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Massive and Evolved Galaxies at z ≥ 5

Published online by Cambridge University Press:  01 August 2006

T. Wiklind ,
B. Mobasher ,
M. Dickinson ,
H. Ferguson ,
M. Giavalisco ,
N. Grogin  and
N. Panagia
T. Wiklind
Affiliation:
ESA/STScI, Baltimore, MD 21218, USA email: wiklind@stsci.edu
B. Mobasher
Affiliation:
ESA/STScI, Baltimore, MD 21218, USA email: wiklind@stsci.edu
M. Dickinson
Affiliation:
NOAO, Tucson, AZ 85726, USA
H. Ferguson
Affiliation:
STScI, Baltimore, MD 21218, USA
M. Giavalisco
Affiliation:
STScI, Baltimore, MD 21218, USA
N. Grogin
Affiliation:
Johns Hopkins University, Baltimore, MD 21218, USA
N. Panagia
Affiliation:
STScI, Baltimore, MD 21218, USA
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Abstract

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We search for massive and evolved galaxies at z ≥ 5 in the Great Observatories Origins Deep Survey (GOODS) southern field. Combining HST ACS, VLT ISAAC and Spitzer IRAC broad–band photometric data, we develop a color selection technique to identify candidates for being evolved galaxies at high redshifts. The color selection is primarily based on locating the Balmer–break using the K- and 3.6 μm bands. Stellar population synthesis models are fitted to the SEDs of these galaxies to identify the final sample. We find 11 candidates with photometric redshifts in the range 4.9 < z < 5.6, dominated by an old stellar population, with ages 0.2-1.0 Gyr, and stellar masses in the range (0.7 − 5) × 1011 M⊙. Most of the candidates have modest amounts of internal dust extinction. The majority of the stars in these galaxies were formed at z>9 and the current star formation activity is a few percent of the inferred initial star formation rate.

Keywords

galaxies: evolutiongalaxies: formationgalaxies: high redshift
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 368 - 372
Copyright
Copyright © International Astronomical Union 2007

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