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arXiv 1003.3020astro-ph.CO
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两个具有强SPT Sunyaev-Zel'dovich效应特征的星系团的XMM-牛顿探测

XMM-Newton detection of two clusters of galaxies with strong SPT Sunyaev-Zel'dovich effect signatures

R. Suhada, J. Song, H. Boehringer, B. A. Benson, J. Mohr, R. Fassbender, A. Finoguenov, D. Pierini, G. W. Pratt, K. Andersson, R. Armstrong, S. Desai

摘要:

本文报道了在X射线中发现的两个星系团:SPT-CL J2332-5358和SPT-CL J2342-5411。这些星团也被南极望远镜通过其Sunyaev-Zel'dovich效应独立探测到,并被布兰科宇宙学巡天在光学波段证实。因此,它们是所有主要聚类搜索方法在调查条件下检测到的第一个聚类。X射线探测是在XMM-BCS星团巡天的框架内进行的,利用了一种新的XMM-Newton镶嵌观测模式。本研究首次科学地运用了这一操作模式。我们估计SPT-CL J2332-5358(红移z=0.32)的X射线光谱温度为T = 9.3(+3.3/-1.9)keV,这意味着它的质量很高,M_{500} = 8.8 +/- 3.8 \times 10^{14} M_{sun}。对于SPT-CL J2342-5411,在z=1.08时,可用的X射线数据不允许我们以良好的置信度直接估计温度。然而,使用我们测量的光度和标度关系,我们估计T = 4.5 +/- 1.3 keV和M_{500} = 1.9 +/- 0.8 \times 10^{14} M_{sun}。我们发现一个很好的协议之间的X射线质量和那些从Sunyaev-Zel'dovich效应估计。

英文摘要:

We report on the discovery of two galaxy clusters, SPT-CL J2332-5358 and SPT-CL J2342-5411, in X-rays. These clusters were also independently detected through their Sunyaev-Zel'dovich effect by the South Pole Telescope, and confirmed in the optical band by the Blanco Cosmology Survey. They are thus the first clusters detected under survey conditions by all major cluster search approaches. The X-ray detection is made within the frame of the XMM-BCS cluster survey utilizing a novel XMM-Newton mosaic mode of observations. The present study makes the first scientific use of this operation mode. We estimate the X-ray spectroscopic temperature of SPT-CL J2332-5358 (at redshift z=0.32) to T = 9.3 (+3.3/-1.9) keV, implying a high mass, M_{500} = 8.8 +/- 3.8 \times 10^{14} M_{sun}. For SPT-CL J2342-5411, at z=1.08, the available X-ray data doesn't allow us to directly estimate the temperature with good confidence. However, using our measured luminosity and scaling relations we estimate that T = 4.5 +/- 1.3 keV and M_{500} = 1.9 +/- 0.8 \times 10^{14} M_{sun}. We find a good agreement between the X-ray masses and those estimated from the Sunyaev-Zel'dovich effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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