Grocholski, Aaron J., Aloisi, Alessandra, Van Der Marel, Roeland P., Mack, Jennifer, Annibali, Francesca, Angeretti, Luca, ...
We present deep HST ACS/WFC photometry of the dwarf irregular galaxy NGC 1569, one of the closest and strongest nearby starburst galaxies. These data allow us, for the first time, to unequivocally...
Rates, Progenitors and Cosmic Mix of Type Ia Supernovae (2008)
Greggio, Laura, Renzini, Alvio, Daddi, Emanuele
Following an episode of star formation, Type Ia supernova events occur over an extended period of time, following a distribution of delay times (DDT). We critically discuss some empirically-based DDT...
Supernova progenitors and iron density evolution from SN rate evolution measurements (2008)
Blanc, Guillaume, Greggio, Laura
Using an extensive compilation of literature supernova rate data we study to which extent its evolution constrains the star formation history, the distribution of the type Ia supernova (SNIa)...
Thomas H. Puzia, Roberto P. Saglia, Markus Kissler-patig, Claudia Maraston, Laura Greggio, Alvio Renzini, ...
Abstract. We present a comprehensive spectroscopic study of the integrated light of metal-rich Galactic globular clusters and the stellar population in the Galactic bulge. We measure line indices...
The evolution of the cosmic SN rate (2007)
Cappellaro, Enrico, Botticella, Maria Teresa, Greggio, Laura
We briefly review the contribution of SN rate measurements to the debate on SN progenitor scenarios. We find that core collapse rates confirms the rapid evolution of the star formation rate with...
ONIRICA: an infrared camera for OWL with MCAO low order partial correction (2006)
Ragazzoni, Roberto, Falomo, Renato, Arcidiacono, Carmelo, Diolaiti, Emiliano, Farinato, Jacopo, Lombini, Matteo, ...
ONIRICA, standing for OWL Near InfraRed Imaging Camera, is a pre-Phase A, conceptual design study to assess the feasibility of an imaging camera for a 100m class telescope. In this paper the main...
The rates of Type Ia Supernovae. I. Analytical Formulations (2005)
This paper provides a handy tool to compute the impact of Type Ia Supernova (SNIa) on the evolution of stellar systems. An effective formalism is presented to couple the SNIa rate to the star...
A straightforward formalism to evaluate the impact of Type Ia Supernovae on large scale astrophysical issues is presented, together with analytical formulations for the SNIa rate following an...
Greggio, Laura, Astrophysics Conference
Talk Abstract von Kongress: Star and Structure Formation: From First Light to the Milky Way, Astrophysics Conference, August 18-22, 2003, ETH Zurich, Switzerland
Due to their star formation history (SFH), the stellar population in Dwarf Galaxies (DG) is likely to have a metallicity spread which is best traced by the morphology of the Red Giant Branch (RGB)....
Puzia, Thomas H., Saglia, Roberto P., Kissler-Patig, Markus, Maraston, Claudia, Greggio, Laura, Renzini, Alvio, ...
We present a comprehensive spectroscopic study of the integrated light of metal-rich Galactic globular clusters and the stellar population in the Galactic bulge. We measure line indices which are...
The Oldest Stars of the Extremely Metal-Poor Local Group Dwarf Irregular Galaxy Leo A (2002)
Schulte-Ladbeck, Regina E., Hopp, Ulrich, Drozdovsky, Igor O., Greggio, Laura, Crone, Mary M.
We present deep Hubble Space Telescope single-star photometry of Leo A in B, V, and I. Our new field of view is offset from the centrally located field observed by Tolstoy et al. (1998) in order to...
Drozdovsky, Igor O., Schulte-Ladbeck, Regina E., Hopp, Ulrich, Greggio, Laura, Crone, Mary M.
We present the results of a detailed optical and near-IR study of the nearby star-forming dwarf galaxy NGC4214. We discuss the stellar content, drawing particular attention to the intermediate-age...
The Oldest Stars of the Extremely Metal-Poor Local Group Dwarf Irregular Galaxy Leo A (2002)
Igor O. Drozdovsky, Laura Greggio, München Frg, Mary M. Crone
We present deep Hubble Space Telescope single-star photometry of Leo A in B, V, and I. Our new field of view is o#set from the centrally located field observed by Tolstoy et al. (1998) in order to...
The Dwarf Irregular/Wolf-Rayet Galaxy NGC 4214: I. A New (2002)
Distance Stellar Content, Igor O. Drozdovsky, Laura Greggio, Mary M. Crone
We present the results of a detailed optical and near-IR study of the nearby star-forming dwarf galaxy NGC 4214. We discuss the stellar content, drawing particular attention to the intermediate-age...
The Star Formation History of the Blue Compact Dwarf Galaxy UGCA 290 (2001)
Crone, Mary M., Schulte-Ladbeck, Regina E., Greggio, Laura, Hopp, Ulrich
We present the star formation history of UGCA 290, a galaxy with properties intermediate between Blue Compact Dwarfs and Dwarf Irregulars. This galaxy is particularly interesting because its young...
The Stellar Content of NGC 6789, A Blue Compact Dwarf Galaxy in the Local Void (2001)
Drozdovsky, Igor O., Schulte-Ladbeck, Regina E., Hopp, Ulrich, Crone, Mary M., Greggio, Laura
We find that NGC6789 is the most nearby example of a Blue Compact Dwarf galaxy known to date. With the help of WFPC2 aboard the Hubble Space Telescope, we resolve NGC6789 into over 15,000 point...
A Near-Infrared Stellar Census of Blue Compact Dwarf Galaxies: The Wolf-Rayet Galaxy I Zw 36 (2001)
Schulte-Ladbeck, Regina E., Hopp, Ulrich, Greggio, Laura, Crone, Mary M., Drozdovsky, Igor O.
We report the results of near-IR imaging in J and H, of I Zw 36 ($\approx$Z$_{\odot}$/14) with the Hubble Space Telescope. Whereas imaging with the pre-COSTAR Faint Object Camera (FOC) previously...
The Cuspy LINER Nucleus of the S0/a Galaxy NGC 2681 (2000)
Cappellari, Michele, Bertola, Francesco, Burstein, David, Buson, Lucio M., Greggio, Laura, Renzini, Alvio
The nucleus of the bulge-dominated, multiply-barred S0/a galaxy NGC 2681 is studied in detail, using high resolution Hubble Space Telescope FOC and NICMOS imaging and FOS spectroscopy. The ionised...
A Compact Population of Red Giants in the Blue Compact Dwarf Galaxy UGCA 290 (2000)
Crone, Mary M., Schulte-Ladbeck, Regina E., Hopp, Ulrich, Greggio, Laura
We present HST/WFPC2 single-star photometry for the blue dwarf galaxy UGCA 290, whose morphology is intermediate between classic iE Blue Compact Dwarfs and blue dwarfs which exhibit no red background...
Schulte-Ladbeck, Regina E., Hopp, Ulrich, Greggio, Laura, Crone, Mary M.
We observed the Blue Compact Dwarf/Wolf-Rayet galaxy Mrk 178 with the NICMOS camera aboard HST. The galaxy is well resolved into individual stars in the near-IR; photometry in J and H yields...
Stellar yields and chemical evolution - The solar neighborhood as a calibrator (1999)
Thomas, Daniel, Greggio, Laura, Bender, Ralf
Uncertainties in stellar nucleosynthesis and their impact on models of chemical evolution are discussed. Comparing the Type II supernova nucleosynthesis prescriptions from Woosley & Weaver (1995) and...
A Near-Infrared Stellar Census of the Blue Compact Dwarf Galaxy VII~Zw~403 (1999)
Schulte-Ladbeck, Regina E., Hopp, Ulrich, Greggio, Laura, Crone, Mary M.
We present near-infrared single-star photometry for the low-metallicity Blue Compact Dwarf galaxy VII~Zw~403. We achieve limiting magnitudes of F110W~$\approx$~25.5 and F160W~$\approx$~24.5 using one...
The uncertainties in the synthetic indices for stellar populations (1999)
Maraston, Claudia, Greggio, Laura, Thomas, Daniel
The study of line strengths in the spectra of early-type galaxies has proven to be a powerful tool for investigating the age and the metallicity of these systems. When computing models for...
Schulte-Ladbeck, Regina E., Hopp, Ulrich, Crone, Mary M., Greggio, Laura
We present evidence for the existence of an old stellar halo in the Blue Compact Dwarf galaxy VII Zw 403. VII Zw 403 is the first Blue Compact Dwarf galaxy for which a clear spatial segregation of...
Central UV Spikes in two Galactic Spheroids (1999)
Cappellari, Michele, Bertola, Francesco, Burstein, David, Buson, Lucio M., Greggio, Laura, Renzini, Alvio
FOS spectra and FOC photometry of two centrally located, UV-bright spikes in the elliptical galaxy NGC 4552 and the bulge-dominated early spiral NGC 2681, are presented. These spectra reveal that...
Objects in NGC 205 Resolved into Stellar Associations by HST Ultraviolet Imaging (1999)
Cappellari, Michele, Bertola, Francesco, Burstein, David, Buson, Lucio M., Greggio, Laura, Renzini, Alvio
We have obtained high resolution UV images with the HST+WFPC2 of the central region of the dwarf elliptical galaxy NGC 205. Our images reveal that many of the hot UV stars previously detected and...
Hopp, Ulrich, Schulte-Ladbeck, Regina E., Greggio, Laura, Mehlert, Dorte
We present medium deep CCD imaging in B, V, and I of the Pegasus Dwarf galaxy (And VI) which was recently found by Karachentsev & Karachentseva (1998), and independently also by Armandroff et al....
The UV emission of elliptical galaxies (1998)
Greggio, Laura, Renzini, Alvio
Recent observational and theoretical developments concerning the origin of the ultraviolet emission from ellipticals are reviewed and discussed,with particular, reference to the extensive set of...
The Mini AGN at the Center of the Elliptical Galaxy NGC 4552 with HST (1998)
Cappellari, Michele, Renzini, Alvio, Greggio, Laura, Alighieri, Sperello Di Serego, Buson, Lucio M., Burstein, David, ...
The complex phenomenology shown by the UV-bright, variable spike first detected with the Hubble Space Telescope (HST) at the center of the otherwise normal galaxy NGC 4552 is further investigated...