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New Strong Gravitational Lenses from the DESI Legacy Imaging Surveys Data Release 9

Authors :
C. Storfer
X. Huang
A. Gu
W. Sheu
S. Banka
A. Dey
J. Inchausti Reyes
A. Jain
K. J. Kwon
D. Lang
V. Lee
A. Meisner
J. Moustakas
A. D. Myers
S. Tabares-Tarquinio
E. F. Schlafly
D. J. Schlegel
Source :
The Astrophysical Journal Supplement Series, Vol 274, Iss 1, p 16 (2024)
Publication Year :
2024
Publisher :
IOP Publishing, 2024.

Abstract

We have conducted a search for strong gravitational lensing systems in the Dark Energy Spectroscopic Instrument (DESI) Legacy Imaging Surveys Data Release 9. This is the third paper in a series. These surveys together cover ∼19,000 deg ^2 visible from the Northern Hemisphere, reaching a z -band AB magnitude of ∼22.5. We use a deep residual neural network, trained on a compilation of known lensing systems and high-grade candidates as well as nonlenses in the same footprint. After applying our trained neural network to the survey data, we visually inspect and rank images with probabilities above a threshold which has been chosen to balance precision and recall. We have found 1895 lens candidates, of which 1512 are identified for the first time. Combining the discoveries from this work with those from Papers I (335) and II (1210), we have discovered a total of 3057 new candidates in the Legacy Surveys.

Details

Language :
English
ISSN :
15384365 and 00670049
Volume :
274
Issue :
1
Database :
Directory of Open Access Journals
Journal :
The Astrophysical Journal Supplement Series
Publication Type :
Academic Journal
Accession number :
edsdoj.389bd350ade0448d8b57d4bf5f990ad9
Document Type :
article
Full Text :
https://doi.org/10.3847/1538-4365/ad527e