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Title: A search for the lenses in the Herschel Bright Sources (HerBS) sample

Abstract

ABSTRACT Verifying that sub-mm galaxies are gravitationally lensed requires time-expensive observations with oversubscribed high-resolution observatories. Here, we aim to strengthen the evidence of gravitational lensing within the Herschel Bright Sources (HerBS) by cross-comparing their positions to optical (SDSS) and near-infrared (VIKING) surveys, in order to search for the foreground lensing galaxy candidates. Resolved observations of the brightest HerBS sources have already shown that most are lensed, and a galaxy evolution model predicts that ∼76 per cent of the total HerBS sources are lensed, although with the SDSS survey we are only able to identify the likely foreground lenses for 25 per cent of the sources. With the near-infrared VIKING survey, however, we are able to identify the likely foreground lenses for 57 per cent of the sources, and we estimate that 82 per cent of the HerBS sources have lenses on the VIKING images even if we cannot identify the lens in every case. We find that the angular offsets between lens and Herschel source are larger than that expected if the lensing is done by individual galaxies. We also find that the fraction of HerBS sources that are lensed falls with decreasing 500-micron flux density, which is expected from the galaxy evolution model. Finally, we apply ourmore » statistical VIKING cross-identification to the entire Herschel-ATLAS catalogue, where we also find that the number of lensed sources falls with decreasing 500-micron flux density.« less

Authors:
ORCiD logo [1];  [2];  [2]
  1. Department of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, UK, Division of Particle and Astrophysical Science, Graduate School of Science, Nagoya University, Aichi 464-8602, Japan, National Astronomical Observatory of Japan, 2-21-1, Osawa, Mitaka, Tokyo 181-8588, Japan
  2. Department of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, UK
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1605036
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
[Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 493 Journal Issue: 3]; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Bakx, Tom J. L. C., Eales, Stephen, and Amvrosiadis, Aristeidis. A search for the lenses in the Herschel Bright Sources (HerBS) sample. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa506.
Bakx, Tom J. L. C., Eales, Stephen, & Amvrosiadis, Aristeidis. A search for the lenses in the Herschel Bright Sources (HerBS) sample. United Kingdom. doi:10.1093/mnras/staa506.
Bakx, Tom J. L. C., Eales, Stephen, and Amvrosiadis, Aristeidis. Thu . "A search for the lenses in the Herschel Bright Sources (HerBS) sample". United Kingdom. doi:10.1093/mnras/staa506.
@article{osti_1605036,
title = {A search for the lenses in the Herschel Bright Sources (HerBS) sample},
author = {Bakx, Tom J. L. C. and Eales, Stephen and Amvrosiadis, Aristeidis},
abstractNote = {ABSTRACT Verifying that sub-mm galaxies are gravitationally lensed requires time-expensive observations with oversubscribed high-resolution observatories. Here, we aim to strengthen the evidence of gravitational lensing within the Herschel Bright Sources (HerBS) by cross-comparing their positions to optical (SDSS) and near-infrared (VIKING) surveys, in order to search for the foreground lensing galaxy candidates. Resolved observations of the brightest HerBS sources have already shown that most are lensed, and a galaxy evolution model predicts that ∼76 per cent of the total HerBS sources are lensed, although with the SDSS survey we are only able to identify the likely foreground lenses for 25 per cent of the sources. With the near-infrared VIKING survey, however, we are able to identify the likely foreground lenses for 57 per cent of the sources, and we estimate that 82 per cent of the HerBS sources have lenses on the VIKING images even if we cannot identify the lens in every case. We find that the angular offsets between lens and Herschel source are larger than that expected if the lensing is done by individual galaxies. We also find that the fraction of HerBS sources that are lensed falls with decreasing 500-micron flux density, which is expected from the galaxy evolution model. Finally, we apply our statistical VIKING cross-identification to the entire Herschel-ATLAS catalogue, where we also find that the number of lensed sources falls with decreasing 500-micron flux density.},
doi = {10.1093/mnras/staa506},
journal = {Monthly Notices of the Royal Astronomical Society},
number = [3],
volume = [493],
place = {United Kingdom},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1093/mnras/staa506

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