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FLASH: Faint Lenses from Associated Selection with Herschel

Bakx, Tom J L C; Gray, Bethany S; González-Nuevo, Joaquin; Bonavera, Laura; Amvrosiadis, Aristeidis; Eales, Stephen; Hagimoto, Masato; Serjeant, Stephen

FLASH: Faint Lenses from Associated Selection with Herschel Thumbnail


Authors

Tom J L C Bakx

Bethany S Gray

Joaquin González-Nuevo

Laura Bonavera

Stephen Eales

Masato Hagimoto

Stephen Serjeant



Abstract

We report the ALMA Band 7 observations of 86 Herschel sources that likely contain gravitationally lensed galaxies. These sources are selected with relatively faint 500 μm flux densities between 15 and 85 mJy in an effort to characterize the effect of lensing across the entire million-source Herschel catalogue. These lensed candidates were identified by their close proximity to bright galaxies in the near-infrared VISTA Kilo-Degree Infrared Galaxy survey. Our high-resolution observations (0.15 arcsec) confirm 47 per cent of the initial candidates as gravitational lenses, while lensing cannot be excluded across the remaining sample. We find average lensing masses (log M/M⊙ = 12.9 ± 0.5) in line with previous experiments, although direct observations might struggle to identify the most massive foreground lenses across the remaining 53 per cent of the sample, particularly for lenses with larger Einstein radii. Our observations confirm previous indications that more lenses exist at low flux densities than expected from strong galaxy–galaxy lensing models alone, where the excess is likely due to additional contributions of cluster lenses and weak lensing. If we apply our method across the total 660 square degree H-ATLAS field, it would allow us to robustly identify 3000 gravitational lenses across the 660 square degree Herschel ATLAS fields.

Citation

Bakx, T. J. L. C., Gray, B. S., González-Nuevo, J., Bonavera, L., Amvrosiadis, A., Eales, S., …Serjeant, S. (2023). FLASH: Faint Lenses from Associated Selection with Herschel. Monthly Notices of the Royal Astronomical Society, 527(3), 8865-8885. https://doi.org/10.1093/mnras/stad3759

Journal Article Type Article
Acceptance Date Nov 27, 2022
Online Publication Date Dec 6, 2023
Publication Date Dec 6, 2023
Deposit Date Mar 27, 2024
Publicly Available Date Mar 27, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 527
Issue 3
Pages 8865-8885
DOI https://doi.org/10.1093/mnras/stad3759
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL https://durham-repository.worktribe.com/output/2348795

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Licence
http://creativecommons.org/licenses/by/4.0/

Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.





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