Discovering New Strong Gravitational Lenses in the DESI Legacy Imaging Surveys

Huang, X.; Storfer, C.; Gu, A.; Ravi, V.; Pilon, A.; Sheu, W.; Venguswamy, R.; Banka, S.; Dey, A.; Landriau, M.; Lang, D.; Meisner, A.; Moustakas, J.; Myers, A. D.; Sajith, R.; Schlafly, E. F.; Schlegel, D. J.

doi:10.3847/1538-4357/abd62b

Title: Discovering New Strong Gravitational Lenses in the DESI Legacy Imaging Surveys

Journal Article · Tue Mar 02 00:00:00 EST 2021 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/abd62b· OSTI ID:1860727

^[1];

^[1]; Gu, A. ^[2]; Ravi, V. ^[1]; Pilon, A. ^[1]; Sheu, W. ^[2]; Venguswamy, R. ^[2]; Banka, S. ^[2];

^[3];

^[4];

^[5];

^[3];

^[6]; Myers, A. D. ^[7]; Sajith, R. ^[2];

^[8];

^[4]

Univ. of San Francisco, CA (United States)
Univ. of California, Berkeley, CA (United States)
National Optical-Infrared Astronomy Research Laboratory, Tucson, AZ (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Toronto, ON (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
Siena College, Loudonville, NY (United States)
Univ. of Wyoming, Laramie, WY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

We have conducted a search for new strong gravitational lensing systems in the Dark Energy Spectroscopic Instrument Legacy Imaging Surveys' Data Release 8. We use deep residual neural networks, building on previous work presented by Huang et al. These surveys together cover approximately one-third of the sky visible from the Northern Hemisphere, reaching a z-band AB magnitude of ~22.5. We compile a training sample that consists of known lensing systems as well as non-lenses in the Legacy Surveys and the Dark Energy Survey. After applying our trained neural networks to the survey data, we visually inspect and rank images with probabilities above a threshold. In this work, we present 1210 new strong lens candidates.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231; KA2401022

OSTI ID:: 1860727

Report Number(s):: LLNL-JRNL-833020; 1050895; TRN: US2305427

Journal Information:: The Astrophysical Journal, Vol. 909, Issue 1; ISSN 0004-637X

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Discovering New Strong Gravitational Lenses in the DESI Legacy Imaging Surveys

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