Local Supermassive Black Holes, Relics of Active Galactic Nuclei and the X-ray Background (2003)
Marconi, A., Risaliti, G., Gilli, R., Hunt, L. K., Maiolino, R., Salvati, M.
We quantify the importance of mass accretion during AGN phases in the growth of supermassive black holes (BH) by comparing the mass function of black holes in the local universe with that expected...
The HELLAS2XMM 1dF survey: on the nature of high X-ray to optical flux ratio sources (2003)
Fiore, F., Brusa, M., Cocchia, F., Baldi, A., Carangelo, N., Ciliegi, P., ...
We present results from the photometric and spectroscopic identification of 122 X-ray sources discovered by XMM-Newton in the 2-10 keV band (the HELLAS2XMM 1dF sample). One of the most interesting...
The Infrared Supernova Rate (2003)
Mannucci, F., Cresci, G., Maiolino, R., Della Valle, M.
Optical searches can only detect supernovae with a limited amount of dust extinction. This is a severe limitation as most of the core-collapse SNe could explode inside dusty regions. We describe a...
Revealing the active galactic nucleus in the superantennae through L-band spectroscopy (2003)
Risaliti, G., Maiolino, R., Marconi, A., Bassani, L., Berta, S., Braito, V., ...
We present an L-band spectrum of the Ultraluminous Infrared Galaxy IRAS 19254-7245 (the Superantennae), obtained with VLT-ISAAC. The high signal to noise ratio allows a study of the main spectral...
Elusive Active Galactic Nuclei (2003)
Maiolino, R., Comastri, A., Gilli, R., Nagar, N. M., Bianchi, S., Boeker, T., ...
A fraction of active galactic nuclei do not show the classical Seyfert-type signatures in their optical spectra, i.e. they are optically "elusive". X-ray observations are an optimal tool to identify...
Brusa, M., Comastri, A., Mignoli, M., Fiore, F., Ciliegi, P., Vignali, C., ...
We present extensive optical, radio and infrared follow-up observations of a sample of 35 hard X-ray (2-10 keV) selected sources discovered serendipitously in the PV XMM-Newton observation of the...
Early star formation traced by the highest redshift quasars (2003)
Maiolino, R., Juarez, Y., Mujica, R., Nagar, N., Oliva, E.
The iron abundance relative to alpha-elements in the circumnuclear region of quasars is regarded as a clock of the star formation history and, more specifically, of the enrichment by SNIa. We...
Fiore, F., Brusa, M., Cocchia, F., Baldi, A., Carangelo, N., Ciliegi, P., ...
We present results from the photometric and spectroscopic identification of 122 X-ray sources recently discovered by XMM-Newton in the 2-10 keV band (the HELLAS2XMM 1dF sample). Their flux cover the...
The infrared supernova rate in starburst galaxies (2003)
Mannucci, F., Maiolino, R., Cresci, G., Della Valle, M., Vanzi, L., Ghinassi, F., ...
We report the results of our ongoing search for extincted supernovae (SNe) at near-infrared wavelengths. We have monitored at 2.2 micron a sample of 46 Luminous Infrared Galaxies and detected 4 SNe....
Changing look: from Compton-thick to Compton-thin, or the re-birth of fossil AGN (2003)
Matt, G., Guainazzi, M., Maiolino, R.
We discuss the properties of a small sample of Seyfert 2 galaxies whose X-ray spectrum changed appearance on time scales of years, becoming reflection-dominated from Compton-thin, or viceversa. A...
Nagar, N. M., Wilson, A. S., Falcke, H., Veilleux, S., Maiolino, R.
This paper presents the results of a high resolution radio imaging survey of 83 of the 118 ultraluminous infrared galaxies (ULIRGs) in the IRAS 1 Jy ULIRG sample. We have observed these ULIRGs at 15...
Lutz, D., Maiolino, R., Moorwood, A. F. M., Netzer, H., Wagner, S. J., Sturm, E., ...
The state of the matter that is obscuring a small circumnuclear region in AGN can be probed by observations of its broad emission lines. Infrared lines are particularly useful since they penetrate...
Warm-hot intergalactic baryons revealed (2002)
Zappacosta, L., Mannucci, F., Maiolino, R., Gilli, R., Ferrara, A., Finoguenov, A., ...
Several popular cosmological models predict that most of the baryonic mass in the local universe is located in filamentary and sheet-like structures associated with galaxy overdensities. This gas is...
Nagar, N. M., Oliva, E., Marconi, A., Maiolino, R.
This letter presents incontrovertible evidence that NGC5506 is a Narrow Line Seyfert 1 (NLSy1). Our new 0.9-1.4 micron spectrum of its nucleus clearly shows the permitted OI 1.1287 micron line (with...
Discovery of two infrared supernovae: a new window on the SN search (2002)
Maiolino, R., Vanzi, L., Mannucci, F., Cresci, G., Ghinassi, F., Della Valle, M.
We report the discovery of two supernovae (SN 1999gw and SN 2001db) obtained within the framework of an infrared monitoring campaign of Luminous Infrared Galaxies, aimed at detecting obscured...
On the nature of X-ray Bright Optically Normal galaxies (2002)
Comastri, A., Brusa, M., Ciliegi, P., Mignoli, M., Fiore, F., Maiolino, R., ...
Multiwavelength observations of the hard X-ray selected sources by Chandra and XMM-Newton surveys have significantly improved our knowledge of the objects responsible of the hard X-ray background. A...
Multi-wavelength Study of IRAS 19254-7245 - The Superantennae (2002)
Vanzi, L., Bagnulo, S., Floc'h, E. Le, Maiolino, R., Pompei, E., Walsh, W.
We present observations in the optical, near-infrared and millimetre bands of the Ultraluminous Infrared galaxy IRAS 19254-7245, also known as "The Superantennae". This galaxy is an interacting...
Comastri, A., Mignoli, M., Ciliegi, P., Severgnini, P., Maiolino, R., Brusa, M., ...
Recent X-ray surveys have clearly demonstrated that a population of optically dull, X-ray bright galaxies is emerging at 2-10 keV fluxes of the order of 10^{-14} erg cm^{-2} s^{-1}. Although they...
Lutz, D., Maiolino, R., Moorwood, A. F. M., Netzer, H., Wagner, S. J., Sturm, E., ...
The state of the matter that is obscuring a small circumnuclear region in active galactic nuclei can be probed by observations of its broad emission lines. Infrared lines are particularly useful...
Warm-hot intergalactic baryons revealed (2002)
Zappacosta, L., Mannucci, F., Maiolino, R., Gilli, R., Ferrara, A., Finoguenov, A., ...
Several popular cosmological models predict that most of the baryonic mass in the local universe is located in filamentary and sheet-like structures associated with galaxy overdensities. This gas is...
The TNG Near Infrared Camera Spectrometer (2001)
Baffa, C., Comoretto, G., Gennari, S., Lisi, F., Oliva, E., Biliotti, V., ...
NICS (acronym for Near Infrared Camera Spectrometer) is the near-infrared cooled camera-spectrometer that has been developed by the Arcetri Infrared Group at the Arcetri Astrophysical Observatory, in...
Optical identification of sources from the HELLAS2XMM survey (2001)
Fiore, F., Matt, G., La Franca, F., Perola, G. C., Brusa, M., Comastri, A., ...
We present preliminary results on the optical identifications of sources from the High Energy Large Area Survey performed with XMM-Newton (HELLAS2XMM). This survey covers about 3 square degrees of...
X-ray bright optically quiet galaxies: the case of P3 (2001)
Comastri, A., Brusa, M., Ciliegi, P., Mignoli, M., Vignali, C., Severgnini, P., ...
Recent X-ray surveys have clearly demonstrated that a population of optically dull, X-ray bright galaxies is emerging at X-ray fluxes of the order of 10-14 erg cm-2 s-1. The nature of these objects...
The Ly-edge paradox and the need for obscured QSOs (2001)
Maiolino, R., Salvati, M., Marconi, A., Antonucci, R. R. J.
Based on the most recent QSO ultraviolet spectra, the covering factor of the clouds of the Broad Line Region (BLR) is about 30%, or larger. This value would imply that in at least 30% of the QSOs our...
Discovery of strong CIV absorption in the highest redshift quasar (2001)
Maiolino, R., Mannucci, F., Baffa, C., Gennari, S., Oliva, E.
We report the near-IR detection of a prominent CIV absorption in the rest-frame UV spectrum of the most distant known QSO, SDSS J104433.04-012502.2, at z=5.80. This QSO was recently observed with...
Testi, L., D'Antona, F., Ghinassi, F., Licandro, J., Magazzu', A., Maiolino, R., ...
We present complete near-infrared (0.85-2.45 um), low-resolution (~100) spectra of a sample of 26 disk L-dwarfs with reliable optical spectral type classification. The observations have been obtained...
Properties of the circumnuclear medium in Active Galactic Nuclei (2001)
Gilli, R., Risaliti, G., Severgnini, P., Maiolino, R., Marconi, A., Salvati, M.
We propose a classification scheme for the circumnuclear medium of AGNs based on their location in the A_V - N_H plane (related to dust absorption and gas absorption, respectively). We present...
A new population of soft X-ray weak quasars (2001)
Risaliti, G., Marconi, A., Maiolino, R., Salvati, M., Severgnini, P.
Quasars selected in optical surveys by means of their blue or UV excess are known to be strong emitters in the X-rays, except for Broad Absorption Line (BAL) objects. In this paper we study the X-ray...
Oliva, E., Marconi, A., Maiolino, R., Testi, L., Mannucci, F., Ghinassi, F., ...
We report 0.9-1.4 micron spectroscopic observations of NGC1068 collected during the commissioning phase of the near infrared camera spectrometer (NICS) of the Telescopio Nazionale Galileo (TNG)....
Astronomy Astrophysics NICS: The TNG Near Infrared Camera Spectrometer ⋆ (2001)
C. Baffa, G. Comoretto, S. Gennari, F. Lisi, E. Oliva, V. Biliotti, ...
Abstract. NICS (the Near Infrared Camera Spectrometer) is a cooled near-infrared camera–spectrometer that has been developed by the Arcetri Infrared Group at the Arcetri Astrophysical Observatory,...
An X-ray and Near-IR spectroscopic analysis of the ULIRG IRAS 05189-2524 (2000)
Severgnini, P., Risaliti, G., Marconi, A., Maiolino, R., Salvati, M.
We present new, quasi-simultaneous hard X-ray and near-IR spectra of the ultraluminous infrared galaxy IRAS 05189-2524, and discuss them together with archival and literature data. The 1.9 Seyfert...
N-band Imaging of Seyfert Nuclei and the MIR-X-ray correlation (2000)
Krabbe, Alfred, Boeker, Torsten, Maiolino, R.
We present new mid-infrared (N-band) images of a sample of eight nearby Seyfert galaxies. In all of our targets, we detect a central unresolved source, which in some cases has been identified for the...
Dust in active nuclei. II. Powder or gravel? (2000)
Maiolino, R., Marconi, A., Oliva, E.
In a companion paper, Maiolino et al. (2000) presented various observational evidences for "anomalous" dust properties in the circumnuclear region of AGNs and, in particular, the reduced E(B-V)/N_H...
Dust in active nuclei. I. Evidence for "anomalous" properties (2000)
Maiolino, R., Marconi, A., Salvati, M., Risaliti, G., Severgnini, P., La Franca, F., ...
We present observational evidences that dust in the circumnuclear region of AGNs has different properties than in the Galactic diffuse interstellar medium. By comparing the reddening of optical and...
Obscured Active Galactic Nuclei (2000)
The properties of the absorption in type 2, narrow line AGNs are reviewed by focusing on the X-ray indicators. I discuss the properties of the cold absorbing medium (the putative torus) and of the...
The BeppoSAX HELLAS survey: on the nature of faint hard X-ray selected sources (2000)
Fiore, F., Antonelli, L. A., Ciliegi, P., Comastri, A., Giommi, P., La Franca, F., ...
The BeppoSAX 4.5-10 keV High Energy Large Area Survey has covered about 80 square degrees of sky down to a flux of F(5-10keV)~5E-14 cgs. Optical spectroscopic identification of about half of the...
Sub-mm and X-ray background: two unrelated phenomena? (2000)
Severgnini, P., Maiolino, R., Salvati, M., Axon, D., Cimatti, A., Fiore, F., ...
Obscured AGNs are thought to contribute a large fraction of the hard X-ray background (2-10 keV), and have also been proposed as the powerhouse of a fraction of the SCUBA sources which make most of...
Optically dim counterparts of hard X-ray selected AGNs (2000)
Maiolino, R., Salvati, M., Antonelli, L. A., Comastri, A., Fiore, F., Ghinassi, F., ...
We present near-IR photometry and imaging observations of a small sample of sources identified in the BeppoSAX 5-10 keV survey (HELLAS) which resolves ~ 20-30% of the X-ray background at these...
The hard X-ray emission of luminous infrared galaxies (2000)
Risaliti, G., Gilli, R., Maiolino, R., Salvati, M.
We present a study of the hard X-ray properties of a sample that includes all the Luminous Infrared Galaxies (LIGs, L_IR > 10^11 L_sun) observed in the 2-10 keV energy band (new and archival data)....
Optical, near-infrared and hard X-ray observations of SAXJ1353.9+1820: a red quasar (2000)
Vignali, C., Mignoli, M., Comastri, A., Maiolino, R., Fiore, F.
We present the results of a follow-up ASCA observation and multicolour optical and near-infrared photometry carried out at the 3.5-m Italian National Telescope Galileo of SAXJ1353.9+1820. This...
The Elusive Active Nucleus of NGC 4945 (2000)
Marconi, A., Oliva, E., Van Der Werf, P. P., Maiolino, R., Schreier, E. J., Macchetto, F., ...
We present new HST NICMOS observations of NGC 4945, a starburst galaxy hosting a highly obscured active nucleus that is one of the brightest extragalactic sources at 100 keV. The HST data are...
The hard X-ray properties of the Seyfert nucleus in NGC 1365 (2000)
Risaliti, G., Maiolino, R., Bassani, L.
We present BeppoSAX observations of the Seyfert 1.8 galaxy NGC1365 in the 0.1--100 keV range. The source was 6 times brighter than during an ASCA observation 3 years earlier. The 4--10 keV flux is...
Where are the type 2 AGNs? (2000)
Most of the energy of the X-ray background is contributed by sources with a hard X-ray spectrum, harder than the spectrum observed in nearby type 1 AGNs. The hard background contributors are...
The variability of the Seyfert galaxy NGC 2992: the case for a revived AGN (2000)
Gilli, R., Maiolino, R., Marconi, A., Risaliti, G., Dadina, M., Weaver, K. A., ...
We report the transition to an active state of the nucleus in the Seyfert 1.9 galaxy NGC 2992, discovered by means of new hard X-ray data. While the 2-10 keV flux declined by a factor of ~ 20 from...
The elusive active nucleus of NGC 4945 (2000)
Marconi, A., Oliva, E., Maiolino, R., Schreier, E.J., Macchetto, F., ...
The elusive active nucleus of NGC 4945 (2000)
Marconi, A., Oliva, E., Maiolino, R., Schreier, E.J., Macchetto, F., ...
Discovery of a nuclear gas bar feeding the active nucleus in Circinus (1999)
Maiolino, R., Alonso-Herrero, A., Anders, S., Quillen, A., Rieke, M. J., Rieke, G. H., ...
We report the discovery of gas inflow motions towards the active nucleus of the Circinus galaxy caused by the non-axisymmetric potential of a nuclear gas bar. Evidence for dust associated with the...
BeppoSAX unveils the nuclear component in NGC 6240 (1999)
Vignati, P., Molendi, S., Matt, G., Guainazzi, M., Antonelli, L. A., Bassani, L., ...
The direct nuclear X-ray emission of the ultraluminous IRAS galaxy NGC 6240 has been observed for the first time by BeppoSAX. It is seen through an absorber with N_H=2*10^{24} cm^{-2}. The 2-10 keV...
Oliva, E., Origlia, L., Maiolino, R., Moorwood, A. F. M.
High quality infrared spectra of active galaxies including the stellar absorption features of Si at 1.59 um, CO(6,3) at 1.62 um, and CO(2,0) at 2.29 um are used to measure the stellar mass to light...
Infrared 3D Observations of Nearby Active Galaxies (1999)
Maiolino, R., Thatte, N., Alonso-Herrero, A., Lutz, D., Marconi, A.
We present multi-wavelength imaging observations of three nearby and famous active galaxies obtained with NICMOS, ISOCAM and the MPE near-IR integral field spectrometer. The data reveal a variety of...
Soft X-ray spectroscopy of Compton-thick Seyfert 2 galaxies with BeppoSAX (1999)
Guainazzi, M., Matt, G., Antonelli, L. A., Bassani, L., Fabian, A. C., Maiolino, R., ...
We present a X-ray spectroscopic study of the bright Compton-thick Seyfert 2s NGC1068 and the Circinus Galaxy, performed with BeppoSAX. Matt et al. (1997 and 1998) interpreted the spectrum above 4...
The distribution of absorbing column densities among Seyfert 2 galaxies (1999)
Risaliti, G., Maiolino, R., Salvati, M.
We use hard X-ray data for an "optimal" sample of Seyfert 2 galaxies to derive the distribution of the gaseous absorbing column densities among obscured active nuclei in the local Universe. Of all...
BeppoSAX observations of Mkn 3: Piercing through the torus of a Seyfert 2 galaxy (1999)
Cappi, M., Bassani, L., Comastri, A., Guainazzi, M., Maccacaro, T., Malaguti, G., ...
A new BeppoSAX broad-band (0.6-150 keV) spectrum of the Seyfert 2 galaxy Mkn 3 is presented. The spectrum provides a direct measurement of a large, neutral column of gas with Nh~10**24 cm**-2 in the...
BeppoSAX uncovers the hidden Seyfert 1 nucleus in the Seyfert 2 galaxy NGC 2110 (1999)
Malaguti, G., Bassani, L., Cappi, M., Comastri, A., DiCocco, G., Fabian, A. C., ...
The Seyfert 2 galaxy NGC 2110 has been observed with BeppoSAX between 0.5 and 150 keV. The high energy instrument onboard, PDS, has succeeded in measuring for the first time the spectrum of this...
Matt, G., Guainazzi, M., Maiolino, R., Molendi, S., Perola, G. C., Antonelli, L. A., ...
The Circinus Galaxy has been observed, for the first time above 10 keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1--10 keV spectrum is apparent in the PDS data. The...
The effect of bars on the obscuration of active nuclei (1998)
Maiolino, R., Risaliti, G., Salvati, M.
We present evidence for a strong correlation between the gaseous absorbing column density towards type 2 Seyfert nuclei and the presence of a stellar bar in their host galaxies. Strongly barred...
Bassani, L., Dadina, M., Maiolino, R., Salvati, M., Risaliti, G., Della Ceca, R., ...
We present and discuss a "3-dimensional" diagnostic diagram for Seyfert2 galaxies obtained by means of X-ray and [OIII] data on a large sample of objects (reported in the Appendix). The diagram shows...
Bassani, L., Cappi, M., Malaguti, G., Palumbo, G. G. C., Dadina, M., Comastri, A., ...
We report broad band (0.1-200 keV) X-ray observations, made by BeppoSAX, of a sample of bright Seyfert 2 galaxies: NGC7172, NGC2110, NGC4507, Mkn 3 and NGC7674. These spectra provide a better...
Heavy obscuration in X-ray weak AGNs (1998)
Maiolino, R., Salvati, M., Bassani, L., Dadina, M., Della Ceca, R., Matt, G., ...
We present observations in the 0.1-100 keV spectral band of 8 Seyfert 2 galaxies, obtained by means of BeppoSAX. These sources were selected according to their [OIII] optical emission line flux, to...
Seyfert Activity and Nuclear Star Formation in the Circinus Galaxy (1997)
Maiolino, R., Krabbe, A., Thatte, N., Genzel, R.
We present high angular resolution (0".15-0".5) near infrared images and spectroscopy of the Circinus galaxy, the closest Seyfert 2 galaxy known. The data reveal a non-stellar nuclear source at 2.2...
Hard X--ray detection of NGC 1068 with BeppoSAX (1997)
Matt, G., Guainazzi, M., Frontera, F., Bassani, L., Brandt, W. N., Fabian, A. C., ...
We report on the first detection above ~10 keV of the archetypal Compton-thick Seyfert 2 galaxy NGC 1068. This detection, obtained with the PDS instrument onboard BeppoSAX in the 20-100 keV range,...
X-ray detections of weak Seyfert2's with BeppoSAX (1997)
Salvati, M., Bassani, L., Della Ceca, R., Maiolino, R., Matt, G., Zamorani, G.
We report the detection in the X rays of two weak Seyfert2's (NGC3393 and NGC4941) with the Italian-Dutch satellite BeppoSAX. These are among the first sources observed in a sample of 12 Seyfert2's...
ARNICA, the Arcetri near-infrared camera: astronomical performance assessment (1995)
L. K. Hunt, F. Lisi, L. Testi, C. Baffa, S. Borelli, R. Maiolino, ...
. The Arcetri near-infrared camera ARNICA was built as a users' instrument for the Infrared Telescope at Gornergrat (TIRGO), and is based on a 256\Theta256 NICMOS 3 detector. In this paper, we...