Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). I. Automatic search for galaxy-scale strong lenses
Year: 2017
Type: article
Abstract: The Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) is an excellent survey for the search for strong lenses, thanks to its area, image quality, and depth. We use three different methods to look for lenses among 43000 luminous red galaxies from the Baryon Oscillation Spectroscopic Survey (BOSS) sample with photometry from the S16A internal data release of the HSC-SSP. The first method is a newly developed algorithm, named YattaLens, which looks for arc-like features around massive galaxies and then estimates the likelihood of an object being a lens by performing a lens model fit. The second method, Chitah, is a modeling-based algorithm originally developed to look for lensed quasars. The third method makes use of spectroscopic data to look for emission lines from objects at a different redshift from that of the main galaxy. We find 15 definite lenses, 36 highly probable lenses, and 282 possible lenses. Among the three methods, YattaLens, which was developed specifically for this study, performs best in terms of both completeness and purity. Nevertheless, five highly probable lenses were missed by YattaLens but found by the other two methods, indicating that the three methods are highly complementary. Based on these numbers, we expect to find ∼300 definite or probable lenses by the end of the HSC-SSP.
DOI: 10.1093/pasj/psx062
Authors: Alessandro Sonnenfeld, James H H Chan, Yiping Shu, Anupreeta More, Masamune Oguri, Sherry H Suyu, Kenneth C Wong, Chien-Hsiu Lee, Jean Coupon, Atsunori Yonehara, Adam S Bolton, Anton T Jaelani, Masayuki Tanaka, Satoshi Miyazaki, Yutaka Komiyama
Institutions: Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, Institute of Astronomy and Astrophysics, Academia Sinica, National Taiwan University, Max Planck Institute for Astrophysics, Academia Sinica, Chinese Academy of Sciences, National Astronomical Observatories, Research Center for the Early Universe, Technical University of Munich, National Astronomical Observatory of Japan, University of Geneva, Kyoto Sangyo University, Tohoku University, The Graduate University for Advanced Studies, SOKENDAI
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, Alfred P. Sloan Foundation, Yale University, Vanderbilt University, Princeton University, Ohio State University, Harvard University, University of Washington, Johns Hopkins University, Carnegie Mellon University, University of Portsmouth, New Mexico State University, York University, Ministry of Education, Culture, Sports, Science and Technology, National Natural Science Foundation of China, Academia Sinica, Chinese Academy of Sciences, Cabinet Office, Government of Japan, Korea Astronomy and Space Science Institute, Max-Planck-Gesellschaft, Ministry of Science and Technology, Israel, National Astronomical Observatory of Japan, High Energy Accelerator Research Organization, East Asian Core Observatories Association, Toray Science Foundation, Office of Science, College of Engineering, Michigan State University, Japan Society for the Promotion of Science, Japan Science and Technology Agency, Brookhaven National Laboratory, Lawrence Berkeley National Laboratory
OpenAlex ID: W2609792901