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Discovery of a Galaxy Responsible for a DLA System at z=3.15 and a Near-Infrared Search for Primeval Galaxies

M. A. Pahre·S. G. Djorgovski·J. Bechtold·R. Elston
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Abstract

We report the detection, both in line and continuum emission, of a galaxy responsible for a damped Ly-alpha absorption (DLA) system at z=3.15 projected 2.3 arcsec from QSO 2233+131. The star formation rate implied by both the Ly-alpha and restframe far-UV continuum is approximately 7 M_sun / yr. The galaxy also shows no sign of an active nucleus and has blue colors, both consistent with it being observed early in its star formation history. The Ly-alpha emission is offset approximately 200 km/s from the DLA velocity, which could be explained as the rotational signature of a disk galaxy. We also report on the progress of an ongoing near-infrared narrow-band search with the Keck telescope for line emission from a population of primeval galaxies at high redshift. We have found several promising candidates which are being followed up with optical spectroscopy. Our survey is beginning to place constraints on a possible population of slightly dusty primeval galaxies at high redshift.

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M. A. Pahre, S. G. Djorgovski, J. Bechtold, R. Elston. 1996-09-10. Discovery of a Galaxy Responsible for a DLA System at z=3.15 and a Near-Infrared Search for Primeval Galaxies. https://arxiv.org/abs/astro-ph/9609077

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