Spectral Energy Distribution of Hyper-Luminous Infrared Galaxies (2010)
Ruiz, A., Miniutti, G., Panessa, F., Carrera, F. J.
The relationship between star formation and super-massive black hole growth is central to our understanding of galaxy formation and evolution. Hyper-Luminous Infrared Galaxies (HLIRGs) are unique...
A revision of the X-ray absorption nature of the BALQSOs (2010)
Streblyanska, A., Barcons, X., Carrera, F. J., Gil-Merino, R.
Broad absorption line quasars (BALQSOs) are key objects for studying the structure and emission/absorption properties of AGN. However, despite their fundamental importance, the properties of BALQSOs...
The XMM-Newton Wide Angle Survey (XWAS): the X-ray spectrum of type-1 AGN (2009)
Mateos, S., Carrera, F. J., Page, M. J., Watson, M. G., Corral, A., Tedds, J. A., ...
We discuss the broad band X-ray properties of one of the largest samples of X-ray selected type-1 AGN to date (487 objects in total), drawn from the XMM-Newton Wide Angle Survey. The objects cover...
Unabsorbed Seyfert 2 galaxies: the case of "naked" AGN (2009)
Panessa, F., Carrera, F. J., Bianchi, S., Corral, A., Gastaldello, F., Barcons, X., ...
Hawkins (2004) reported on a class of "naked" AGN characterized by strong amplitude optical brightness variability and the complete absence of broad emission lines in the optical spectrum. The...
Lamastra, A., Bianchi, S., Matt, G., Perola, G. C., Barcons, X., Carrera, F. J.
There have been recent claims that a significant fraction of type 2 AGN accrete close or even above the Eddington limit. In type 2 AGN the bolometric luminosity (L_b) is generally inferred from the...
High-precision multi-band measurements of the angular clustering of X-ray sources (2009)
Ebrero, J., Mateos, S., Stewart, G. C., Carrera, F. J., Watson, M. G.
In this paper we present the two-point angular correlation function of the X-ray source population of 1063 XMM-Newton observations at high Galactic latitudes, comprising up to ~30000 sources over a...
The XMM-Newton serendipitous survey - V. The second XMM-Newton serendipitous source catalogue (2009)
Watson, M. G., Schröder, A. C., Fyfe, D., Page, C. G., Lamer, G., Mateos, S., ...
The XMM-Newton Serendipitous Survey. VI. The X-ray Luminosity Function (2008)
Ebrero, J., Carrera, F. J., Page, M. J., Silverman, J. D., Barcons, X., Ceballos, M. T., ...
We present the X-ray luminosity function of AGN in three energy bands (Soft: 0.5-2 keV, Hard: 2-10 keV and Ultrahard: 4.5-7.5 keV). We have used the XMS survey along with other highly complete...
Average Fe K-alpha emission from distant AGN (2008)
Corral, A., Page, M. J., Carrera, F. J., Barcons, X., Mateos, S., Ebrero, J., ...
One of the most important parameters in the XRB (X-ray background) synthesis models is the average efficiency of accretion onto SMBH (super-massive black holes). This can be inferred from the shape...
An extreme EXO: a type 2 QSO at z=1.87 (2008)
Del Moro, A., Watson, M. G., Mateos, S., Akiyama, M., Hashimoto, Y., Tamura, N., ...
We aim to understand the multi-wavelength properties of 2XMM J123204+215255, the source with the most extreme X-ray-to-optical flux ratio amongst a sample of bright X-ray selected EXOs drawn from a...
High precision X-ray logN-logS distributions: implications for the obscured AGN population (2008)
Mateos, S., Warwick, R. S., Carrera, F. J., Stewart, G. C., Ebrero, J., Della Ceca, R., ...
We have constrained the extragalactic source count distributions over a broad range of X-ray fluxes and in various energy bands to test whether the predictions from X-ray background synthesis models...
The XMM-Newton Serendipitous Survey. V. The Second XMM-Newton Serendipitous Source Catalogue (2008)
Watson, M. G., Schröder, A. C., Fyfe, D., Page, C. G., Lamer, G., Mateos, S., ...
Aims: Pointed observations with XMM-Newton provide the basis for creating catalogues of X-ray sources detected serendipitously in each field. This paper describes the creation and characteristics of...
The cosmological properties of AGN in the XMM-Newton Hard Bright Survey (2008)
Della Ceca, R., Caccianiga, A., Severgnini, P., Maccacaro, T., Brunner, H., Carrera, F. J., ...
(ABRIDGED) We investigate here the XLF of absorbed (Nh between 4E21 and E24 cm-2) and unabsorbed (Nh < 4E21 cm-2) AGN, the fraction of absorbed AGN as a function of Lx (and z), the intrinsic Nh...
X-ray absorption in distant type II QSOs (2008)
Krumpe, M., Lamer, G., Corral, A., Schwope, A. D., Carrera, F. J., Barcons, X., ...
We present the results of the X-ray spectral analysis of an XMM-Newton-selected type II QSO sample with z>0.5 and 0.5-10 keV flux of 0.3-33 x 10^{-14} erg/s/cm^2. The distribution of absorbing column...
The XMM-Newton bright serendipitous survey: identification and optical spectral properties (2008)
Caccianiga, A., Severgnini, P., Della Ceca, R., Maccacaro, T., Cocchia, F., Barcons, X., ...
The cosmological properties of AGN in the XMM-Newton hard bright survey (2008)
Della Ceca, R., Caccianiga, A., Severgnini, P., Maccacaro, T., Brunner, H., Carrera, F. J., ...
identification of hard sources (2007)
J. P. D. Mittaz, F. J. Carrera
We have surveyed 188 ROSAT PSPC fields for X--ray sources with hard spectra (ff! 0:5); such sources must be major contributors to the X--ray background at faint fluxes. In this paper we present...
We show that binned differential luminosity functions constructed using the 1=V a method have a significant systematic error for objects close to their parent sample's flux limit(s). This is...
We present a catalogue of 147 serendipitous X--ray sources selected to have hard spectra (ff! 0:5) from a survey of 188 ROSAT fields. Such sources must be the dominant contributors to the X-ray...
W J. P. D. Mittaz, F. J. Carrera
We present a catalogue of 147 serendipitous X-ray sources selected to have hard spectra …a, 0:5 † from a survey of 188 ROSAT fields. Such sources must be the dominant contributors to the X-ray...
Soft X--ray spectral variations of the narrow line Seyfert 1 galaxy Markarian 766 (2007)
Page Carrera Mittaz, Galaxy Markarian, F. J. Carrera, J. P. D. Mittaz
The X--ray variability of the narrow line Seyfert 1 galaxy Markarian 766 is studied using 9 ROSAT PSPC datasets. The spectrum is well described by a power law combined with a blackbody (kT 70 eV)...
The Evolution of X--ray selected Narrow Emission Line Galaxies (2007)
Page Mason Hardy, K. O. Mason, L. R. Jones, F. J. Carrera
We examine the cosmological evolution of X--ray selected narrow emission line galaxies (NELGs), using a sample of 35 such objects identified in the combined ROSAT UK Deep survey and RIXOS. This...
An Improved Method of Constructing Binned Luminosity Functions (2007)
We show that binned differential luminosity functions constructed using the 1=V a method have a significant systematic error for objects close to their parent sample's flux limit(s). This is...
XMM-LSS survey: AGN classifications (Garcet+, 2007) (2007)
Garcet, O, Gandhi, P, Gosset, Eric, Sprimont, Pierre-Guillaume, Surdej, Jean, Borkowski, V, ...
We have used the most up-to-date X-ray catalog (Pierre et al., 2007, Cat. J/MNRAS/382/279) to define a sample of 612 X-ray selected point-like sources which have both a log-likelihood of detection...
NGC3147: a "true" Seyfert 2 without the broad-line region (2007)
Bianchi, S., Corral, A., Panessa, F., Barcons, X., Matt, G., Bassani, L., ...
We report on simultaneous optical and X-ray observations of the Seyfert galaxy, NGC3147. The XMM-Newton spectrum shows that the source is unabsorbed in the X-rays ($N_H
The XMM-Newton bright serendipitous survey. Identification and optical spectral properties (2007)
Caccianiga, A., Severgnini, P., Della Ceca, R., Maccacaro, T., Cocchia, F., Barcons, X., ...
AIMS: We present the optical classification and redshift of 348 X-ray selected sources from the XMM-Newton Bright Serendipitous Survey (XBS) which contains a total of 400 objects (identification...
Barcons, X., Carrera, F. J., Ceballos, M. T., Page, M. J., Bussons-Gordo, J., Corral, A., ...
We present the XMM-Newton Medium sensitivity Survey (XMS), including a total of 318 X-ray sources found among the serendipitous content of 25 XMM-Newton target fields. The XMS comprises four largely...
Garcet, O., Gandhi, P., Gosset, E., Sprimont, P. G., Surdej, J., Borkowski, V., ...
Our goal is to characterize AGN populations by comparing their X-ray and optical classifications. We present a sample of 99 spectroscopically identified X-ray point sources in the XMM-LSS survey...
XMM-Newton observations of the Lockman Hole V: time variability of the brightest AGN (2007)
Mateos, S., Barcons, X., Carrera, F. J., Page, M. J., Ceballos, M. T., Hasinger, G., ...
This paper presents the results of a study of X-ray spectral and flux variability on time scales from months to years, of the 123 brightest objects (including 46 type-1 AGN and 28 type-2 AGN)...
An XMM-Newton study of Hyper-Luminous Infrared Galaxies (2007)
Ruiz, A., Carrera, F. J., Panessa, F.
Hyper-Luminous Infrared Galaxies (HLIRGs) are the most luminous persistent objects in the Universe. They exhibit extremely high star formation rates, and most of them seem to harbour an AGN. They are...
Elusive AGN in the XMM-Newton bright serendipitous survey (2007)
Caccianiga, A., Severgnini, P., Della Ceca, R., Maccacaro, T., Carrera, F. J., Page, M. J.
AIMS: We investigate here the nature of all the sources (35 in total) in the XBS survey (which is 86% optically identified) showing an optical spectrum dominated by the light from the host galaxy...
The XMM-SSC survey of hard-spectrum XMM-Newton sources 1: optically bright sources (2007)
Page, M. J., Lehmann, I., Boller, Th., Watson, M. G., Dwelly, T., Hess, S., ...
We present optical and X-ray data for a sample of serendipitous XMM-Newton sources that are selected to have 0.5-2 keV vs 2-4.5 keV X-ray hardness ratios which are harder than the X-ray background....
The XMM-Newton serendipitous survey IV. The AXIS X-ray source counts and angular clustering (2007)
Carrera, F. J., Ebrero, J., Mateos, S., Ceballos, M. T., Corral, A., Barcons, X., ...
AXIS (An XMM-Newton International Survey) is a survey of 36 high Galactic latitude XMM-Newton observations covering 4.8 deg2 and containing 1433 serendipitous X-ray sources detected with 5-sigma...
The X-ray and Radio Connection in Low-luminosity Active Nuclei (2007)
Panessa, F., Barcons, X., Bassani, L., Cappi, M., Carrera, F. J., Ho, L. C., ...
We present the results of the correlation between the nuclear 2-10 keV X-ray and radio (at 2cm, 6cm and 20cm) luminosities for a well defined sample of local Seyfert galaxies. We use a sample of low...
The XMM-SSC survey of hard-spectrum XMM–Newton sources – I. Optically bright sources (2007)
Page, M. J., Lehmann, I., Boller, Th., Watson, M. G., Dwelly, T., Hess, S., ...
XMM-Newton observations of the Lockman Hole - V. Time variability of the brightest AGN (2007)
Mateos, S., Barcons, X., Carrera, F. J., Page, M. J., Ceballos, M. T., Hasinger, G., ...
Obscured and unobscured growth of supermassive black holes (2007)
A. Corral, F. J. Carrera, F. Panessa, J. Bussons, J. Ebrero, M. G. Watson, ...
Accretion is the dominant mechanism governing the growth of massive black holes in galaxy centers. Surveys at X-ray wavelengths trace the accretion history in the Universe and reveal that most of it...
Garcet, Olivier, Gandhi, P, Gosset, Eric, Sprimont, Pierre-Guillaume, Surdej, Jean, Borkowski, Virginie, ...
Aims.Our goal is to characterize AGN populations by comparing their X-ray and optical classifications within the framework of the standard orientation-based unified scheme. Methods: We present a...
Multi-wavelength and black hole mass properties of Low Luminosity Active Nuclei (2006)
Panessa, F., Bassani, L., Cappi, M., Dadina, M., Barcons, X., Carrera, F. J., ...
We investigate the relation between the X-ray nuclear emission, optical emission line, radio luminosity and black hole mass for a sample of nearby Seyfert galaxies. Strong linear correlations between...
Biased galaxy formation in the fields of high-redshift AGN (2006)
Stevens, J. A., Page, M. J., Carrera, F. J., Ivison, R. J., Smail, Ian
We discuss preliminary results from our programme to map the fields of high-redshift AGN. In the context of the hierarchical models such fields are predicted to contain an over-density of young,...
X-ray absorbed QSOs and the QSO evolutionary sequence (2006)
Page, M. J., Carrera, F. J., Ebrero, J., Stevens, J. A., Ivison, R. J.
Unexpected in the AGN unified scheme, there exists a population of broad-line z~2 QSOs which have heavily absorbed X-ray spectra. These objects constitute 10% of the population at luminosities and...
X-ray surveys with XMM-Newton and Chandra (2006)
X-ray surveys with XMM-Newton and Chandra
On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies (2006)
Panessa, F., Bassani, L., Cappi, M., Dadina, M., Barcons, X., Carrera, F. J., ...
We investigate the relation between X-ray nuclear emission, optical emission line luminosities and black hole masses for a sample of 47 Seyfert galaxies. The sample, which has been selected from the...
An X-ray bright ERO hosting a type 2 QSO (2006)
Severgnini, P., Caccianiga, A., Braito, V., Della Ceca, R., Maccacaro, T., Akiyama, M., ...
We present the XMM-Newton and the optical-VLT spectra along with the optical and the near-infrared photometric data of one of the brightest X-ray (F(2-10 keV)~1e-13 erg/s cm^2) extremely red objects...
On the X-ray, optical emission line and black hole mass properties of local Seyfert galaxies (2006)
Panessa, F., Bassani, L., Cappi, M., Dadina, M., Barcons, X., Carrera, F. J., ...
The nature of X-ray absorbed starburst QSOs and the QSO evolutionary scheme (2005)
Page, M. J., Carrera, F. J., Ebrero, J., Stevens, J. A., Ivison, R. J.
In contradiction to the simple AGN unification schemes, there exists a significant population of broad line, z~2 QSOs which have heavily absorbed X-ray spectra. These objects have luminosities and...
XMM-Newton observations of the Lockman Hole IV: spectra of the brightest AGN (2005)
Mateos, S., Barcons, X., Carrera, F. J., Ceballos, M. T., Hasinger, G., Lehmann, I., ...
This paper presents the results of a detailed X-ray spectral analysis of a sample of 123 X-ray sources (46 being type-1 AGN and 28 type-2 AGN) detected with XMM-Newton in the Lockman Hole field....
Submillimetre photometry of X-ray absorbed QSOs: their formation and evolutionary status (2005)
Stevens, J. A., Page, M. J., Ivison, R. J., Carrera, F. J., Mittaz, J. P. D., Smail, Ian, ...
We present an analysis of the submillimetre/X-ray properties of 19 X-ray absorbed, Compton-thin quasi-stellar objects (QSOs) selected to have luminosities and redshifts which represent the peak of...
Tentative detection of warm intervening gas towards PKS 0548-322 with XMM-Newton (2005)
Barcons, X., Paerels, F. B. S., Carrera, F. J., Ceballos, M. T., Sako, M.
We present the results of a long (~93 ksec) XMM-Newton observation of the bright BL-Lac object PKS 0548-322 (z=0.069). Our Reflection Grating Spectrometer (RGS) spectrum shows a single absorption...
XMM-Newton observations of the Lockman Hole IV: spectra of the brightest AGN (2005)
Mateos, S., Barcons, X., Carrera, F. J., Ceballos, M. T., Hasinger, G., Lehmann, I., ...
X-ray spectra of XMM-Newton serendipitous medium flux sources (2005)
Mateos, S., Barcons, X., Carrera, F.J., Ceballos, M.T., Caccianiga, A., Lamer, G., ...
XMM-Newton observations of the Lockman Hole IV: spectra of the brightest AGN (2005)
Mateos, S., Barcons, X., Carrera, F.J., Ceballos, M.T., Hasinger, G., Lehmann, I., ...
X-ray spectra of XMM-Newton serendipitous medium flux sources (2004)
Mateos, S., Barcons, X., Carrera, F. J., Ceballos, M. T., Caccianiga, A., Lamer, G., ...
We report on the results of a detailed analysis of the X-ray spectral properties of a large sample of sources detected serendipitously with the XMM-Newton observatory in 25 selected fields. The...
Simultaneous X-Ray and optical spectroscopy of the Seyfert galaxy Mrk 993 (2004)
Corral, A., Barcons, X., Carrera, F. J., Ceballos, M. T., Mateos, S.
We present the results of simultaneous XMM-Newton X-ray and 3.5m/CAHA optical spectroscopic observations of the Seyfert galaxy Mrk 993. This galaxy exhibited in the past significant variations of its...
The evolutionary sequence of active galactic nuclei and galaxy formation revealed (2004)
Page, M.J., Stevens, J.A., Ivison, J., Carrera, F.J.
Today, almost every galaxy spheroid contains a massive black hole: a remnant of, and testament to, a period in its evolution when it contained an active galactic nucleus (AGN). However, the sequence...
Exploring the X-ray Sky with the XMM-Newton Bright Serendipitous Survey (2004)
Della Ceca, R., Maccacaro, T., Caccianiga, A., Severgnini, P., Braito, V., Barcons, X., ...
ABRIDGED. We present "The XMM-Newton Bright Serendipitous Survey", two flux-limited samples with flux limit fx ~7E-14 cgs in the 0.5-4.5 keV (BSS) and 4.5-7.5 keV (HBSS) energy band, respectively....
The evolutionary sequence of active galactic nuclei and galaxy formation revealed (2004)
Page, M. J., Stevens, J. A., Ivison, R. J., Carrera, F. J.
Today, almost every galaxy spheroid contains a massive black hole: a remnant of, and testament to, a period in its evolution when it contained an active galactic nucleus (AGN). However, the sequence...
XMM-Newton spectra of hard spectrum Rosat AGN: X-ray absorption and optical reddening (2004)
Carrera, F. J., Page, M. J., Mittaz, J. P. D.
We present the XMM-Newton spectra of three low-redshift intermediate Seyferts (one Sy1.5, and two Sy1.8), from our survey of hard spectrum Rosat sources. The three AGN are well fitted by absorbed...
Stevens, J. A., Page, M. J., Ivison, R. J., Smail, Ian, Carrera, F. J.
The genesis of spheroids is central to our understanding of galaxy formation -- they are relatively simple systems, containing about half the stellar mass of the Universe. A major subset of...
Exploring the X-ray sky with the XMM-Newton bright serendipitous survey (2004)
Della Ceca, R., Maccacaro, T., Caccianiga, A., Severgnini, P., Braito, V., Barcons, X., ...
Exploring the X-ray sky with the XMM-Newton bright serendipitous survey (2004)
Della Ceca, R., Maccacaro, T., Caccianiga, A., Severgnini, P., Braito, V., Barcons, X., ...
Exploring the X-ray sky with the XMM Newton bright serendipitous survey (2004)
Della Ceca, R., Maccacaro, T., Caccianiga, A., Severgnini, P., Braito, V., Barcons, X., ...
First ten authors only listed.
The XMM-Newton HBS28 sample: studying the obscuration in hard X-ray selected AGNs (2003)
Caccianiga, A., Severgnini, P., Braito, V., Della Ceca, R., Maccacaro, T., Barcons, X., ...
This paper presents the analysis of a statistically complete sample of 28 serendipitous X-ray sources selected in 82 pointed XMM-Newton fields down to a count-rate of 0.002 counts s^-1(4.5-7.5 keV...
XMM-Newton observations expose AGN in apparently normal galaxies (2003)
Severgnini, P., Caccianiga, A., Braito, V., Della Ceca, R., Maccacaro, T., Wolter, A., ...
We have performed a detailed analysis of 3 optically normal galaxies extracted from the XMM Bright Serendipitous Source Sample. Thanks to the good statistics of the XMM-Newton data, we have unveiled...
The warm absorber of the Seyfert 1 galaxy H1419+480 (2003)
Barcons, X., Carrera, F. J., Ceballos, M. T.
The bright Seyfert 1 galaxy H1419+480 (z~0.072), whose X-ray colours from earlier HEAO-1 and ROSAT missions suggested a complex X-ray spectrum, has been observed with XMM-Newton. The EPIC spectrum...
On the origin of the X-ray emission from a narrow-line radioquasar at z>1 (2003)
Barcons, X., Carballo, R., Carrera, F. J., Ceballos, M. T., Gonzalez-Serrano, J. I., Paredes, J. M., ...
We present new XMM-Newton X-ray observations of the z=1.246 narrow-line radioquasar RX J1011.2+5545 serendipitously discovered by ROSAT. The flat X-ray spectrum previously measured by ROSAT and ASCA...
XMM-Newton observations reveal AGN in apparently normal galaxies (2003)
Severgnini, P., Caccianiga, A., Braito, V., Della Ceca, R., Maccacaro, T., Wolter, A., ...
XMM-Newton observations reveal AGN in apparently normal galaxies (2003)
Severgnini, P., Caccianiga, A., Braito, V., Della Ceca, R., Maccacaro, T., Wolter, A., ...
The XMM-Newton Survey Science Centre Medium Sensitivity Survey (2002)
Barcons, X., Carrera, F. J., Ceballos, M. T., Mateos, S., Page, M. J., Perez-Fournon, I., ...
We present preliminary results on the XMM-Newton Survey Science Centre medium sensitivity survey (XMS), with 0.5-4.5 keV flux limit 2 10^{-14} erg/cm2/s. At present, 19 fields have been examined with...
H1320+551: A Seyfert 1.8/1.9 galaxy with an unabsorbed X-ray spectrum (2002)
Barcons, X., Carrera, F. J., Ceballos, M. T.
We present new optical spectroscopic and XMM-Newton X-ray observations of the Active Galactic Nucleus H1320+551. The optical data (consistent with but of better quality than a previously published...
Submillimeter Evidence for the Coeval Growth of Massive Black Holes and Galaxy Bulges (2002)
Page, M. J., Stevens, J. A., Mittaz, J. P. D., Carrera, F. J.
The correlation, found in nearby galaxies, between black hole mass and stellar bulge mass implies that the formation of these two components must be related. Here we report submillimeter photometry...
Barcons, X., Carrera, F. J., Watson, M. G., McMahon, R. G., Aschenbach, B., Freyberg, M. J., ...
We present the first results on the identifications of a medium sensitivity survey (X-ray flux limit 2 x 10(-14) erg cm(-2) s(- 1) in the 0.5-4.5 keV band) at high galactic latitude (\b\ > 20degrees)...
Submillimeter evidence for the coeval growth of massive black holes and galaxy bulges (2001)
Page, M.J., Stevens, J.A., Mittaz, J.P.D., Carrera, F.J.
The correlation, found in nearby galaxies, between black hole mass and stellar bulge mass implies that the formation of these two components must be related. Here we report submillimeter photometry...
Barcons, X., Carrera, F. J., Watson, M. G., McMahon, R. G., Aschenbach, B., Freyberg, M. J., ...
We present the first results on the identifications of a medium sensitivity survey (X-ray flux limit 2E-14 erg/cm2/s in the 0.5-4.5 keV band) at high galactic latitude (|b|>20 deg) carried out with...
A survey of hard spectrum ROSAT sources - II. Optical identification of hard sources (2001)
Page, M.J., Mittaz, J.P.D., Carrera, F.J.
We have surveyed 188 ROSAT Position Sensitive Proportional Counter (PSPC) fields for X-ray sources with hard spectra (α
A survey of hard spectrum ROSAT sources 2: optical identification of hard sources (2001)
Page, M. J., Mittaz, J. P. D., Carrera, F. J.
We have surveyed 188 ROSAT PSPC fields for X-ray sources with hard spectra (alpha
Submillimeter Evidence for the Coeval Growth of Massive Black Holes and Galaxy Bulges. (2001)
Page, M.J., Stevens, J. A., Mittaz, J.P.D., Carrera, F.J.
Original article can be found at: http://www.sciencemag.org/cgi/content/full/294/5551/2516 Copyright American Association for the Advancement of Science. [Full text of this article is not available...
The variable XMM-Newton spectrum of Markarian 766 (2000)
Page, M. J., Mason, K. O., Carrera, F. J., Clavel, J., Kaastra, J. S., Puchnarewicz, E. M., ...
The narrow-line Seyfert 1 galaxy Markarian 766 was observed for 60 ks with the XMM-Newton observatory. The source shows a complex X-ray spectrum. The 2-10 keV spectrum can be adequately represented...
A survey of hard spectrum ROSAT sources 1: X-ray source catalogue (2000)
Page, M. J., Mittaz, J. P. D., Carrera, F. J.
We present a catalogue of 147 serendipitous X-ray sources selected to have hard spectra (alpha < 0.5) from a survey of 188 ROSAT fields. Such sources must be the dominant contributors to the X-ray...
ROSAC: Studying the clustering properties of X-ray selected AGNs (2000)
Tesch, F., Carrera, F. J., Engels, D., Hu, J., Ledoux, C., Ugryumov, A., ...
We present the first ROSAC results of an AGN clustering analysis. This study comprises a sample of 200 AGNs, 75% of which being at low redshifts z
X-ray sources as tracers of the large-scale structure in the Universe (2000)
Barcons, X., Carrera, F. J., Ceballos, M. T., Mateos, S.
We review the current status of studies of large-scale structure in the X-ray Universe. After motivating the use X-rays for cosmological purposes, we discuss the various approaches used on different...
Clustering in the X-ray Universe (2000)
Barcons, X., Carrera, F. J., Ceballos, M. T., Mateos, S.
In this paper we discuss various possibilities of using X-ray observations to gain information about the large-scale structure of the Universe. After reviewing briefly the current status of these...
An improved method of constructing binned luminosity functions (1999)
We show that binned differential luminosity functions constructed using the 1/Va method have a significant systematic error for objects close to their parent sample's flux limit(s). This is...
X-ray Spectra of the RIXOS source sample (1999)
Mittaz, J. P. D., Carrera, F. J., Romero-Colmenero, E., Mason, K. O., Hasinger, G., McMahon, R., ...
We present results of an extensive study of the X-ray spectral properties of sources detected in the RIXOS survey, that is nearly complete down to a flux limit of 3e-14 cgs (0.5-2 keV). We show that...
Soft X-ray spectral variations of the narrow line Seyfert 1 galaxy Markarian 766 (1999)
Page, M. J., Carrera, F. J., Mittaz, J. P. D., Mason, K. O.
The X-ray variability of the narrow line Seyfert 1 galaxy Markarian 766 is studied using 9 ROSAT PSPC datasets. The spectrum is well described by a power law combined with a blackbody (kT~ 70 eV)...
Clustering of X-ray selected Active Galactic Nuclei (1998)
Carrera, F. J., Barcons, X., Fabian, A. C., Hasinger, G., Mason, K. O., McMahon, R. G., ...
A total of 235 Active Galactic Nuclei (AGN) from two different soft X-ray surveys (the ROSAT Deep Survey -DRS- and the ROSAT International X-ray Optical Survey -RIXOS-) with redshifts between 0 and...
Optical and X-ray properties of the RIXOS AGN: II - Emission lines (1997)
Puchnarewicz, E. M., Mason, K. O., Carrera, F. J., Brandt, W. N., Cabrera-Guera, F., Carballo, R., ...
We present the optical and UV emission line properties of 160 X-ray selected AGN taken from the RIXOS survey (including Halpha, Hbeta, [OIII]5007, MgII2798 and CIII]1909). This sample is believed to...
Fluctuations in the diffuse X-ray background observed with Ginga (1997)
Butcher, J. A., Stewart, G. C., Warwick, R. S., Fabian, A. C., Carrera, F. J., Barcons, X., ...
We present Ginga measurements of the spatial fluctuations in the diffuse X-ray background. When combined with earlier results, the new data constrain the extragalactic log N - log S relation in the...
Barcons, X., Fabian, A. C., Carrera, F. J.
The precision of intensity measurements of the extragalactic X-ray Background (XRB) on an angular scale of about a degree is dominated by spatial fluctuations caused by source confusion noise. X-ray...
Soft X-ray background fluctuations and large-scale structure in the Universe (1996)
Carrera, F. J., Fabian, A. C., Barcons, X.
We have studied the fluctuations of the soft (0.9-2 keV) X-ray background intensity for ~10 arcmin and ~2 arcmin beam sizes, using 80 high galactic latitude medium-deep images from the ROSAT position...
Double-peaked Balmer line emission in the radio-quiet AGN RX J1042+1212 (1996)
Puchnarewicz, E. M., Mason, K. O., Carrera, F. J.
We present optical and X-ray spectra of a radio-quiet X-ray selected AGN, RX J1042+1212 ($z$=0.271). The Halpha and Hbeta emission lines are very broad (with full widths at half maximum of ~10000 km...
ROSAT PSPC spectra of X-ray selected Narrow Emission Line Galaxies (1996)
Romero-Colmenero, E., Branduardi-Raymont, G., Carrera, F. J., Jones, L. R., Mason, K. O., McHardy, I. M., ...
We analyse the ROSAT PSPC spectrum of 19 X-ray selected Narrow Emission Line Galaxies (NELGs) discovered during the optical identification of sources in the ROSAT UK Deep Survey. Their properties are...
Optical and X-ray properties of the RIXOS AGN: I - The continua (1996)
Puchnarewicz, E. M., Mason, K. O., Romero-Colmenero, E., Carrera, F. J., Hasinger, G., McMahon, R., ...
We present measurements of the optical and X-ray continua of 108 AGN (Seyfert 1s and quasars) from the Rosat International X-ray/Optical Survey (RIXOS). The sample covers a wide range in redshift (0
The Luminosity Function Evolution of Soft X--ray selected AGN in the RIXOS survey (1996)
Page, M. J., Carrera, F. J., Hasinger, G., Mason, K. O., McMahon, R., Mittaz, J. P. D., ...
A sample of 198 soft X--ray selected active galactic nuclei (AGN) from the ROSAT International X--ray Optical Survey (RIXOS), is used to investigate the X--ray luminosity function and its evolution....
The Deficit of Distant Galaxy Clusters in the RIXOS X-ray Survey (1995)
Castander, F. J., Bower, R. G., Ellis, R. S., Aragon-Salamanca, A., Mason, K. O., Hasinger, G., ...
Clusters of galaxies are the largest gravitationally bound systems and therefore provide an important way of studying the formation and evolution of the large scale structure of the Universe. Cluster...
Nearby Galaxies and the Ginga X-ray Background (1994)
Carrera, F. J., Barcons, X., Butcher, J. A., Fabian, A. C., Lahav, O., Stewart, G. C., ...
We present here the results of cross-correlating the X-ray background measured by Ginga in the 2-10 keV band with several catalogues of extragalactic objects. Positive signals with an amplitude of a...