LoCuSS: Testing hydrostatic equilibrium in galaxy clusters

被引：98

作者：

Smith, G. P. ^{[1
]}

Mazzotta, P. ^{[2
]}

Okabe, N. ^{[3
,4
,5
]}

Ziparo, F. ^{[1
]}

Mulroy, S. L. ^{[1
]}

Babul, A. ^{[6
]}

Finoguenov, A. ^{[7
]}

McCarthy, I. G. ^{[8
]}

Lieu, M. ^{[1
]}

Bahe, Y. M. ^{[9
]}

Bourdin, H. ^{[2
]}

Evrard, A. E. ^{[10
,11
,12
]}

Futamase, T. ^{[13
]}

Haines, C. P. ^{[1
,14
,15
]}

Jauzac, M. ^{[16
,17
]}

Marrone, D. P. ^{[14
]}

Martino, R. ^{[2
]}

May, P. E. ^{[1
]}

Taylor, J. E. ^{[18
]}

Umetsu, K. ^{[19
]}

机构：

[1] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[2] Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy

[3] Hiroshima Univ, Dept Phys Sci, Higashihiroshima, Hiroshima 7398526, Japan

[4] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Higashihiroshima, Hiroshima 7398526, Japan

[5] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Todai Inst Adv Study, Kashiwa, Chiba 2778583, Japan

[6] Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada

[7] Univ Helsinki, Dept Phys, FI-00014 Helsinki, Finland

[8] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England

[9] Max Planck Inst Astrophys, D-85748 Garching, Germany

[10] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

[11] Univ Michigan, Michigan Ctr Theoret Phys, Ann Arbor, MI 48109 USA

[12] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[13] Tohoku Univ, Astron Inst, Aoba Ku, Sendai, Miyagi 9808578, Japan

[14] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[15] Univ Chile, Dept Astron, Santiago, Chile

[16] Univ Durham, Inst Computat Cosmol, Durham DH1 3LE, England

[17] Univ KwaZulu Natal, Sch Math Sci, Astrophys & Cosmol Res Unit, ZA-4041 Durban, South Africa

[18] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[19] Acad Sinica, Inst Astron & Astrophys ASIAA, Taipei 10617, Taiwan

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 456卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

gravitational lensing: weak; galaxies: clusters: general; cosmology: observations; COSMOLOGICAL PARAMETER CONSTRAINTS; TELESCOPE LENSING SURVEY; X-RAY; MASS MEASUREMENTS; DENSITY PROFILE; SAMPLE; CALIBRATION; SYSTEMATICS; NEWTON; IV;

D O I：

10.1093/mnrasl/slv175

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We test the assumption of hydrostatic equilibrium in an X-ray luminosity selected sample of 50 galaxy clusters at 0.15 < z < 0.3 from the Local Cluster Substructure Survey (LoCuSS). Our weak-lensing measurements of M500 control systematic biases to sub-4 per cent, and our hydrostatic measurements of the same achieve excellent agreement between XMM-Newton and Chandra. The mean ratio of X-ray to lensing mass for these 50 clusters is beta(X) = 0.95 +/- 0.05, and for the 44 clusters also detected by Planck, the mean ratio of Planck mass estimate to LoCuSS lensing mass is beta(P) = 0.95 +/- 0.04. Based on a careful like-for-like analysis, we find that LoCuSS, the Canadian Cluster Comparison Project, and Weighing the Giants agree on beta(P) similar or equal to 0.9-0.95 at 0.15 < z < 0.3. This small level of hydrostatic bias disagrees at similar to 5 sigma with the level required to reconcile Planck cosmology results from the cosmic microwave background and galaxy cluster counts.

引用

页码：L74 / L78

页数：5

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