RHAPSODY-G simulations: galaxy clusters as baryonic closed boxes and the covariance between hot gas and galaxies

被引：33

作者：

Wu, Hao-Yi ^{[1
]}

Evrard, August E. ^{[1
]}

Hahn, Oliver ^{[2
]}

Martizzi, Davide ^{[3
]}

Teyssier, Romain ^{[4
]}

Wechsler, Risa H. ^{[5
,6
]}

机构：

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

[2] ETH, Dept Phys, CH-8093 Zurich, Switzerland

[3] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[4] Univ Zurich, Inst Computat Sci, CH-8057 Zurich, Switzerland

[5] Stanford Univ, KIPAC, Dept Phys, Stanford, CA 94305 USA

[6] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 452卷 / 02期

基金：

瑞士国家科学基金会;

关键词：

methods: numerical; galaxies: clusters: general; cosmology: theory; X-rays: galaxies: clusters; ADAPTIVE-MESH REFINEMENT; GALACTIC NUCLEUS FEEDBACK; SUPERMASSIVE BLACK-HOLES; K-BAND PROPERTIES; X-RAY; COSMOLOGICAL SIMULATIONS; HYDRODYNAMICAL SIMULATIONS; STATISTICAL SAMPLE; SUNYAEV-ZELDOVICH; MASS-DISTRIBUTION;

D O I：

10.1093/mnras/stv1434

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Within a sufficiently large cosmic volume, conservation of baryons implies a simple 'closed box' view in which the sum of the baryonic components must equal a constant fraction of the total enclosed mass. We present evidence from RHAPSODY-G hydrodynamic simulations of massive galaxy clusters that the closed-box expectation may hold to a surprising degree within the interior, non-linear regions of haloes. At a fixed halo mass, we find a significant anti-correlation between hot gas mass fraction and galaxy mass fraction (cold gas + stars), with a rank correlation coefficient of -0.69 within R-500c. Because of this anti-correlation, the total baryon mass serves as a low-scatter proxy for total cluster mass. The fractional scatter of total baryon fraction scales approximately as 0.02(Delta(c)/100)(0.6), while the scatter of either gas mass or stellar mass is larger in magnitude and declines more slowly with increasing radius. We discuss potential observational tests using cluster samples selected by optical and hot gas properties; the simulations suggest that joint selection on stellar and hot gas has potential to achieve 5 per cent scatter in total halo mass.

引用

页码：1982 / 1991

页数：10

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