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IRS spectroscopic studies of ULIRGs at z ~ 2

Published online by Cambridge University Press:  17 July 2013

Guanwen Fang ,
Xu Kong ,
Jia-Sheng Huang  and
Zhongyang Ma
Guanwen Fang
Affiliation:
Institute for Astronomy and History of Science and Technology, Dali University, Yunnan, 671003, China
Xu Kong
Affiliation:
Center for Astrophysics, University of Science and Technology of China, Anhui, 230026, China email: [email protected] Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences, China
Jia-Sheng Huang
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA02138, USA
Zhongyang Ma
Affiliation:
Center for Astrophysics, University of Science and Technology of China, Anhui, 230026, China email: [email protected]
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Abstract

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We present a result of IRS spectroscopy of 14 Ultra-Luminous Infrared Galaxies (ULIRGs) in the Extended Groth Strip region. These galaxies are massive and have very high star formation rate. Four objects of this sample are detected in the HST/WFC3 near-infrared imaging. They show very diversified rest-frame optical morphologies, including string-like, extended/diffused, and even spiral with a possible bulge, implying different formation processes for these galaxies. We also search for signatures of active galactic nucleus (AGN) in our sample in the X-ray, mid-infrared and radio bands. This sample is dominated by objects with intensive star formation, only 14–29% of them have AGN activities.

Keywords

galaxies: fundamental parametersgalaxies: high-redshiftinfrared: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S295: The intriguing life of massive galaxies , August 2012 , pp. 82 - 85
Copyright
Copyright © International Astronomical Union 2013 

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