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28 March 2024
 
  » arxiv » astro-ph/0408367

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Evolved Galaxies at z > 1.5 from the Gemini Deep Deep Survey: The Formation Epoch of Massive Stellar Systems
Patrick J. McCarthy ; Damien Le Borgne ; David Crampton ; Hsiao-Wen Chen ; Roberto G. Abraham ; Karl Glazebrook ; Sandra Savaglio ; Raymond G. Carlberg ; Ronald O. Marzke ; Kathy Roth ; Inger Jorgensen ; Isobel Hook ; Richard Murowinski ; Stephanie Juneau ( Carnegie Observatories ; U. Toronto ; NRC HIA JHU ; MIT ; Gemini Northern Operations Center ; UK Gemini Operations Center ; SFSU ; INAF ; Italy ;
Date 20 Aug 2004
Journal Astrophys.J. 614 (2004) L9-L12
Subject astro-ph
Affiliation5,10), Roberto G. Abraham , Karl Glazebrook , Sandra Savaglio (4,9), Raymond G. Carlberg , Ronald O. Marzke , Kathy Roth , Inger Jorgensen , Isobel Hook , Richard Murowinski and Stephanie Juneau ( Carnegie Observatories, U. Toronto, NRC HIA JHU,
AbstractWe present spectroscopic evidence from the Gemini Deep Deep Survey (GDDS) for a significant population of color-selected red galaxies at 1.3 < z < 2.2 whose integrated light is dominated by evolved stars. Unlike radio-selected objects, the z > 1.5 old galaxies have a sky density > 0.1 per sq. arcmin. Conservative age estimates for 20 galaxies with z > 1.3; = 1.49, give a median age of 1.2 Gyr and = 2.4. One quarter of the galaxies have inferred z_f > 4. Models restricted to abundances less than or equal to solar give median ages and z_f of 2.3 Gyr and 3.3, respectively. These galaxies are among the most massive and contribute approximately 50% of the stellar mass density at 1 < z < 2. The derived ages and most probable star formation histories suggest a high star-formation-rate (300-500 solar masses per year) phase in the progenitor population. We argue that most of the red galaxies are not descendants of the typical z=3 Lyman break galaxies. Galaxies associated with luminous sub-mm sources have the requisite star formation rates to be the progenitor population. Our results point toward early and rapid formation for a significant fraction of present day massive galaxies.
Source arXiv, astro-ph/0408367
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