Search Publications
Star Formation in AEGIS Field Galaxies since z=1.1: The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-forming Galaxies
Le Floc'h, E.; Barmby, P.; Cooper, M. C. +26 more
We analyze star formation (SF) as a function of stellar mass (M*) and redshift z in the All-Wavelength Extended Groth Strip International Survey. For 2905 field galaxies, complete to 1010(1010.8) Msolar at z<0.7(1), with Keck spectroscopic redshifts out to z=1.1, we compile SF rates (SFRs) from emissi…
The Cosmic Evolution Survey (COSMOS): Overview
Kneib, J. -P.; Aussel, H.; Sanders, D. B. +19 more
The Cosmic Evolution Survey (COSMOS) is designed to probe the correlated evolution of galaxies, star formation, active galactic nuclei (AGNs), and dark matter (DM) with large-scale structure (LSS) over the redshift range z>0.5-6. The survey includes multiwavelength imaging and spectroscopy from X-ray-to-radio wavelengths covering a 2 deg2<…
New Hubble Space Telescope Discoveries of Type Ia Supernovae at z >= 1: Narrowing Constraints on the Early Behavior of Dark Energy
Dickinson, Mark; Ferguson, Henry C.; Casertano, Stefano +18 more
We have discovered 21 new Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to trace the history of cosmic expansion over the last 10 billion yr. These objects, which include 13 spectroscopically confirmed SNe Ia at z>=1, were discovered during 14 epochs of reimaging of the GOODS fields North and South over 2 …
The reversal of the star formation-density relation in the distant universe
Daddi, E.; Elbaz, D.; Popesso, P. +11 more
Aims:We study the relationship between the local environment of galaxies and their star formation rate (SFR) in the Great Observatories Origins Deep Survey, GOODS, at z∼1.
Methods: We use ultradeep imaging at 24 µm with the MIPS camera onboard {Spitzer} to determine the contribution of obscured light to the SFR of galaxies over the redsh…
Galaxy Luminosity Functions to z~1 from DEEP2 and COMBO-17: Implications for Red Galaxy Formation
Im, M.; Cooper, M. C.; Wolf, C. +31 more
The DEEP2 and COMBO-17 surveys are compared to study luminosity functions of red and blue galaxies to z~1. The two surveys have different methods and sensitivities, but nevertheless results agree. After z~1, M*B has dimmed by 1.2-1.3 mag for all colors of galaxies, φ* for blue galaxies has hardly changed, and φ
zCOSMOS: A Large VLT/VIMOS Redshift Survey Covering 0 < z < 3 in the COSMOS Field
Smail, I.; Finoguenov, A.; Kneib, J. -P. +74 more
zCOSMOS is a large-redshift survey that is being undertaken in the COSMOS field using 600 hr of observation with the VIMOS spectrograph on the 8 m VLT. The survey is designed to characterize the environments of COSMOS galaxies from the 100 kpc scales of galaxy groups up to the 100 Mpc scale of the cosmic web and to produce diagnostic information o…
The Calibration of Mid-Infrared Star Formation Rate Indicators
Moustakas, J.; Roussel, H.; Leitherer, C. +25 more
With the goal of investigating the degree to which the MIR emission traces the SFR, we analyze Spitzer 8 and 24 µm data of star-forming regions in a sample of 33 nearby galaxies with available HST NICMOS images in the Paα (1.8756 µm) emission line. The galaxies are drawn from the SINGS sample and cover a range of morphologies and a fac…
The First Release COSMOS Optical and Near-IR Data and Catalog
Kneib, J. -P.; Aussel, H.; Sanders, D. B. +55 more
We present imaging data and photometry for the COSMOS survey in 15 photometric bands between 0.3 and 2.4 µm. These include data taken on the Subaru 8.3 m telescope, the KPNO and CTIO 4 m telescopes, and the CFHT 3.6 m telescope. Special techniques are used to ensure that the relative photometric calibration is better than 1% across the field…
The SAURON project - IX. A kinematic classification for early-type galaxies
Krajnović, Davor; Emsellem, Eric; van de Ven, Glenn +10 more
Two-dimensional stellar kinematics of 48 representative elliptical (E) and lenticular (S0) galaxies obtained with the SAURON integral-field spectrograph reveal that early-type galaxies appear in two broad flavours, depending on whether they exhibit clear large-scale rotation or not. We define a new parameter , which involves luminosity-weighted av…
A Triple Main Sequence in the Globular Cluster NGC 2808
Anderson, J.; Milone, A. P.; Bedin, L. R. +6 more
Accurate photometry with HST's ACS shows that the main sequence (MS) of the globular cluster NGC 2808 splits into three separate branches. The three MS branches may be associated with the complexities of the cluster's horizontal branch and of its abundance distribution. We attribute the MS branches to successive rounds of star formation, with diff…