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AEGIS: Infrared spectroscopy of an infrared-luminous Lyman break galaxy at z = 3.01

Huang, J.-S. and Rigopoulou, D. and Papovich, C. and Ashby, M. L. N. and Willner, S. P. and Ivison, R. and Laird, E. S. and Webb, T. and Wilson, G. and Barmby, P. and Chapman, S. and Conselice, C. J. and McLeod, B. and Shu, C. G. and Smith, H. A. and Le Floc'h, E. and Egami, E. and Willmer, C. A. N. and Fazio, G. G. (2007) AEGIS: Infrared spectroscopy of an infrared-luminous Lyman break galaxy at z = 3.01. Astrophysical Journal Letters, 660 (1). L69-L72. ISSN 2041-8205. doi:10.1086/508567.

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We report the detection of rest-frame 6.2 and 7.7 μm emission features arising from polycyclic aromatic hydrocarbons (PAHs) in the Spitzer IRS spectrum of an infrared-luminous Lyman break galaxy at z=3.01. This is currently the highest redshift galaxy where these PAH emission features have been detected. The total IR luminosity inferred from the MIPS 24 μm and radio flux density is 2 x 10^13L., which qualifies this object as a so-called hyperluminous infrared galaxy (HyLIRG). However, unlike local HyLIRGs, which are generally associated with QSO/AGNs and have weak or absent PAH emission features, this HyLIRG has very strong 6.2 and 7.7 μm PAH emission. We argue that intense star formation dominates the IR emission of this source, although we cannot rule out the presence of a deeply obscured AGN. This LBG appears to be a distorted system in the HST ACS F606W and F814W images, possibly indicating that a significant merger or interaction is driving the large IR luminosity.

Item Type:Article
Related URLs:
URLURL TypeDescription
Rigopoulou, D.0000-0001-6854-7545
Papovich, C.0000-0001-7503-8482
Ashby, M. L. N.0000-0002-3993-0745
Willner, S. P.0000-0002-9895-5758
Ivison, R.0000-0001-5118-1313
Wilson, G.0000-0002-6572-7089
Barmby, P.0000-0003-2767-0090
Conselice, C. J.0000-0003-1949-7638
Fazio, G. G.0000-0002-0670-0708
Additional Information:© 2007 The American Astronomical Society. Received 2006 May 31; accepted 2006 August 22; published 2006 September 20. We wish to thank our collaborators on the AEGIS project for many insightful conversations and much hard work. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.
Funding AgencyGrant Number
Subject Keywords:cosmology: observations; galaxies: high-redshift; galaxies: starburst; infrared: galaxies
Issue or Number:1
Record Number:CaltechAUTHORS:HUAapjl07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11609
Deposited By: Tony Diaz
Deposited On:11 Sep 2008 17:39
Last Modified:08 Nov 2021 22:01

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