Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 70, Issue -, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psx062
Keywords
galaxies: elliptical and lenticular, cD; gravitational lensing: strong; surveys
Categories
Funding
- FIRST program from the Japanese Cabinet Office
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- Japan Science and Technology Agency (JST)
- Toray Science Foundation
- NAOJ
- Kavli IPMU
- KEK
- ASIAA
- Princeton University
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy Office of Science
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Max Planck Society through the Max Planck Research Group for SHS
- Ministry of Science and Technology in Taiwan [MOST-103-2112-M-001-003-MY3]
- National Natural Science Foundation of China (NSFC) [11603032]
- JSPS KAKENHI [26800093, 15H05892]
- EACOA - East Asia Core Observatories Association
- Academia Sinica Institute of Astronomy and Astrophysics
- National Astronomical Observatory of Japan
- National Astronomical Observatories of the Chinese Academy of Sciences
- Korea Astronomy and Space Science Institute
- Grants-in-Aid for Scientific Research [17K14250, 26800093] Funding Source: KAKEN
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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 similar to 300 definite or probable lenses by the end of the HSC-SSP.
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