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Title: THE EARLY EARLY TYPE: DISCOVERY OF A PASSIVE GALAXY AT z{sub spec} {approx} 3

Abstract

We present the discovery of a massive, quiescent galaxy at z = 2.99. We have obtained an Hubble Space Telescope WFC3 spectrum of this object and measured its redshift from the detection of a deep 4000 A break consistent with an old population and a high metallicity. By stellar population modeling of both its grism spectrum and broadband photometry, we derive an age of {approx}0.7 Gyr, implying a formation redshift of z > 4, and a mass >10{sup 11} M{sub Sun }. Although this passive galaxy is the most distant confirmed so far, we find that it is slightly less compact than other z > 2 early types of similar mass, being overall more analogous to those z {approx} 1.6 field early-type galaxies. The discovery of this object shows that early-type galaxies are detectable to at least z = 3 and suggests that the diversity of structural properties found in z = 1.4-2 ellipticals to earlier epochs could have its origin in a variety of formation histories among their progenitors.

Authors:
; ; ;  [1]; ;  [2];  [3];  [4];  [5]
  1. Laboratoire AIM-Paris-Saclay, CEA/DSM-CNRS, Universite Paris Diderot, Irfu/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, F-91191 Gif sur Yvette (France)
  2. Institute for Astronomy, ETH Zuerich Wolfgang-Pauli-strasse 27, CH-8093 Zuerich (Switzerland)
  3. INAF, Osservatorio Astronomico di Padova Vicolo dell'Osservatorio 5, I-35122 Padova (Italy)
  4. National Optical Astronomy Observatory, P.O. Box 26732, Tucson, AZ 85726 (United States)
  5. Dipartimento di Astronomia, Universita di Bologna, Via Ranzani 1, I-40127 Bologna (Italy)
Publication Date:
OSTI Identifier:
22078433
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 759; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPUTERIZED SIMULATION; GALACTIC EVOLUTION; GALAXIES; MASS; ORIGIN; PHOTOMETRY; RED SHIFT; SPECTRA; TELESCOPES

Citation Formats

Gobat, R., Strazzullo, V., Daddi, E., Bethermin, M., Onodera, M., Carollo, M., Renzini, A., Dickinson, M., and Cimatti, A. THE EARLY EARLY TYPE: DISCOVERY OF A PASSIVE GALAXY AT z{sub spec} {approx} 3. United States: N. p., 2012. Web. doi:10.1088/2041-8205/759/2/L44.
Gobat, R., Strazzullo, V., Daddi, E., Bethermin, M., Onodera, M., Carollo, M., Renzini, A., Dickinson, M., & Cimatti, A. THE EARLY EARLY TYPE: DISCOVERY OF A PASSIVE GALAXY AT z{sub spec} {approx} 3. United States. doi:10.1088/2041-8205/759/2/L44.
Gobat, R., Strazzullo, V., Daddi, E., Bethermin, M., Onodera, M., Carollo, M., Renzini, A., Dickinson, M., and Cimatti, A. Sat . "THE EARLY EARLY TYPE: DISCOVERY OF A PASSIVE GALAXY AT z{sub spec} {approx} 3". United States. doi:10.1088/2041-8205/759/2/L44.
@article{osti_22078433,
title = {THE EARLY EARLY TYPE: DISCOVERY OF A PASSIVE GALAXY AT z{sub spec} {approx} 3},
author = {Gobat, R. and Strazzullo, V. and Daddi, E. and Bethermin, M. and Onodera, M. and Carollo, M. and Renzini, A. and Dickinson, M. and Cimatti, A.},
abstractNote = {We present the discovery of a massive, quiescent galaxy at z = 2.99. We have obtained an Hubble Space Telescope WFC3 spectrum of this object and measured its redshift from the detection of a deep 4000 A break consistent with an old population and a high metallicity. By stellar population modeling of both its grism spectrum and broadband photometry, we derive an age of {approx}0.7 Gyr, implying a formation redshift of z > 4, and a mass >10{sup 11} M{sub Sun }. Although this passive galaxy is the most distant confirmed so far, we find that it is slightly less compact than other z > 2 early types of similar mass, being overall more analogous to those z {approx} 1.6 field early-type galaxies. The discovery of this object shows that early-type galaxies are detectable to at least z = 3 and suggests that the diversity of structural properties found in z = 1.4-2 ellipticals to earlier epochs could have its origin in a variety of formation histories among their progenitors.},
doi = {10.1088/2041-8205/759/2/L44},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}