Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). I. Automatic search for galaxy-scale strong lenses

PASJ: Publications of the Astronomical Society of Japan

Chan, James H H¹  Lee, Chien-Hsiu²  Tanaka, Masayuki³  Shu, Yiping³  Yonehara, Atsunori³  Suyu, Sherry H⁴  Wong, Kenneth C⁴  Sonnenfeld, Alessandro⁴  More, Anupreeta⁵  Bolton, Adam S⁵  Oguri, Masamune⁶  Miyazaki, Satoshi⁷  Jaelani, Anton T⁸  Coupon, Jean⁹  Komiyama, Yutaka^1,10 

[1] Department of Physics, National Taiwan University, 10617 Taipei, Taiwan;Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617 Taiwan;Kavli IPMU (WPI), UTIAS, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan;Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany;National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany;Research Center for the Early Universe, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Subaru Telescope, National Astronomical Observatory of Japan, 650 North A’ohoku Place, Hilo, HI 96720, USA

关键词: galaxies: elliptical and lenticular, cD;    gravitational lensing: strong;    surveys;   

DOI  :  10.1093/pasj/psx062

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

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.

【 授权许可】

CC BY