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Paper: Faint Galaxies at Redshifts of ~ 1-2
Volume: 240, Gas and Galaxy Evolution: A Conference in Honor of the 20th Anniversary of the VLA
Page: 117
Authors: Yan, L.
Abstract: Increasing numbers of observations show that dusty starburst galaxies are probably much more numerous at high redshifts than today, and that optical surveys of the distant universe suffer from large extinction corrections. In this talk, I present a quantitative estimate of how much dust extinction correction must be applied to the rest-frame UV luminosity density at z~ 1.3. In addition, I discuss recent deep 1.4 GHz radio observations of extremely red galaxies (EROs). The fraction of bright EROs (H <20) detected in deep 1.4 GHz images is small, only 8-17%. The implication is that a large fraction of bright EROs are probably old ellipticals or systems with a small amount of star formation activity at z~ 1-2. We find that ~ 20% of well-detected micro-Jansky radio sources are very faint or even not detected in the optical and near-IR. An increasing number of observations suggest that optical/NIR-faint EROs (K >19.5-20) are likely to be dusty starburst systems at z~ 1-2, and are the best candidates for submillimeter sources.
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