AGN feedback in galaxy group 3C 88: cavities, shock, and jet reorientation

AGN feedback in galaxy group 3C 88: cavities, shock, and jet reorientation
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星系群 3C·88 中的 AGN 反馈:空洞、激波和射流重新定向

DOI:
10.1093/mnras/stz229
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发表时间:
2019
影响因子:
4.8
通讯作者:
Edge, Tim
Edge, Tim
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu, Wenhao;Sun, Ming;Nulsen, Paul;Clarke, Tracy;Sarazin, Craig;Forman, William;Gaspari, Massimo;Giacintucci, Simona;Lal, Dharam Vir;Edge, Tim

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我们介绍了深月观测(105ks)的结果,以及新的巨型米波射电望远镜和射电响亮星系群3C-88的活动星系核爆发的甚大阵列数据。该系统显示,在东侧有一个突出的X射线腔,直径为∼50kpc,距离原子核的∼为28kpc。腔的总热为3.8G×1058erg,膨胀X射线泡所需的平均功率为∼2.0x×1043erg S−1。从表面亮度分布中,我们探测到马赫数为1.4x±100.2的激波,与温度跳跃得到的值一致。冲击能估计为1.9×10,59erg。3C-88中的空穴的大小和总焓是已知的星系群中最大的,以及激波能量。东方X射线腔与射电喷流轴不对齐。这一因素与射电形态结合在一起,有力地表明了过去数千万年来喷流的重新定向。洞穴周围明亮的边缘和臂特征显示出金属丰度的增强,这表明它们来自于群中心的高金属度气体,被上升的X射线气泡抬高。OurChandra对3C-88的研究还显示,拥有强大射电活动星系核的星系团可以拥有高空腔功率,尽管通常需要深入的X射线观测来确认星系组中的空洞。
We present results from the deepChandraobservation (105 ks), together with new Giant Metrewave Radio Telescope and Very Large Array data of the AGN outburst in the radio-loud galaxy group 3C 88. The system shows a prominent X-ray cavity on the eastern side with a diameter of ∼50 kpc at ∼28 kpc from the nucleus. The total enthalpy of the cavity is 3.8 × 1058erg and the average power required to inflate the X-ray bubble is ∼ 2.0 × 1043erg s−1. From surface brightness profiles, we detect a shock with a Mach number ofM= 1.4 ± 0.2, consistent with the value obtained from temperature jump. The shock energy is estimated to be 1.9 × 1059erg. The size and total enthalpy of the cavity in 3C 88 are the largest known in galaxy groups, as well as the shock energy. The eastern X-ray cavity is not aligned with the radio jet axis. This factor, combined with the radio morphology, strongly suggests jet reorientation in the last tens of million years. The bright rim and arm features surrounding the cavity show metallicity enhancement, suggesting they originated as high metallicity gas from the group centre, lifted by the rising X-ray bubbles. OurChandrastudy of 3C 88 also reveals that galaxy groups with powerful radio AGN can have high cavity power, although deep X-ray observations are typically required to confirm the cavities in galaxy groups.
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