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arXiv 1012.0312astro-ph.CO
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局部星系群中热气体的压力分布

The pressure profiles of hot gas in local galaxy groups

M. Sun, N. Sehgal, G. M. Voit, M. Donahue, C. Jones, W. Forman, A. Vikhlinin, C. Sarazin

摘要:

最近对南极望远镜(SPT)和阿塔卡马宇宙学望远镜(ACT)的Sunyaev-Zel'dovich(SZ)角功率谱的测量表明,当使用SZ功率谱来约束宇宙学时,理解重子物理的重要性。这是一个挑战,因为在l=3000时,大约一半的SZ功率来自10^13 h^-1 M_sun < M_500 < 1.5x10^14 h^-1 M_sun的低质量系统,这比研究更高质量的系统更困难。我们对Sun等人(2009)的局部星系群样本的热压含量进行了研究。群Y_{sph, 500} - M_500关系与Arnaud等人(2010)推导的团簇关系一致。集团中值压力分布也与Arnaud et al.(2010)推导的星团普遍压力分布一致。考虑到这一点,我们简要地讨论了几种方法,以减轻之间的紧张关系,测量的低SZ功率和SZ模板的预测。

英文摘要:

Recent measurements of the Sunyaev-Zel'dovich (SZ) angular power spectrum from the South Pole Telescope (SPT) and the Atacama Cosmology Telescope (ACT) demonstrate the importance of understanding baryon physics when using the SZ power spectrum to constrain cosmology. This is challenging since roughly half of the SZ power at l=3000 is from low-mass systems with 10^13 h^-1 M_sun < M_500 < 1.5x10^14 h^-1 M_sun, which are more difficult to study than systems of higher mass. We present a study of the thermal pressure content for a sample of local galaxy groups from Sun et al. (2009). The group Y_{sph, 500} - M_500 relation agrees with the one for clusters derived by Arnaud et al. (2010). The group median pressure profile also agrees with the universal pressure profile for clusters derived by Arnaud et al. (2010). With this in mind, we briefly discuss several ways to alleviate the tension between the measured low SZ power and the predictions from SZ templates.

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