Source selection for cluster weak lensing measurements in the Hyper Suprime-Cam survey

PASJ: Publications of the Astronomical Society of Japan

Sifón, Cristóbal¹  Okabe, Nobuhiro²  Tanaka, Masayuki²  Medezinski, Elinor²  Huang, Song³  Speagle, Joshua S³  Umetsu, Keiichi⁴  Miyatake, Hironao⁵  Mandelbaum, Rachel⁶  Murata, Ryoma⁷  Oguri, Masamune⁸  Komiyama, Yutaka⁸  Strauss, Michael A⁸  Leauthaud, Alexie⁸  Simet, Melanie⁹  Nishizawa, Atsushi J^1,10 

[1] Department of Astronomy and Astrophysics, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA;Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA;Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Harvard University, 60 Garden St, Cambridge, MA 02138, USA;Institute for Advanced Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan;Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan;Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA;Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), Tokyo Institutes for Advanced Study, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan;McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA;Research Center for the Early Universe, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

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

DOI  :  10.1093/pasj/psy009

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

We present optimized source galaxy selection schemes for measuring cluster weak lensing (WL) mass profiles unaffected by cluster member dilution from the Subaru Hyper Suprime-Cam Strategic Survey Program (HSC-SSP). The ongoing HSC-SSP survey will uncover thousands of galaxy clusters to z ≲ 1.5. In deriving cluster masses via WL, a critical source of systematics is contamination and dilution of the lensing signal by cluster members, and by foreground galaxies whose photometric redshifts are biased. Using the first-year CAMIRA catalog of ∼900 clusters with richness larger than 20 found in ∼140 deg2 of HSC-SSP data, we devise and compare several source selection methods, including selection in color–color space (CC-cut), and selection of robust photometric redshifts by applying constraints on their cumulative probability distribution function (P-cut). We examine the dependence of the contamination on the chosen limits adopted for each method. Using the proper limits, these methods give mass profiles with minimal dilution in agreement with one another. We find that not adopting either the CC-cut or P-cut methods results in an underestimation of the total cluster mass (13% ± 4%) and the concentration of the profile (24% ± 11%). The level of cluster contamination can reach as high as ∼10% at R ≈ 0.24 Mpc/h for low-z clusters without cuts, while employing either the P-cut or CC-cut results in cluster contamination consistent with zero to within the 0.5% uncertainties. Our robust methods yield a ∼60 σ detection of the stacked CAMIRA surface mass density profile, with a mean mass of M200c = [1.67 ± 0.05(stat)] × 1014 M⊙/h.

【 授权许可】

CC BY