Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-07-14
Mon.Not.Roy.Astron.Soc.374:910-930,2007
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS. Minor changes in response to referee report
Scientific paper
10.1111/j.1365-2966.2006.11197.x
We measure the ages, stellar masses, and star formation histories of z~6 galaxies, observed within 1Gyr of the Big Bang. We use imaging from HST and Spitzer from the public "Great Observatories Origins Deep Survey", coupled with ground-based near-infrared imaging, to measure the spectral energy distributions from 0.8-5microns, spanning the rest-frame UV and optical. From our sample of ~50 i-drop Lyman-break star-forming galaxies in GOODS-South with z'(AB)<27mag, we focus on ~30 with reliable photometric or spectroscopic redshifts. Half of these are confused with foreground sources at Spitzer resolution, but from the 16 with clean photometry we find that a surprisingly large fraction (40%) have evidence for substantial Balmer-breaks. This indicates the presence of old underlying stellar populations that dominate the stellar masses. For these objects, we find ages of 200-700Myr, implying formation redshifts of 7
Bunker Andrew
Chiu Kuenley
Ellis Richard
Eyles Laurence
Lacy Mark
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