ASCA Observations of the Temperature Structure and Metal Distribution in the Perseus Cluster of Galaxies
ASCA Observations of the Temperature Structure and Metal Distribution in the Perseus Cluster of Galaxies
复制标题
ASCA 对英仙座星系团温度结构和金属分布的观测
DOI：
10.1093/pasj/53.4.595
复制
发表时间：
2001
影响因子：
2.3
通讯作者：
R. Shibata
中科院分区：
文献类型：
--
作者：
H. Ezawa;N. Yamasaki;T. Ohashi;Y. Fukazawa;M. Hirayama;H. Honda;T. Kamae;K. Kikuchi;R. Shibata
利用ASCA卫星上的地理信息系统（GIS）对英仙座星系团进行了多点观测，研究了该星系团的热气体温度和铁丰度的大尺度分布。在离团中心20 °半径范围内，能谱需要两个温度分量，冷分量的温度为kT ~ 2keV，热分量的温度向中心方向明显下降，从8 keV下降到6 keV。在星系团的外部区域，温度显示出幅度约为2 keV的波动，这表明距离星系团中心约16 °的西部区域相对较热。至于Fe丰度，随着半径的增加，从中心的0.44太阳到50 °偏移区域的0.1太阳，检测到显著的下降。如果由于共振散射效应，在距中心4 °以内观测到的Fe-K线强度被抑制2倍，则校正后的
Large-scale distributions of hot-gas temperature and Fe abundance in the Perseus cluster have been studied with multi-pointing observations by the GIS instrument onboard ASCA. Within a radius of 20 � from the cluster center, the energy spectra requires two temperature components, in which the cool component indicates kT ∼2keV and the hot-component temperature shows a significant decline from about 8 keV to 6 keV toward the center. In the outer region of the cluster, the temperature shows a fluctuation with an amplitude of about 2 keV, which suggest that a western region at ∼ 16 � from the cluster center is relatively hotter. As for the Fe abundance, a significant decline with radius is detected from 0.44 solar at the center to ∼ 0.1 solar at a 50 � offset region. If the observed Fe-K line intensity within 4 � from the center is suppressed by a factor of 2 due to the resonance scattering effect, the corrected
K.Kikuchi：“ASCA 测量三个簇中的金属丰度和温度分布：A4059、MKW 3s 和 2A 0335 096”Publ.Astr.Soc.Japan。
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--