arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0804.0077astro-ph
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Abell 2052星系团的朱雀观测

Suzaku Observations of the cluster of galaxies Abell 2052

Takayuki Tamura, Kazuhisa Mitsuda, Yoh Takei, Noriko Y. Yamasaki, Akiharu ITOH, Kiyoshi Hayashida, J. Patrick Henry, Hideyo Kunieda, Kyoko Matsushita, Takaya Ohashi

摘要:

本文介绍了朱雀XIS对弛豫星系团Abell 2052的观测结果。偏移指向数据被用来估计银河系前景发射的方向集群。显著的软X射线过量发射高于这一前景,集群内的介质发射,和其他背景成分的光谱和径向确认和解决。这种过剩可以通过(a)已知银河系发射成分的局部变化或(b)温度约为0.2 keV的额外热成分来描述,可能与星团有关。在距离团簇中心\sim 20 in半径(维里半径的60%左右)内测量团簇内介质的径向温度和金属丰度分布。在半径为\sim 15“处,温度径向下降到峰值的0.5-0.6。在观测区域的平均气体质量加权金属丰度被发现是0.21 +- 0.05倍太阳。

英文摘要:

The results from Suzaku XIS observations of the relaxed cluster of galaxies Abell2052 are presented. Offset pointing data are used to estimate the Galactic foreground emission in the direction to the cluster. Significant soft X-ray excess emission above this foreground, the intra-cluster medium emission, and other background components is confirmed and resolved spectroscopically and radially. This excess can be described either by (a) local variations of known Galactic emission components or (b) an additional thermal component with temperature of about 0.2 keV, possibly associated with the cluster. The radial temperature and metal abundance profiles of the intra-cluster medium are measured within \sim 20 in radius (about 60% of the virial radius) from the cluster center . The temperature drops radially to 0.5-0.6 of the peak value at a radius of \sim 15'. The gas-mass-weighted metal abundance averaged over the observed region is found to be 0.21 +- 0.05 times solar.

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