Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-15
Astrophys.J.648:81-94,2006
Astronomy and Astrophysics
Astrophysics
accepted for publication by Astrophysical Journal
Scientific paper
10.1086/505784
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 micron 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_stellar > 5 x 10 ^{10} M_solar): the present Spitzer data allow us, for the first time, to study these massive LBGs in detail. We discuss the link between these LBGs and submm-luminous galaxies.We find that the number density of these massive LBGs at high redshift is higher than predicted by current semi-analytic models of galaxy evolution.
Ashby Matt L. N.
Barmby Pauline
Bundy Kevin
Egami Eiichi E.
Fazio Giacomo
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