Ivison, R. J. and Chapman, S. C. and Faber, S. M. and Smail, Ian and Biggs, A. D. and Conselice, C. J. and Wilson, G. and Salim, S. and Huang, J.-S. and Willner, S. P. (2007) AEGIS20: A radio survey of the Extended Groth Strip. Astrophysical Journal Letters, 660 (1). L77-L80. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:IVIapjl07
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We describe AEGIS20-a radio survey of the Extended Groth Strip (EGS) conducted with the Very Large Array (VLA) at 1.4 GHz. The resulting catalog contains 1123 emitters and is sensitive to ultraluminous (10^12 L⊙) starbursts to z ≤ 1.3, well matched to the redshift range of the DEEP2 spectroscopic survey in this region. We use stacking techniques to explore the microjansky-level emission from a variety of galaxy populations selected via conventional criteria-Lyman break galaxies (LBGs), distant red galaxies (DRGs), UV-selected galaxies, and extremely red objects (EROs)-determining their properties as a function of color, magnitude, and redshift and their extinction-free contributions to the history of star formation. We confirm the familiar pattern that the star formation rate (SFR) density, ρ_*, increases by at least a factor of ~5 from z = 0 to 1, although we note highly discrepant UV- and radio-based SFR estimates. Our radio-based SFRs become more difficult to interpret at z > 1 where correcting for contamination by radio-loud active galactic nuclei (AGNs) comes at the price of rejecting luminous starbursts. While stacking radio images is a useful technique, accurate radio-based SFRs for z » 1 galaxies require precise redshifts and extraordinarily high fidelity radio data to identify and remove accretion-related emission.
|Additional Information:||© 2007 The American Astronomical Society. Received 2006 May 14; accepted 2006 October 2; published 2007 April 5.|
|Subject Keywords:||cosmology: observations; galaxies: evolution; galaxies: formation|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||01 Jun 2009 17:06|
|Last Modified:||26 Dec 2012 10:50|
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