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AEGIS20: A radio survey of the Extended Groth Strip

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 2041-8205. doi:10.1086/517917.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ivison, R. J.0000-0001-5118-1313
Faber, S. M.0000-0003-4996-214X
Smail, Ian0000-0003-3037-257X
Biggs, A. D.0000-0002-1117-9961
Conselice, C. J.0000-0003-1949-7638
Wilson, G.0000-0002-6572-7089
Salim, S.0000-0003-2342-7501
Willner, S. P.0000-0002-9895-5758
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
Issue or Number:1
Record Number:CaltechAUTHORS:IVIapjl07
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13426
Deposited By: Tony Diaz
Deposited On:01 Jun 2009 17:06
Last Modified:08 Nov 2021 22:37

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