Soft X-Ray Absorption Due to a Foreground Edge-on Spiral Galaxy toward the Core of A2029
Soft X-Ray Absorption Due to a Foreground Edge-on Spiral Galaxy toward the Core of A2029
复制标题
由于前景边缘螺旋星系朝向 A2029 核心而产生的软 X 射线吸收
DOI：
10.1086/380819
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
E. Blanton
中科院分区：
文献类型：
--
作者：
T. Clarke;J. Usón;C. Sarazin;E. Blanton
我们已经探测到了针对前景星系UZC J151054.6+054313(z=0.0767)的星系团A2029的核心的X射线吸收特征(z=0.0221)。光学观测(B、V、R和I)表明，它是一个倾斜87°±3°的SCD星系。HI观测给出的自转速度为10 8公里S-1，原子氢质量M=3.1×10 9d M☉，其中D90是到银河系的距离，单位为90Mpc。X射线光谱符合钱德拉吸收特征，假设太阳丰度，氢柱密度为(2.0±0.4)×1021厘米-2。如果吸收体均匀地分布在星系盘上，则隐含的氢质量为MH=(6.2±1.2)×10~8d M☉。由于星系中的吸收气体可能集中在星系的中心和盘的中间，这是总氢质量的下限。另一方面，吸收测量表明，UZC J151054.6+054313中的暗物质并不是以相对均匀的扩散气体分布的。
We have detected an X-ray absorption feature against the core of the galaxy cluster A2029 (z = 0.0767) that we identify with the foreground galaxy UZC J151054.6+054313 (z = 0.0221). Optical observations (B, V, R, and I) indicate that it is an Scd galaxy seen nearly edge-on at an inclination of 87° ± 3°. H I observations give a rotation velocity of 108 km s-1 and an atomic hydrogen mass of M = 3.1 × 109d M☉, where d90 is the distance to the galaxy in units of 90 Mpc. X-ray spectral fits to the Chandra absorption feature yield a hydrogen column density of (2.0 ± 0.4) × 1021 cm-2, assuming solar abundances. If the absorber is uniformly distributed over the disk of the galaxy, the implied hydrogen mass is MH = (6.2 ± 1.2) × 108d M☉. Since the absorbing gas in the galaxy is probably concentrated toward the center of the galaxy and the middle of the disk, this is a lower limit to the total hydrogen mass. On the other hand, the absorption measurements imply that the dark matter in UZC J151054.6+054313 is not distributed in a relatively uniform diffuse gas.
影响因子：
8.7
作者：
Bennett, CL;Halpern, M;Weiland, JL
通讯作者：
Weiland, JL