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High-z Galaxies Detected by the GOODS IRAC Observations in the HST Ultra Deep Field

Yan, Haojing and Dickinson, Mark and Giavalisco, Mauro and Ferguson, Henry C. and Stern, Daniel and Eisenhardt, Peter R. M. and Chary, Ranga-Ram and Casertano, Stefano and Conselice, Christopher J. and Papovich, Casey and Reach, William T. and Moustakas, Leonidas A. (2006) High-z Galaxies Detected by the GOODS IRAC Observations in the HST Ultra Deep Field. In: The Spitzer Space Telescope: New Views of the Cosmos. ASP Conference Series. No.357. Astronomical Society of the Pacific , San Francisco, CA, pp. 288-289. ISBN 978-1-583812-25-9.

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The first epoch of Infrared Array Camera (IRAC) observations of the Great Observatories Origins Deep Survey (GOODS) Spitzer Legacy Program have successfully detected galaxies out to z ≈ 6, allowing us to study the rest-frame optical properties of galaxies at these very high redshifts. We investigate such properties of a collection of Lyman-break galaxy candidates at z=5–6 in the Hubble Ultra Deep Field (HUDF), several of which have spectroscopic confirmations. We find that the bulk of the rest-frame optical fluxes of these IRAC-identified high-redshift galaxies are best fitted by well-evolved stellar populations with stellar masses of a few ×10^(10) M_☉ and ages of a few hundred million years. This implies that massive galaxies already existed when the universe was only ~0.9 Gyr old, and that the formation redshifts of their evolved components could be as early as at z_f ≈ 10–11. These evolved populations can be well explained by a single stellar population, suggesting that they were formed through a sudden on-set rather than a prolonged process. Their colors are consistent with solar metallicity, suggesting that they might already have been significantly polluted by metals.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Dickinson, Mark0000-0001-5414-5131
Giavalisco, Mauro0000-0002-7831-8751
Ferguson, Henry C.0000-0001-7113-2738
Stern, Daniel0000-0003-2686-9241
Chary, Ranga-Ram0000-0001-7583-0621
Conselice, Christopher J.0000-0003-1949-7638
Papovich, Casey0000-0001-7503-8482
Reach, William T.0000-0001-8362-4094
Moustakas, Leonidas A.0000-0003-3030-2360
Additional Information:© 2006 Astronomical Society of the Pacific. We acknowledge the support provided by NASA through Contract Number 1224666 issued by JPL/Caltech under NASA contract 1407.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Series Name:ASP Conference Series
Issue or Number:357
Record Number:CaltechAUTHORS:20110809-092533552
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24755
Deposited By: Jason Perez
Deposited On:09 Aug 2011 20:18
Last Modified:09 Mar 2020 13:19

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