Precise weak lensing constraints from deep high-resolution Ks images: VLT/HAWK-I analysis of the super-massive galaxy cluster RCS2 J232727.7-020437 at z=0.70

被引：20

作者：

Schrabback, Tim ^{[1
]}

Schirmer, Mischa ^{[2
]}

van der Burg, Remco F. J. ^{[3
,4
]}

Hoekstra, Henk ^{[5
]}

Buddendiek, Axel ^{[1
]}

Applegate, Douglas ^{[1
,6
]}

Bradac, Marusa ^{[7
]}

Eifler, Tim ^{[8
,9
]}

Erben, Thomas ^{[1
]}

Gladders, Michael D. ^{[6
,10
]}

Hernandez-Martin, Beatriz ^{[1
]}

Hildebrandt, Hendrik

Hoag, Austin ^{[7
]}

Klaes, Dominik ^{[1
]}

von der Linden, Anja ^{[11
]}

Marchesini, Danilo ^{[12
]}

Muzzin, Adam ^{[13
]}

Sharon, Keren ^{[14
]}

Stefanon, Mauro ^{[5
]}

机构：

[1] Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany

[2] Southern Operat Ctr, Gemini Observ, Casilla 603, Laserena, Chile

[3] Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France

[4] Univ Paris Diderot, AIM, Sorbonne Paris Cite, CEA,CNRS, F-91191 Gif Sur Yvette, France

[5] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2300 CA Leiden, Netherlands

[6] Univ Chicago, Kavli Inst Cosmol Phys, 5640 South Ellis Ave, Chicago, IL 60637 USA

[7] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[8] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[9] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, 191 W Woodruff Ave, Columbus, OH 43210 USA

[10] Univ Chicago, Dept Astron & Astrophys, 5640 South Ellis Ave, Chicago, IL 60637 USA

[11] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[12] Tufts Univ, Dept Phys & Astron, 574 Boston Ave, Medford, MA 02155 USA

[13] York Univ, Dept Phys & Astron, 4700 Keele St, Toronto, ON MJ3 1P3, Canada

[14] Univ Michigan, Dept Astron, 1085 S Univ Ave, Ann Arbor, MI 48109 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 610卷

基金：

欧洲研究理事会; 美国国家科学基金会; 美国国家航空航天局;

关键词：

gravitational lensing: weak; galaxies: clusters: individual: RCS2 J232727.7-020437; HUBBLE-SPACE-TELESCOPE; GRAVITATIONAL DISTORTIONS; SHAPE MEASUREMENTS; ALL-SKY; SHEAR; INVERSION; COSMOS; MASSES; DISTRIBUTIONS; SYSTEMATICS;

D O I：

10.1051/0004-6361/201731730

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We demonstrate that deep good-seeing VLT/HAWK-I K-s images complemented with g + z-band photometry can yield a sensitivity for weak lensing studies of massive galaxy clusters at redshifts 0.7 less than or similar to z less than or similar to 1.1, which is almost identical to the sensitivity of HST/ACS mosaics of single-orbit depth. Key reasons for this good performance are the excellent image quality frequently achievable for K-s imaging from the ground, a highly effective photometric selection of background galaxies, and a galaxy ellipticity dispersion that is noticeably lower than for optically observed high-redshift galaxy samples. Incorporating results from the 3D-HST and UltraVISTA surveys we also obtained a more accurate calibration of the source redshift distribution than previously achieved for similar optical weak lensing data sets. Here we studied the extremely massive galaxy cluster RCS2 J232727.7-020437 (z = 0.699), combining deep VLT/HAWK-I K-s images (point spread function with a 0''.35 full width at half maximum) with LBT/LBC photometry. The resulting weak lensing mass reconstruction suggests that the cluster consists of a single overdensity, which is detected with a peak significance of 10.1 sigma. We constrained the cluster mass to M-200c/(10(15) M-circle dot) = 2.06(-0.26)(+0.28)(stat.) +/- 0.12(sys.) assuming a spherical Navarro, Frenk & White model and simulation-based priors on the concentration, making it one of the most massive galaxy clusters known in the z greater than or similar to 0.7 Universe. We also cross-checked the HAWK-I measurements through an analysis of overlapping HST/ACS images, yielding fully consistent estimates of the lensing signal.

引用

页数：17