Detection of a pair of prominent X-ray cavities in Abell 3847
Detection of a pair of prominent X-ray cavities in Abell 3847
复制标题
在 Abell 3847 中检测到一对突出的 X 射线腔
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Nanded
中科院分区：
文献类型：
--
作者：
N. Vagshette;S. Naik;M. Patil;Satish S. Sonkamble Physical Research Laboratory;Navrangpura;Ahmedabad School of Physical Sciences;Swami Ramanand Teerth Marathwada University;Nanded
我们展示了对 Abell~3847 星团中明亮的 FR II 射电星系 3C~444 进行深度钱德拉观测的详细分析所获得的结果。从 3C 444 中心沿南北方向检测到一对巨大的 X 射线空腔。星团的 X 射线和射电图像揭示了空腔和射电气泡的特殊位置。射电波瓣和 X 射线腔显然在空间上并不重合，并且沿南北方向分别表现出约 61 kpc 和约 77 kpc 的偏移。径向温度和密度分布揭示了星团中存在冷核心。成像和光谱研究表明射电射流从星团核心去除了大量物质。对温度和密度分布的详细分析表明，星团中存在很少检测到的椭圆激波。在距中心平均距离约 55 kpc 处检测到膨胀空腔意味着中央引擎在约 10^8 年（空腔的估计年龄）内向星团内介质提供了大量无线电功率（约 6.3 X 10^44 erg/s）。该星团的冷却光度估计为~8.30 X 10^43 erg/s，这证实了活动星系核的功率足以淬灭冷却。质量吸积率与爱丁顿率和邦迪率之比估计分别约为 0.08 和 3.5 X 10^4。这表明星团核心的黑洞通过混沌冷吸积来吸积物质。
We present results obtained from a detailed analysis of a deep Chandra observation of the bright FR II radio galaxy 3C~444 in Abell~3847 cluster. A pair of huge X-ray cavities are detected along North and South directions from the centre of 3C 444. X-ray and radio images of the cluster reveal peculiar positioning of the cavities and radio bubbles. The radio lobes and X-ray cavities are apparently not spatially coincident and exhibit offsets by ~61 kpc and ~77 kpc from each other along the North and South directions, respectively. Radial temperature and density profiles reveal the presence of a cool core in the cluster. Imaging and spectral studies showed the removal of substantial amount of matter from the core of the cluster by the radio jets. A detailed analysis of the temperature and density profiles showed the presence of a rarely detected elliptical shock in the cluster. Detection of inflating cavities at an average distance of ~55 kpc from the centre implies that the central engine feeds a remarkable amount of radio power (~6.3 X 10^44 erg/s) into the intra-cluster medium over ~10^8 yr, the estimated age of cavity. The cooling luminosity of the cluster was estimated to be ~8.30 X 10^43 erg/s, which confirms that the AGN power is sufficient to quench the cooling. Ratios of mass accretion rate to Eddington and Bondi rates were estimated to be ~0.08 and 3.5 X 10^4, respectively. This indicates that the black hole in the core of the cluster accretes matter through chaotic cold accretion.
长蛇座 A 星系团的大规模激波
影响因子：
6.5
作者：
Simionescu;Roediger;Nulsen;P. E. J;Brüggen;Forman;Böhringer;H.Werner;Finoguenov
通讯作者：
Finoguenov