Cited by 193Galaxies: Formation, Evolution, PhenomenaAstrophysical Phenomena and ObservationsCosmology and Gravitation Theories

CMU DeepLens: deep learning for automatic image-based galaxy–galaxy strong lens finding

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Lanusse, François, Ma, Quanbin, Li, Nan, Collett, Thomas E., Li, Chun-Liang, Ravanbakhsh, Siamak, Mandelbaum, Rachel, Póczos, Barnabás·2018·Monthly Notices of the Royal Astronomical Society

Abstract

Galaxy-scale strong gravitational lensing can not only provide a valuable probe of the dark matter distribution of massive galaxies, but also provide valuable cosmological constraints, either by studying the population of strong lenses or by measuring time delays in lensed quasars. Due to the rarity of galaxy-scale strongly lensed systems, fast and reliable automated lens finding methods will be essential in the era of large surveys such as Large Synoptic Survey Telescope, Euclid and Wide-Field Infrared Survey Telescope. To tackle this challenge, we introduce CMU DeepLens, a new fully automated galaxy–galaxy lens finding method based on deep learning. This supervised machine learning approach does not require any tuning after the training step which only requires realistic image simulations of strongly lensed systems. We train and validate our model on a set of 20 000 LSST-like mock observations including a range of lensed systems of various sizes and signal-to-noise ratios (S/N). We find on our simulated data set that for a rejection rate of non-lenses of 99 per cent, a completeness of 90 per cent can be achieved for lenses with Einstein radii larger than 1.4 arcsec and S/N larger than 20 on individual g-band LSST exposures. Finally, we emphasize the importance of realistically complex simulations for training such machine learning methods by demonstrating that the performance of models of significantly different complexities cannot be distinguished on simpler simulations. We make our code publicly available at https://github.com/McWilliamsCenter/CMUDeepLens.

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Crossref · 10.1093/mnras/stx1665

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Authors
Lanusse, F., Ma, Q., Li, N., Collett, T. E., Li, C.-L., Ravanbakhsh, S., Mandelbaum, R., & Póczos, B.
Affiliations
  • Carnegie Mellon University (US)
  • Argonne National Laboratory (US)
  • University of Portsmouth (GB)
  • School of Computer Science, Carnegie Mellon University, Pittsburgh, PA 15213, USA
Corresponding author
Lanusse, François
Venue
Monthly Notices of the Royal Astronomical Society
Published
2017-07-07
Volume
473
Issue
3
Pages
3895-3906
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2604506260
Cited by
191
References
61
Citations by year
2026: 9 · 2025: 20 · 2024: 24 · 2023: 16 · 2022: 29 · 2021: 24 · 2020: 19 · 2019: 31 · 2018: 14 · 2017: 5
FWCI
10.47
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • Department of Energy (DESC0011114)
  • National Science Foundation under (IIS1563887)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
Keywords
deep learning, mock observations, LSST, lensed quasars, time delay, dark matter distribution, supervised learning, image simulation

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