The zCOSMOS 10k-Bright Spectroscopic Sample (2009)
Lilly, Simon J., Le Brun, Vincent, Maier, Christian, Mainieri, Vincenzo, Mignoli, Marco, Scodeggio, Marco, ...
We present spectroscopic redshifts of a large sample of galaxies with I_(AB) < 22.5 in the COSMOS field, measured from spectra of 10,644 objects that have been obtained in the first two years of...
The SINS Survey: Broad Emission Lines in High-Redshift Star-Forming Galaxies (2009)
Shapiro, Kristen L., Genzel, Reinhard, Quataert, Eliot, Förster Schreiber, Natascha M., Davies, Richard, Tacconi, Linda, ...
High signal-to-noise, representative spectra of star-forming galaxies at z ~ 2, obtained via stacking, reveal a high-velocity component underneath the narrow Hα and [NII] emission lines. When...
Deep Optical Photometry of Six Fields in the Andromeda Galaxy (2009)
Brown, Thomas M., Smith, Ed, Ferguson, Henry C., Guhathakurta, Puragra, Kalirai, Jason S., Kimble, Randy A., ...
Using the Advanced Camera for Surveys on the Hubble Space Telescope, we have obtained deep optical images reaching well below the oldest main sequence turnoff in six fields of the Andromeda Galaxy....
A Different Approach to Galaxy Evolution (2009)
The consequences are explored of an observationally established relation of the star formation rate (SFR) of star-forming galaxies with their stellar mass (M) and cosmic time (t), such that SFR is...
Journeying the Redshift Desert (2009)
Renzini, Alvio, Daddi, Emanuele
The cosmic star formation rate, AGN activity, galaxy growth, mass assembly and morphological differentiation all culminate at redshift $\sim 2$. Yet, the redshift interval $1.4\lsim z\lsim 3$ is...
The SINS Survey: Broad H-alpha Emission in High-Redshift Star-Forming Galaxies (2009)
Shapiro, Kristen L., Genzel, Reinhard, Quataert, Eliot, Schreiber, Natascha M. Förster, Davies, Richard, Tacconi, Linda, ...
High signal-to-noise, representative spectra of star-forming galaxies at z~2, obtained via stacking of the galaxies observed in the context of the SINS survey, reveal broad (FWHM > 1500 km/s) H-alpha...
The SINS survey: broad emission lines in high-redshift star-forming galaxies (2009)
Shapiro, Kristen L., Genzel, Reinhard, Quataert, Eliot, Förster Schreiber, Natascha M., Davies, Richard, Tacconi, Linda, ...
Stellar abundances tracing the formation of the galactic bulge (2009)
Barbuy, Beatriz, Zoccali, Manuela, Ortolani, Sergio, Hill, Vanessa, Renzini, Alvio, Meléndez, Jorge, ...
The WFC3 Galactic Bulge Treasury Program: A First Look at Resolved Stellar Population Tools (2008)
Brown, Thomas M., Sahu, Kailash, Zoccali, Manuela, Renzini, Alvio, Ferguson, Henry C., Anderson, Jay, ...
[Abridged] When WFC3 is installed on HST, the community will have powerful new tools for investigating resolved stellar populations. The WFC3 Galactic Bulge Treasury program will obtain deep imaging...
Stellar Proper Motions in the Galactic Bulge from deep HST ACS/WFC Photometry (2008)
Clarkson, Will, Sahu, Kailash, Anderson, Jay, Smith, T. Ed., Brown, Thomas M., Rich, R. Michael, ...
We present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS/WFC on HST. Proper motions are extracted for more than...
Origin of multiple stellar populations in globular clusters and their helium enrichment (2008)
The various scenarios proposed for the origin of the multiple, helium-enriched populations in massive globular clusters are critically compared to the relevant constraining observations. Among...
The Extended Star Formation History of the Andromeda Spheroid at 35 Kpc on the Minor Axis (2008)
Brown, Thomas M., Beaton, Rachael, Chiba, Masashi, Ferguson, Henry C., Gilbert, Karoline M., Guhathakurta, Puragra, ...
Using the HST ACS, we have obtained deep optical images reaching well below the oldest main sequence turnoff in fields on the southeast minor-axis of the Andromeda Galaxy, 35 kpc from the nucleus....
Shapiro, Kristen L., Genzel, Reinhard, Schreiber, Natascha M. Förster, Tacconi, Linda J., Bouché, Nicolas, Cresci, Giovanni, ...
We present a simple set of kinematic criteria that can distinguish between galaxies dominated by ordered rotational motion and those involved in major merger events. Our criteria are based on the...
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...
A spectroscopic study of a z=1.6 galaxy overdensity with GMASS (2008)
Kurk, Jaron, Cimatti, Andrea, Zamorani, Gianni, Halliday, Claire, Mignoli, Marco, Pozzetti, Lucia, ...
The Galaxy Mass Assembly ultra-deep Spectroscopic Survey samples a part of the CDFS to unprecedented depth. The resulting distribution of 150 z>1.4 redshifts reveals a significant peak at z=1.6, part...
Witnessing Galaxy-SMBH Co-Evolution at Redshift ~ 2 (2008)
Renzini, Alvio, Daddi, Emanuele
In a recent multiwavelength study of galaxies at redshift ~ 2 by Daddi et al. (2007a,b) it is shown that galaxies with a Mid-IR excess most likely harbor a Compton-thick AGN, thus bringing to about...
Seeking for the progenitors of type Ia supernovae (2008)
Patat, Ferdinando, Chandra, Poonam, Chevalier, Roger, Justham, Stephen, Podsiadlowski, Philipp, Wolf, Christian, ...
Shapiro, Kirsten L., Genzel, Reinhard, Förster Schreiber, Natascha M., Tacconi, Linda J., Bouché, Nicolas, Cresci, Giovanni, ...
Discovery of an evolved galaxy cluster at z > 2 (2008)
Onodera, Masato, Daddi, Emanuele, Kong, Xu, Arimoto, Nobuo, Renzini, Alvio, Brusa, Marcella, ...
A spectroscopic study of a z = 1.6 galaxy overdensity in the GMASS field (2008)
Kurk, Jaron, Cimatti, Andrea, Zamorani, Gianni, Halliday, Claire, Mignoli, Marco, Pozzetti, Lucia, ...
Planets in the Galactic Bulge: Results from the SWEEPS Project (2007)
Sahu, Kailash C., Casertano, Stefano, Valenti, Jeff, Bond, Howard E., Brown, Thomas M., Smith, T. Ed, ...
The exoplanets discovered so far have been mostly around relatively nearby and bright stars. As a result, the host stars are mostly (i) in the Galactic disk, (ii) relatively massive, and (iii)...
European Southern Observatory (2007)
Andrew W. Stephens, Jay A. Frogel, Sergio Ortolani, Roger Davies, Pascale Jablonka, ...
Based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by AURA for NASA under contract NAS5-26555. 2
The Initial Mass Function of the Galactic Bulge Down to (2007)
Manuela Zoccali Santi, Santi Cassisi, Jay A. Frogel, Andrew Gould, Sergio Ortolani, Alvio Renzini, ...
We present a luminosity function (LF) for lower main sequence stars in the Galactic bulge near (l; b) = (0 ffi ; \Gamma6 ffi ) to J = 24, corresponding to M J 9:3. This LF is derived from Hubble...
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 Rest-Frame UV Spectrum of Elliptical Galaxies at High Redshift (2007)
Beyond redshift ~1.4 the only spectral feature that allows one to get the redshift of passively evolving galaxies (PEG) with optical spectrographs is a characteristic structure due to a set of iron...
New HST Views at Old Stellar Systems (2007)
HST has recently revealed that many among the most massive globular clusters harbor multiple stellar populations, and --most surprisingly-- some of them are extremely helium rich. How these clusters...
Brown, Thomas M., Smith, Ed, Ferguson, Henry C., Guhathakurta, Puragra, Kalirai, Jasonjot S., Rich, R. Michael, ...
Using the HST ACS, we have obtained deep optical images of a southeast minor-axis field in the Andromeda Galaxy, 21 kpc from the nucleus. In both star counts and metallicity, this field represents a...
Very Massive Galaxies: A Challenge for Hierarchical Models? (2007)
Hierarchical models of galaxy formation now provide a much closer match to observations than they did a few years ago. The progress has been achieved by adjusting the description of baryonic...
Transiting extrasolar planetary candidates in the Galactic bulge (2006)
Sahu, Kailash C., Casertano, Stefano, Bond, Howard E., Valenti, Jeff, Smith, T. Ed, Minniti, Dante, ...
More than 200 extrasolar planets have been discovered around relatively nearby stars, primarily through the Doppler line shifts owing to the reflex motions of their host stars, and more recently...
Brown, Thomas M., Smith, Ed, Ferguson, Henry C., Rich, R. Michael, Guhathakurta, Puragra, Renzini, Alvio, ...
Using the Advanced Camera for Surveys on the Hubble Space Telescope, we have obtained deep optical images reaching stars well below the oldest main sequence turnoff in the spheroid, tidal stream, and...
Stellar Population Diagnostics of Elliptical Galaxy Formation (2006)
Major progress has been achieved in recent years in mapping the properties of passively-evolving, early-type galaxies (ETG) from the local universe all the way to redshift ~2. Here, age and...
The SINS survey: rotation curves and dynamical evolution of distant galaxies with SINFONI (2006)
Förster Schreiber, Natascha M., Genzel, Reinhard, Eisenhauer, Frank, Lehnert, Matthew D., Tacconi, Linda J., Nesvadba, Nicole, ...
Brown, Thomas M., Smith, Ed, Guhathakurta, Puragra, Rich, R. Michael, Ferguson, Henry C., Renzini, Alvio, ...
We present a color-magnitude diagram (CMD) for a field in the giant tidal stream of the Andromeda galaxy (M31). These observations, taken with the Advanced Camera for Surveys on the Hubble Space...
Stellar Cluster Fiducial Sequences with the Advanced Camera for Surveys (2005)
Brown, Thomas M., Ferguson, Henry C., Smith, Ed, Guhathakurta, Puragra, Kimble, Randy A., Sweigart, Allen V., ...
We present color-magnitude diagrams of five Galactic globular clusters and one Galactic open cluster spanning a wide range of metallicity (-2.1 < [Fe/H] < +0.3), as observed in the F606W (broad V)...
Steeper, Flatter, or Just "Salpeter"? Evidence from Galaxy Evolution and Galaxy Clusters (2004)
A single-slope "Salpeter" IMF overpredicts the stellar M/L ratio of local elliptical galaxies by about a factor of 2, which requires the IMF to be flatter below about one solar mass. On the other...
Age Constraints for an M31 Globular Cluster from Main Sequence Photometry (2004)
Brown, Thomas M., Ferguson, Henry C., Smith, Ed, Kimble, Randy A., Sweigart, Allen V., Renzini, Alvio, ...
We present a color-magnitude diagram (CMD) of the globular cluster SKHB-312 in the Andromeda galaxy (M31), obtained with the Advanced Camera for Surveys on the Hubble Space Telescope. The cluster was...
RR Lyrae Stars in the Andromeda Halo from Deep Imaging with the Advanced Camera for Surveys (2004)
Brown, Thomas M., Ferguson, Henry C., Smith, Ed, Kimble, Randy A., Sweigart, Allen V., Renzini, Alvio, ...
We present a complete census of RR Lyrae stars in a halo field of the Andromeda galaxy. These deep observations, taken as part of a program to measure the star formation history in the halo, spanned...
Recio-Blanco, Alejandra, Piotto, Giampaolo, Aparicio, Antonio, Renzini, Alvio
We present radial and rotation (v sini) velocity measurements, from UVES+VLT high resolution spectra of 61 stars in the blue horizontal branches (HB) of the Galactic globular clusters NGC 1904 (M79),...
Moustakas, Leonidas A., Casertano, Stefano, Conselice, Chris, Dickinson, Mark E., Eisenhardt, Peter, Ferguson, Henry C., ...
Using U'- through Ks-band imaging data in the GOODS-South field, we construct a large, complete sample of 275 ``extremely red objects'' (EROs; K_s3.35; AB), all with deep HST/ACS imaging in B_435,...
Somerville, Rachel S., Moustakas, Leonidas A., Mobasher, Bahram, Gardner, Jonathan P., Cimatti, Andrea, Conselice, Christopher, ...
The redshift distribution of near-IR selected galaxies is often used to attempt to discriminate between the classical view of galaxy formation, in which present-day luminous galaxies were assembled...
The Chemistry of Galaxy Clusters (2003)
From X-ray observations of galaxy clusters one derives the mass of the intracluster medium along with its chemical composition. Optical/infrared observations are used to estimate the mass of the...
Brown, Thomas M., Ferguson, Henry C., Smith, Ed, Kimble, Randy A., Sweigart, Allen V., Renzini, Alvio, ...
We present a color-magnitude diagram (CMD) for a minor-axis field in the halo of the Andromeda galaxy (M31), 51 arcmin (11 kpc) from the nucleus. These observations, taken with the Advanced Camera...
The Stellar Content of M31's Bulge (2003)
Stephens, Andrew W., Frogel, Jay A., DePoy, D. L., Freedman, Wendy, Gallart, Carme, Jablonka, Pascale, ...
In this paper we analyze the stellar populations present in M31 using nine sets of adjacent HST-NICMOS Camera 1 and 2 fields with galactocentric distances ranging from 2' to 20'. These infrared...
Far-Ultraviolet Emission from Elliptical Galaxies at z=0.33 (2003)
Brown, Thomas M., Ferguson, Henry C., Smith, Ed, Bowers, Charles W., Kimble, Randy A., Renzini, Alvio, ...
We present far-ultraviolet (far-UV) images of the rich galaxy cluster ZwCl1358.1+6245, taken with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope (HST). When combined...
Massive galaxies at high redshift from K20+GOODS Elektronische Daten (2003)
Renzini, Alvio, 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
Observations of faint galaxies with adaptive optics (2003)
Davies, Richard, Lehnert, Matthew, Baker, Andrew J., Thatte, Niranjan, Renzini, Alvio, Bonaccini, Domenico
Observations of faint galaxies with adaptive optics (2003)
Davies, Richard I., Lehnert, Matthew D., Baker, Andrew, Thatte, Niranjan A., Renzini, Alvio, Bonaccini, Domenico
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...
Future Opportunities for Globular Cluster Astronomy at Ground Based Facilities (2002)
In spite of great progress over the last $\sim 10$ years, especially thanks to HST, a number of exciting open problem still puzzle astronomers working on globular clusters in our own and other...
Recio-Blanco, Alejandra, Piotto, Giampaolo, Aparicio, Antonio, Renzini, Alvio
We present high resolution UVES+VLT spectroscopic observations of 56 stars in the extended horizontal branch (EHB) of the Galactic globular clusters NGC 1904, NGC 2808, NGC 6093, and NGC 7078. Our...
An Empirical View to the Early Chemical Evolution of Bulge/Disk Galaxies (2001)
Scaling from the empirical metal yield as measured in clusters of galaxies, it is inferred that early in the evolution of the Galaxy the bulge stellar population has produced $\sim 10^9\msun$ of...
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...
Stanghellini, Letizia, Renzini, Alvio
We explore the realm of post-Asymptotic Giant Branch (post-AGB) stars from a theoretical viewpoint, by constructing synthetic population of transition objects, proto-Planetary Nebulae, Planetary...
Supermassive Black Holes Can Hardly Be "Silent" (2000)
There is now ample evidence that most - perhaps all - galactic spheroids host a supermassive BH at their center. This has been assessed using a variety of observational techniques, from stellar...
WWhat Heavy Elements in Clusters of Galaxies Tell About Clusters and Galaxies (2000)
Clusters of galaxies allow a direct estimate of the metallicity and metal production yield on the largest scale so far. The ratio of the total iron mass in the ICM to the total optical luminosity of...
HST-NICMOS Color Transformations and Photometric Calibrations (1999)
Stephens, Andrew W., Frogel, Jay A., Ortolani, Sergio, Davies, Roger, Jablonka, Pascale, Renzini, Alvio, ...
This paper presents color transformations for HST NICMOS camera 2 observations to the ground-based CIT/CTIO photometric system, using observations of nineteen moderately bright, red stars in Baade's...
Chemical Evolution on the Scale of Clusters of Galaxies, and Beyond (1999)
Clusters of galaxies allow a direct estimate of the metallicity and metal production yield on the largest scale so far. The ratio of the total iron mass in the ICM to the total optical luminosity of...
Insight into the origin of bulges is saught in this review only from the properties of their stellar populations. Evidence concerning the age of the Galactic bulge stellar population is reviewed...
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...
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...
Hints on Galaxy Formation from the Metal Content of Galaxy Cluster and Other Fossil Evidence (1998)
Clusters of galaxies allow a direct estimate of the metallicity and metal production yield on the largest scale so far. It is argued that cluster metallicity ($\sim 1/3$ solar) should be taken as...
Cluster vs. Field Elliptical Galaxies and Clues on their Formation (1998)
Bernardi, Mariangela, Renzini, Alvio, Da Costa, Luiz N., Wegner, Gary, Alonso, M. Victoria, Pellegrini, Paulo S., ...
Using new observations for a sample of 931 early-type galaxies we investigate whether the \mg2--\so relation shows any dependence on the local environment. The galaxies have been assigned to three...
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...
The Stellar Populations of Pixels and Frames (1998)
Derived from first physical principles, a few simple rules are presented that can help in both the planning and interpretation of CCD and IR-array camera observations of resolvable stellar...
The Main Epoch of Metal Production in the Universe (1998)
Clusters of galaxies allow a direct estimate of the metallicity and metal production yield on the largest scale so far. It is argued that cluster metallicity (about 1/3 solar) should be taken as...
Iron as a tracer in galaxy clusters and groups (1997)
Available X-ray data are collected and organized concerning the iron and gas content of galaxy clusters and groups, together with the optical luminosity, mass and iron abundance of cluster galaxies....
Discovery of Extended Blue Horizontal Branches in Two Metal-Rich Globular Clusters (1997)
Rich, R. Michael, Sosin, Craig, Djorgovski, S. George, Piotto, Giampaolo, King, Ivan R., Renzini, Alvio, ...
We have used WFPC2 to construct B, V color-magnitude diagrams of four metal-rich globular clusters, NGC 104 (47 Tuc), NGC 5927, NGC 6388, and NGC 6441. All four clusters have well populated red...
Peculiar Multimodality on the Horizontal Branch of the Globular Cluster NGC 2808 (1997)
Sosin, Craig, Dorman, Ben, Djorgovski, S. George, Piotto, Giampaolo, Rich, R. Michael, King, Ivan R., ...
We present distributions of colors of stars along the horizontal branch of the globular cluster NGC 2808, from Hubble Space Telescope WFPC2 imaging in B, V, and an ultraviolet filter (F218W). This...
The Iron Discrepancy in Elliptical Galaxies after ASCA (1996)
Arimoto, Nobuo, Matsushita, Kyoko, Ishimaru, Yuhri, Ohashi, Takaya, Renzini, Alvio
We present estimates for the iron content of the stellar and diffused components of elliptical galaxies, as derived respectively from integrated optical spectra and from ASCA X-ray observations. A...
Renzini, Alvio, Bragaglia, Angela, Ferraro, Francesco R., Gilmozzi, Roberto, Ortolani, Sergio, Holberg, J. B., ...
Deep Hubble Space Telescope (HST) observations with WFPC2 of the nearby globular cluster NGC 6752 have allowed us to obtain accurate photometry for the cluster white dwarfs (WD). A sample of local...