Deep mid-infrared observations of Lyman-break galaxies

Details Deep mid-infrared observations of Lyman-break galaxies Deep mid-infrared observations of Lyman-break galaxies

2004-05-31

arxiv.org/abs/astro-ph/0405624v1

Astrophys.J.Suppl.154:97-102,2004

Astronomy and Astrophysics

Astrophysics

ApJS in press (Spitzer special issue); 13 pages, 3 figures

Scientific paper

10.1086/422712

As part of the In-Orbit Checkout activities for the Spitzer Space Telescope, the IRAC team carried out a deep observation (average integration time ~8 hours) of a field surrounding the bright QSO HS 1700+6416. This field contains several hundred z~3 Lyman-break galaxy candidates, and we report here on their mid-infrared properties, including the IRAC detection rate, flux densities and colors, and the results of fitting population synthesis models to the optical, near-infrared, and IRAC magnitudes. The results of the model-fitting show that previous optical/near-infrared studies of LBGs were not missing large, hidden old stellar populations. The LBG candidates' properties are consistent with those of massive, star-forming galaxies at z~3. Other IRAC sources in the same field have similar properties, so IRAC selection may prove a promising method of finding additional high-redshift galaxies.

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