The X-ray ribs within the cocoon shock of Cygnus A

The X-ray ribs within the cocoon shock of Cygnus A
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天鹅座 A 茧激波内的 X 射线肋骨

DOI:
10.1093/mnras/sty549
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发表时间:
2018
影响因子:
4.8
通讯作者:
Duffy R
Duffy R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Duffy R

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我们使用新的和archivalChandra观测天鹅座A,总计1.9 Ms,调查的分布和温度结构的气体躺在预测范围内的茧冲击,并表现出肋状结构。我们确认,X射线主要是由热发射的平均温度约为4千电子伏,并发现了一个不对称的温度梯度,与西南部的气体冷却器比其余的高达2千电子伏。压力估计表明,该气体是一个位于茧内的单一起源的相干结构,质量约为2 × 1010 M Ω。我们的结论是,气体是碎片造成的冷核心的天鹅座A集群解体后,在目前的活动时代的早期阶段的喷流通过。4keV的气体现在位于较热的茧状边缘的中心内表面上。温度梯度可能是由于在当前无线电活动开启时,星团核心中心与天鹅座A宿主星系之间的偏移造成的。
We use new and archivalChandraobservations of Cygnus A, totalling ∼1.9 Ms, to investigate the distribution and temperature structure of gas lying within the projected extent of the cocoon shock and exhibiting a rib-like structure. We confirm that the X-rays are dominated by thermal emission with an average temperature of around 4 keV, and have discovered an asymmetry in the temperature gradient, with the southwestern part of the gas cooler than the rest by up to 2 keV. Pressure estimates suggest that the gas is a coherent structure of single origin located inside the cocoon, with a mass of roughly 2 × 1010M⊙. We conclude that the gas is debris resulting from disintegration of the cool core of the Cygnus A cluster after the passage of the jet during the early stages of the current epoch of activity. The 4 keV gas now lies on the central inside surface of the hotter cocoon rim. The temperature gradient could result from an offset between the centre of the cluster core and the Cygnus A host galaxy at the switch-on of current radio activity.
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