skip to main content

DOE PAGESDOE PAGES

Title: Fast automated analysis of strong gravitational lenses with convolutional neural networks

Quantifying image distortions caused by strong gravitational lensing—the formation of multiple images of distant sources due to the deflection of their light by the gravity of intervening structures—and estimating the corresponding matter distribution of these structures (the ‘gravitational lens’) has primarily been performed using maximum likelihood modelling of observations. Our procedure is typically time- and resource-consuming, requiring sophisticated lensing codes, several data preparation steps, and finding the maximum likelihood model parameters in a computationally expensive process with downhill optimizers. Accurate analysis of a single gravitational lens can take up to a few weeks and requires expert knowledge of the physical processes and methods involved. Tens of thousands of new lenses are expected to be discovered with the upcoming generation of ground and space surveys. We report the use of deep convolutional neural networks to estimate lensing parameters in an extremely fast and automated way, circumventing the difficulties that are faced by maximum likelihood methods. We also show that the removal of lens light can be made fast and automated using independent component analysis of multi-filter imaging data. Our networks can recover the parameters of the ‘singular isothermal ellipsoid’ density profile, which is commonly used to model strong lensing systems, withmore » an accuracy comparable to the uncertainties of sophisticated models but about ten million times faster: 100 systems in approximately one second on a single graphics processing unit. These networks can provide a way for non-experts to obtain estimates of lensing parameters for large samples of data.« less
Authors:
 [1] ;  [1] ;  [1]
  1. Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology; SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Nature (London)
Additional Journal Information:
Journal Name: Nature (London); Journal Volume: 548; Journal Issue: 7669; Journal ID: ISSN 0028-0836
Publisher:
Nature Publishing Group
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; computational astrophysics; cosmology
OSTI Identifier:
1390590

Hezaveh, Yashar D., Levasseur, Laurence Perreault, and Marshall, Philip J.. Fast automated analysis of strong gravitational lenses with convolutional neural networks. United States: N. p., Web. doi:10.1038/nature23463.
Hezaveh, Yashar D., Levasseur, Laurence Perreault, & Marshall, Philip J.. Fast automated analysis of strong gravitational lenses with convolutional neural networks. United States. doi:10.1038/nature23463.
Hezaveh, Yashar D., Levasseur, Laurence Perreault, and Marshall, Philip J.. 2017. "Fast automated analysis of strong gravitational lenses with convolutional neural networks". United States. doi:10.1038/nature23463. https://www.osti.gov/servlets/purl/1390590.
@article{osti_1390590,
title = {Fast automated analysis of strong gravitational lenses with convolutional neural networks},
author = {Hezaveh, Yashar D. and Levasseur, Laurence Perreault and Marshall, Philip J.},
abstractNote = {Quantifying image distortions caused by strong gravitational lensing—the formation of multiple images of distant sources due to the deflection of their light by the gravity of intervening structures—and estimating the corresponding matter distribution of these structures (the ‘gravitational lens’) has primarily been performed using maximum likelihood modelling of observations. Our procedure is typically time- and resource-consuming, requiring sophisticated lensing codes, several data preparation steps, and finding the maximum likelihood model parameters in a computationally expensive process with downhill optimizers. Accurate analysis of a single gravitational lens can take up to a few weeks and requires expert knowledge of the physical processes and methods involved. Tens of thousands of new lenses are expected to be discovered with the upcoming generation of ground and space surveys. We report the use of deep convolutional neural networks to estimate lensing parameters in an extremely fast and automated way, circumventing the difficulties that are faced by maximum likelihood methods. We also show that the removal of lens light can be made fast and automated using independent component analysis of multi-filter imaging data. Our networks can recover the parameters of the ‘singular isothermal ellipsoid’ density profile, which is commonly used to model strong lensing systems, with an accuracy comparable to the uncertainties of sophisticated models but about ten million times faster: 100 systems in approximately one second on a single graphics processing unit. These networks can provide a way for non-experts to obtain estimates of lensing parameters for large samples of data.},
doi = {10.1038/nature23463},
journal = {Nature (London)},
number = 7669,
volume = 548,
place = {United States},
year = {2017},
month = {8}
}