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Spitzer Observations of z ~ 3 Lyman Break Galaxies: Stellar Masses and Mid-Infrared Properties

Rigopoulou, D. and Huang, J.-S. and Papovich, C. and Ashby, M. L. N. and Barmby, P. and Shu, C. and Bundy, K. and Egami, E. and Magdis, G. and Smith, H. and Willner, S. P. and Wilson, G. and Fazio, G. G. (2006) Spitzer Observations of z ~ 3 Lyman Break Galaxies: Stellar Masses and Mid-Infrared Properties. Astrophysical Journal, 648 (1). pp. 81-94. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20100430-135757620

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Abstract

We describe the spectral energy distributions (SEDs) of Lyman break galaxies (LBGs) at z ~ 3, using deep mid-infrared and optical observations of the extended Groth strip, obtained with IRAC and MIPS on board Spitzer and from the ground, respectively. We focus on LBGs with detections at all four IRAC bands, in particular the 26 galaxies with IRAC 8 μm band (rest-frame K-band) detections. We use stellar population-synthesis models and probe the stellar content of these galaxies. Based on best-fit continuous star formation models, we derive estimates of the stellar mass for these LBGs. As in previous studies, we find that a fraction of LBGs have very red colors and large estimated stellar masses (M_* > 5 × 10^(10) M_⊙); the current Spitzer data allow us, for the first time, to study these massive LBGs in detail. We discuss the link between these LBGs and submillimeter-luminous galaxies, and we find that the number density of these massive LBGs at high redshift is higher than predicted by current semianalytic models of galaxy evolution.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/505784DOIArticle
http://iopscience.iop.org/0004-637X/648/1/81/PublisherArticle
ORCID:
AuthorORCID
Ashby, M. L. N.0000-0002-3993-0745
Bundy, K.0000-0001-9742-3138
Magdis, G.0000-0002-4872-2294
Willner, S. P.0000-0002-9895-5758
Wilson, G.0000-0002-6572-7089
Fazio, G. G.0000-0002-0670-0708
Additional Information:© 2006 The American Astronomical Society. Received 2005 December 14; accepted 2006 May 12. We thank the anonymous referee for his/her suggestions on improving the manuscript. We thank S. Miyazaki for making the SUBARU R-band image available. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407. Support for this work was provided by NASA through contract 1256790, issued by the JPL. D. R. acknowledges support from the Leverhulme Trust via a Research Fellowship grant.
Funders:
Funding AgencyGrant Number
NASA1256790
Leverhulme TrustUNSPECIFIED
Subject Keywords:cosmology : observations; galaxies : evolution; galaxies : high redshift; galaxies : stellar content; infrared : galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:20100430-135757620
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100430-135757620
Official Citation:D. Rigopoulou et al 2006 ApJ 648 81 doi: 10.1086/505784
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18093
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:11 May 2010 20:32
Last Modified:04 Nov 2019 05:46

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