HerMES: CANDIDATE GRAVITATIONALLY LENSED GALAXIES AND LENSING STATISTICS AT SUBMILLIMETER WAVELENGTHS

Julie L Wardlow; Asantha Cooray; Francesco De Bernardis; J Calanog; A Amblard; V Arumugam; H Aussel; M Bethermin; A. J Baker; R Blundell; R. S Bussmann; J Bock; C Bridge; J. M Carpenter; A Boselli; V Buat; D Burgarella; A Cabrera-Lavers; N Castro-Rodriguez; C. M Casey; Hai Fu

doi:10.1088/0004-637X/762/1/59

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HerMES: CANDIDATE GRAVITATIONALLY LENSED GALAXIES AND LENSING STATISTICS AT SUBMILLIMETER WAVELENGTHS

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HerMES: CANDIDATE GRAVITATIONALLY LENSED GALAXIES AND LENSING STATISTICS AT SUBMILLIMETER WAVELENGTHS

Julie L Wardlow, Asantha Cooray, Francesco De Bernardis, J Calanog, A Amblard, V Arumugam, H Aussel, M Bethermin, A. J Baker, R Blundell, …

The Astrophysical journal, Vol.762(1), pp.1-28

01/01/2013

DOI: 10.1088/0004-637X/762/1/59

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Abstract

We present a list of 13 candidate gravitationally lensed submillimeter galaxies (SMGs) from 95 deg{sup 2} of the Herschel Multi-tiered Extragalactic Survey, a surface density of 0.14 {+-} 0.04 deg{sup -2}. The selected sources have 500 {mu}m flux densities (S {sub 500}) greater than 100 mJy. Gravitational lensing is confirmed by follow-up observations in 9 of the 13 systems (70%), and the lensing status of the four remaining sources is undetermined. We also present a supplementary sample of 29 (0.31 {+-} 0.06 deg{sup -2}) gravitationally lensed SMG candidates with S {sub 500} = 80-100 mJy, which are expected to contain a higher fraction of interlopers than the primary candidates. The number counts of the candidate lensed galaxies are consistent with a simple statistical model of the lensing rate, which uses a foreground matter distribution, the intrinsic SMG number counts, and an assumed SMG redshift distribution. The model predicts that 32%-74% of our S {sub 500} {>=} 100 mJy candidates are strongly gravitationally lensed ({mu} {>=} 2), with the brightest sources being the most robust; this is consistent with the observational data. Our statistical model also predicts that, on average, lensed galaxies with S {sub 500} = 100 mJy are magnified by factors of {approx}9, with apparently brighter galaxies having progressively higher average magnification, due to the shape of the intrinsic number counts. 65% of the sources are expected to have intrinsic 500 {mu}m flux densities less than 30 mJy. Thus, samples of strongly gravitationally lensed SMGs, such as those presented here, probe below the nominal Herschel detection limit at 500 {mu}m. They are good targets for the detailed study of the physical conditions in distant dusty, star-forming galaxies, due to the lensing magnification, which can lead to spatial resolutions of {approx}0.''01 in the source plane.

Astronomy

ASTROPHYSICS, COSMOLOGY AND ASTRONOMY

FLUX DENSITY

GALACTIC EVOLUTION

GALAXIES

GRAVITATIONAL LENSES

MICROWAVE RADIATION

MICROWAVE SPECTRA

RED SHIFT

SENSITIVITY

SPATIAL RESOLUTION

STAR EVOLUTION

STARS

STATISTICAL MODELS

Details

Title: Subtitle: HerMES: CANDIDATE GRAVITATIONALLY LENSED GALAXIES AND LENSING STATISTICS AT SUBMILLIMETER WAVELENGTHS
Creators: Julie L Wardlow - University of California, Irvine
Asantha Cooray - University of California, Irvine
Francesco De Bernardis - University of California, Irvine
J Calanog - University of California, Irvine
A Amblard - Ames Research Center
V Arumugam - University of Edinburgh
H Aussel - Université Paris Diderot
M Bethermin - Université Paris-Sud
A. J Baker - Rutgers, The State University of New Jersey
R Blundell - Harvard University
R. S Bussmann - Harvard University
J Bock - California Institute of Technology
C Bridge - California Institute of Technology
J. M Carpenter - California Institute of Technology
A Boselli - Aix-Marseille Université
V Buat - Aix-Marseille Université
D Burgarella - Aix-Marseille Université
A Cabrera-Lavers
N Castro-Rodriguez - Instituto de Astrofísica de Canarias
C. M Casey - University of Hawaii
Hai Fu - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.762(1), pp.1-28
DOI: 10.1088/0004-637X/762/1/59
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: Institute of Physics (IOP)
Language: English
Date published: 01/01/2013
Academic Unit: Physics and Astronomy
Record Identifier: 9984199711302771

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