New Strong Gravitational Lenses from the DESI Legacy Imaging Surveys Data Release 9
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 (following Huang et al. 2020; Huang et al. 2021, Paper I & II, respectively). These surveys together cover $\sim$ 19,000 deg$^2$ visible from the northern hemisphere, reaching a z-band AB magnitude of $\sim$ 22.5. We use a deep residual neural network, trained on a compilation of known lensing systems and candidates as well as non-lenses in the same footprint. After applying our trained neural networks to the survey data, we visually inspect and rank images with probabilities above a threshold. We have found 1895 lens candidates. Out of these, 1512 are identified for the first time. Combining the discoveries from this work, Paper I (335) and II (1210), the total number of strong lens candidates from the Legacy Surveys that we have discovered is 3057.
- Publication:
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arXiv e-prints
- Pub Date:
- June 2022
- DOI:
- 10.48550/arXiv.2206.02764
- arXiv:
- arXiv:2206.02764
- Bibcode:
- 2022arXiv220602764S
- Keywords:
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- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- 19 pages, 10 figures, 4 tables. arXiv admin note: text overlap with arXiv:2005.04730