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The Circumgalactic Medium of Submillimeter Galaxies. I. First Results from A Radio-Identified Sample

Hai, F and Fu, H and Hennawi, JF and Prochaska, JX and Mutel, R and Casey, C and Cooray, A and Kereš, D and Zhang, ZY and Clements, D and Isbell, J and Lang, C and McGinnis, D and Michałowski, MJ and Mooley, K and Perley, DA and Stockton, A and Thompson, D (2016) The Circumgalactic Medium of Submillimeter Galaxies. I. First Results from A Radio-Identified Sample. The Astrophysical Journal, 832 (1). ISSN 1538-4357

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Abstract

The American Astronomical Society. All rights reserved..We present the first results from an ongoing survey to characterize the circumgalactic medium (CGM) of massive high-redshift galaxies detected as submillimeter galaxies (SMGs). We constructed a parent sample of 163 SMG-QSO pairs with separations less than ∼36″ by cross-matching far-infrared-selected galaxies from Herschel with spectroscopically confirmed QSOs. The Herschel sources were selected to match the properties of the SMGs. We determined the sub-arcsecond positions of six Herschel sources with the Very Large Array and obtained secure redshift identification for three of those with near-infrared spectroscopy. The QSO sightlines probe transverse proper distances of 112, 157, and 198 kpc at foreground redshifts of 2.043, 2.515, and 2.184, respectively, which are comparable to the virial radius of the ∼1013 M o halos expected to host SMGs. High-quality absorption-line spectroscopy of the QSOs reveals systematically strong H i Ly absorption around all three SMGs, with rest-frame equivalent widths of ∼2-3. However, none of the three absorbers exhibit compelling evidence for optically thick H i gas or metal absorption, in contrast to the dominance of strong neutral absorbers in the CGM of luminous z ∼ 2 QSOs. The low covering factor of optically thick H i gas around SMGs tentatively indicates that SMGs may not have as prominent cool gas reservoirs in their halos as the coeval QSOs and that they may inhabit less massive halos than previously thought. © 2016.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 17 Feb 2017 11:34
Last Modified: 09 Sep 2017 13:28
DOI or Identification number: 10.3847/0004-637X/832/1/52
URI: http://researchonline.ljmu.ac.uk/id/eprint/5557

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