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, A. Jain, J. Kwon, D. Lang, V. Lee, A. Meisner, J. Moustakas, A. D. Myers, S. Tabares-Tarquinio, E. F. Schlafly, D. J. Schlegel
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.
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