Nearly 5000 Distant Early-Type Galaxies in COMBO-17: A Red Sequence and Its Evolution since z ~ 1
Eric F. Bell,Christian Wolf,Klaus Meisenheimer,Hans-Walter Rix,Andrea Borch,Simon Dye,M. Kleinheinrich,Lutz Wisotzki,Daniel H. McIntosh +8 more
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In this paper, the rest-frame colors and luminosities of 25,000 mR 24 galaxies in the redshift range 0.2 < z ≤ 1.1 drawn from the COMBO-17 survey (Classifying Objects by Medium-Band Observations in 17 Filters).Abstract:
We present the rest-frame colors and luminosities of ~25,000 mR 24 galaxies in the redshift range 0.2 < z ≤ 1.1 drawn from 0.78 deg2 of the COMBO-17 survey (Classifying Objects by Medium-Band Observations in 17 Filters). We find that the rest-frame color distribution of these galaxies is bimodal at all redshifts out to z ~ 1. This bimodality permits a model-independent definition of red early-type galaxies and blue late-type galaxies at any given redshift. The colors of the blue peak become redder toward the present day, and the number density of blue luminous galaxies has dropped strongly since z ~ 1. Focusing on the red galaxies, we find that they populate a color-magnitude relation. Such red sequences have been identified in galaxy cluster environments, but our data show that such a sequence exists over this redshift range even when averaging over all environments. The mean color of the red galaxy sequence evolves with redshift in a way that is consistent with the aging of an ancient stellar population. The rest-frame B-band luminosity density in red galaxies evolves only mildly with redshift in a Λ-dominated cold dark matter universe. When we account for the change in stellar mass-to-light ratio implied by the redshift evolution in red galaxy colors, the COMBO-17 data indicate an increase in stellar mass on the red sequence by a factor of 2 since z ~ 1. The largest source of uncertainty is large-scale structure, implying that considerably larger surveys are necessary to further refine this result. We explore mechanisms that may drive this evolution in the red galaxy population, finding that both galaxy merging and truncation of star formation in some fraction of the blue star-forming population are required to fully explain the properties of these galaxies.read more
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CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
Norman A. Grogin,Dale D. Kocevski,Sandra M. Faber,Henry C. Ferguson,Anton M. Koekemoer,Adam G. Riess,Viviana Acquaviva,David M. Alexander,Omar Almaini,Matthew L. N. Ashby,Marco Barden,Eric F. Bell,Frédéric Bournaud,Thomas M. Brown,Karina Caputi,Stefano Casertano,Paolo Cassata,Marco Castellano,Peter Challis,Ranga-Ram Chary,Edmond Cheung,Michele Cirasuolo,Christopher J. Conselice,Asantha Cooray,Darren J. Croton,Emanuele Daddi,Tomas Dahlen,Romeel Davé,Duilia F. de Mello,Duilia F. de Mello,Avishai Dekel,Mark Dickinson,Timothy Dolch,Jennifer L. Donley,James Dunlop,Aaron A. Dutton,David Elbaz,Giovanni G. Fazio,Alexei V. Filippenko,Steven L. Finkelstein,Adriano Fontana,Jonathan P. Gardner,Peter M. Garnavich,Eric Gawiser,Mauro Giavalisco,Andrea Grazian,Yicheng Guo,Nimish P. Hathi,Boris Häussler,Philip F. Hopkins,Jiasheng Huang,Kuang-Han Huang,Kuang-Han Huang,Saurabh Jha,Jeyhan S. Kartaltepe,Robert P. Kirshner,David C. Koo,Kamson Lai,Kyoung-Soo Lee,Weidong Li,Jennifer M. Lotz,Ray A. Lucas,Piero Madau,Patrick J. McCarthy,Elizabeth J. McGrath,Daniel H. McIntosh,Ross J. McLure,Bahram Mobasher,Leonidas A. Moustakas,Mark Mozena,Kirpal Nandra,Jeffrey A. Newman,Sami Niemi,Kai G. Noeske,Casey Papovich,Laura Pentericci,Alexandra Pope,Joel R. Primack,Abhijith Rajan,Swara Ravindranath,Naveen A. Reddy,Alvio Renzini,Hans-Walter Rix,Aday R. Robaina,Steven A. Rodney,David J. Rosario,Piero Rosati,S. Salimbeni,Claudia Scarlata,Brian Siana,Luc Simard,Joseph Smidt,Rachel S. Somerville,Hyron Spinrad,Amber Straughn,Louis-Gregory Strolger,Olivia Telford,Harry I. Teplitz,Jonathan R. Trump,Arjen van der Wel,Carolin Villforth,Risa H. Wechsler,Benjamin J. Weiner,Tommy Wiklind,Vivienne Wild,Grant W. Wilson,Stijn Wuyts,Hao Jing Yan,Min S. Yun +108 more
TL;DR: The Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) as discussed by the authors was designed to document the first third of galactic evolution, from z approx. 8 - 1.5 to test their accuracy as standard candles for cosmology.
Journal ArticleDOI
The Cosmic Evolution Survey (COSMOS): Overview*
Nick Scoville,Nick Scoville,Herve Aussel,Marcella Brusa,Peter Capak,C. M. Carollo,Martin Elvis,Mauro Giavalisco,Luigi Guzzo,Guenther Hasinger,Chris Impey,Jean-Paul Kneib,O. LeFevre,Simon J. Lilly,Bahram Mobasher,Alvio Renzini,Alvio Renzini,R. M. Rich,David B. Sanders,Eva Schinnerer,Eva Schinnerer,D. Schminovich,Patrick L. Shopbell,Yoshiaki Taniguchi,Neil De Grasse Tyson +24 more
TL;DR: The Cosmic Evolution Survey (COSMOS) as mentioned in this paper 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.
Journal ArticleDOI
UV Star Formation Rates in the Local Universe
Samir Salim,R. Michael Rich,Stephane Charlot,Jarle Brinchmann,Benjamin D. Johnson,David Schiminovich,Mark Seibert,Ryan Mallery,Timothy M. Heckman,Karl Forster,Peter G. Friedman,D. Christopher Martin,Patrick Morrissey,Susan G. Neff,Todd Small,Ted K. Wyder,Luciana Bianchi,Jose Donas,Young-Wook Lee,Barry F. Madore,Bruno Milliard,Alexander S. Szalay,Barry Y. Welsh,Sukyoung K. Yi +23 more
TL;DR: In this article, the authors measured star formation rates (SFRs) of 50,000 optically selected galaxies in the local universe (z ≈ 0.1) by fitting the GALEX (ultraviolet) and SDSS photometry to a library of dustattenuated population synthesis models.
Journal ArticleDOI
Detailed decomposition of galaxy images. ii. beyond axisymmetric models
TL;DR: GALFIT as discussed by the authors is a 2D fitting algorithm that allows for irregular, curved, logarithmic and power-law spirals, ring, and truncated shapes in otherwise traditional parametric functions.
Journal ArticleDOI
The Epochs of Early-Type Galaxy Formation as a Function of Environment
TL;DR: In this article, the authors derived ages, total metallicities, and element ratios of 124 early-type galaxies in high and low-density environments, and analyzed the data by comparison with mock galaxy samples created through Monte Carlo simulations taking the typical average observational errors into account.
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