2024-03-28T19:34:11Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00030343
2023-01-16T04:23:44Z
336:695:696
A search for the lenses in the Herschel Bright Sources (HerBS) sample
Bakx, Tom J L C
Eales, Stephen
Amvrosiadis, Aristeidis
open access
This article has been accepted for publication in [Monthly Notices of the Royal Astronomical Society] ©: [2020] [authors] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
gravitational lensing: strong
galaxies: high redshift
submillimetre: galaxies
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.
Oxford University Press
2020-04
eng
journal article
VoR
http://hdl.handle.net/2237/00032529
https://nagoya.repo.nii.ac.jp/records/30343
https://doi.org/10.1093/mnras/staa506
0035-8711
Monthly Notices of the Royal Astronomical Society
493
3
4276
4293
https://nagoya.repo.nii.ac.jp/record/30343/files/staa506.pdf
application/pdf
7.0 MB
2020-07-31