A large sample of shear-selected clusters from the Hyper Suprime-Cam Subaru Strategic Program S16A Wide field mass maps

PASJ: Publications of the Astronomical Society of Japan

Mitsuishi, Ikuyuki¹  Ota, Naomi²  Shirasaki, Masato³  Miyatake, Hironao⁴  Murayama, Hitoshi⁴  Lin, Yen-Ting⁵  Koike, Michitaro⁶  Miyazaki, Satoshi⁷  Utsumi, Yousuke⁷  Okabe, Nobuhiro⁷  Komiyama, Yutaka⁷  More, Surhud⁷  Hamana, Takashi⁸  Oguri, Masamune⁹  Umetsu, Keiichi⁹  Medezinski, Elinor⁹ 

[1] Core Research for Energetic Universe, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan;Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan;Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan;Institute of Astronomy and Astrophysics, Academia Sinica, Taipei 106, Taiwan;Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa, Chiba 277-8582, Japan;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Research Center for the Early Universe, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;SOKENDAI (The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

关键词: galaxies: clusters: general;    (cosmology:) dark matter;    gravitational lensing: weak;   

DOI  :  10.1093/pasj/psx120

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

We present the result of searching for clusters of galaxies based on weak gravitational lensing analysis of the ∼160 deg2 area surveyed by Hyper Suprime-Cam (HSC) as a Subaru Strategic Program. HSC is a new prime focus optical imager with a 1|${^{\circ}_{.}}$|5-diameter field of view on the 8.2 m Subaru telescope. The superb median seeing on the HSC i-band images of 0|${^{\prime\prime}_{.}}$|56 allows the reconstruction of high angular resolution mass maps via weak lensing, which is crucial for the weak lensing cluster search. We identify 65 mass map peaks with a signal-to-noise (S/N) ratio larger than 4.7, and carefully examine their properties by cross-matching the clusters with optical and X-ray cluster catalogs. We find that all the 39 peaks with S/N > 5.1 have counterparts in the optical cluster catalogs, and only 2 out of the 65 peaks are probably false positives. The upper limits of X-ray luminosities from the ROSAT All Sky Survey (RASS) imply the existence of an X-ray underluminous cluster population. We show that the X-rays from the shear-selected clusters can be statistically detected by stacking the RASS images. The inferred average X-ray luminosity is about half that of the X-ray-selected clusters of the same mass. The radial profile of the dark matter distribution derived from the stacking analysis is well modeled by the Navarro–Frenk–White profile with a small concentration parameter value of c500 ∼ 2.5, which suggests that the selection bias on the orientation or the internal structure for our shear-selected cluster sample is not strong.

【 授权许可】

CC BY