Candidate gravitationally lensed dusty star-forming galaxies in the Herschel wide area surveys

Nayyeri, H, Keele, M, Cooray, A, Riechers, D A, Ivison, R J, Harris, A I, Frayer, D T, Baker, A J, Chapman, S C, Eales, S, Farrah, D, Fu, H, Marchetti, L, Marques-Chaves, R, Martinez-Navajas, P I, Oliver, S, Omont, A, Perez-Fournon, I, Scott, D, Vaccari, M, Vieira, J, Viero, M, Wang, L and Wardlow, J (2016) Candidate gravitationally lensed dusty star-forming galaxies in the Herschel wide area surveys. Astrophysical Journal, 823 (1). ISSN 0004-637X

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Abstract

We present a list of candidate gravitationally lensed dusty star-forming galaxies (DSFGs) from the HerMES Large Mode Survey (HeLMS) and the Herschel Stripe 82 Survey (HerS). Together, these partially overlapping surveys cover 372 deg2 on the sky. After removing local spiral galaxies and known radio-loud blazars, our candidate list of lensed DSFGs is composed of 77 sources with 500 _m ux densities (S500) greater than 100 mJy. Such sources are dusty starburst galaxies similar to the _rst bright Sub Millimeter Galaxies (SMGs) discovered with SCUBA. We expect a large fraction of this list to be strongly lensed, with a small fraction made up of bright SMG-SMG mergers that appear as Hyper-Luminous Infrared Galaxies (HyLIRGs; LIR > 1013 L_). Thirteen of the 77 candidates have spectroscopic redshifts from CO spectroscopy with ground-based interferometers, putting them at z > 1 and well above the redshift of the foreground lensing galaxies. The surface density of our sample is 0.21 _ 0.03 deg2. We present follow-up imaging of a few of the candidates confirming their lensing nature. The sample presented here is an ideal tool for higher resolution imaging and spectroscopic observations to understand detailed properties of starburst phenomena in distant galaxies.

Item Type: Article
Keywords: Gravitational lensing: strong Submillimeter: galaxies
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: Richard Chambers
Date Deposited: 20 May 2016 07:03
Last Modified: 07 Mar 2017 08:39
URI: http://sro.sussex.ac.uk/id/eprint/61091

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Project NameSussex Project NumberFunderFunder Ref
Astrophysics and Cosmology - Sussex Consolidated GrantG1291STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/L000652/1
HELP - Herschel Extragalactic Legacy ProjectG1265EUROPEAN UNIONFP7-SPACE-2013-1-607254