X-Ray Temperature and Mass Measurements to the Virial Radius of Abell 1413 with Suzaku
X-Ray Temperature and Mass Measurements to the Virial Radius of Abell 1413 with Suzaku
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DOI：
10.1093/pasj/62.2.371
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发表时间：
2010-01
影响因子：
2.3
通讯作者：
A. Hoshino;J. Henry;Kosuke Sato;Hiroki Akamatsu;Wataru Yokota;Shin Sasaki;Y. Ishisaki;T. Ohashi-T
中科院分区：
文献类型：
--
作者：
A. Hoshino;J. Henry;Kosuke Sato;Hiroki Akamatsu;Wataru Yokota;Shin Sasaki;Y. Ishisaki;T. Ohashi-T
我们目前的X射线观测的北方郊区的松弛星系团A1413与朱雀，其XIS仪器具有低固有的背景需要使这些低表面亮度区域的测量。我们使用XMM-牛顿和朱雀星系团的图像切除了15个叠加在图像上的点源，通量为$1\times 10^{-14}$ \fluxunit（2--10 keV）。我们量化所有已知的系统误差作为我们分析的一部分，并显示我们的统计误差包括他们的大部分。我们的结果扩展了以前用Chandra和XMM-Newton测量的结果，并且在维里半径r_{200}$处显示出约3 keV的显著温度下降。我们的熵分布在外部区域（$> 0.5 r_{200}$）光滑地加入到XMM-牛顿，并显示出一个平坦的斜率相比，简单的模型，类似于其他一些观察到的团簇维里半径。在维里半径处，团簇的积分质量约为7.5\times10 ^{14}M_{\odot}$，并且根据用于测量它的特定方法而变化约30%。
We present X-ray observations of the northern outskirts of the relaxed galaxy cluster A1413 with Suzaku, whose XIS instrument has the low intrinsic background needed to make measurements of these low surface brightness regions. We excise 15 point sources superimposed on the image above a flux of $1\times 10^{-14}$ \fluxunit (2--10keV) using XMM-Newton and Suzaku images of the cluster. We quantify all known systematic errors as part of our analysis, and show our statistical errors encompasses them for the most part. Our results extend previous measurements with Chandra and XMM-Newton, and show a significant temperature drop to about 3keV at the virial radius, $r_{200}$. Our entropy profile in the outer region ($> 0.5 r_{200}$) joins smoothly onto that of XMM-Newton, and shows a flatter slope compared with simple models, similar to a few other clusters observed at the virial radius. The integrated mass of the cluster at the virial radius is approximately $7.5\times10^{14}M_{\odot}$ and varies by about 30% depending on the particular method used to measure it.