期刊
ASTROPHYSICAL JOURNAL
卷 699, 期 2, 页码 1178-1195出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/699/2/1178
关键词
cosmology: observations; dark matter; diffuse radiation; galaxies: clusters: general; methods: statistical; surveys; X-rays: galaxies: clusters; X-rays: general
资金
- ESA Member States
- USA (NASA)
- Bundesministerium fur Wirtschaft und Technologie/Deutsches Zentrum fur Luft-und Raumfahrt (BMWI/DLR [FKZ 50 OX 0001]
- DFG [RE 1462/2]
- German BMBF [50 OR 0601]
- BMBF/DLR [50 OR 0207]
- NASA XMM-Newton [NNX06AE76G, NNX08AZ34G, NNX08AW83G]
- Chandra [GO7-8129X]
- NASA [NNX07AV73G, NNX07AT29G]
- NASA [NNX08AW83G, 93820, NNX08AZ34G, 92337] Funding Source: Federal RePORTER
Mahdavi et al. find that the degree of agreement between weak lensing and X-ray mass measurements is a function of cluster radius. Numerical simulations also point out that X-ray mass proxies do not work equally well at all radii. The origin of the effect is thought to be associated with cluster mergers. Recent work presenting the cluster maps showed an ability of X-ray maps to reveal and study cluster mergers in detail. Here, we present a first attempt to use the study of substructure in assessing the systematics of the hydrostatic mass measurements using two-dimensional (2D) X-ray diagnostics. The temperature map is uniquely able to identify the substructure in an almost relaxed cluster which would be unnoticed in the intracluster medium electron number density and pressure maps. We describe the radial fluctuations in the 2D maps by a cumulative/differential scatter profile relative to the mean profile within/at a given radius. The amplitude indicates similar to 10% fluctuations in the temperature, electron number density, and entropy maps, and similar to 15% fluctuations in the pressure map. The amplitude of and the discontinuity in the scatter complement 2D substructure diagnostics, e. g., indicating the most disturbed radial range. There is a tantalizing link between the substructure identified using the scatter of the entropy and pressure fluctuations and the hydrostatic mass bias relative to the expected mass based on the M-Y(X) and M-M(gas) relations particularly at r(500). XMM-Newton observations with similar to 120,000 source photons from the cluster are sufficient to apply our substructure diagnostics via the spectrally measured 2D temperature, electron number density, entropy, and pressure maps.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据