A LARGE-SCALE SHOCK SURROUNDING A POWERFUL RADIO GALAXY?
A LARGE-SCALE SHOCK SURROUNDING A POWERFUL RADIO GALAXY?
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DOI：
10.1088/2041-8205/734/2/l28
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
J. Croston;M. Hardcastle;B. Mingo;D. Evans;D. Evans;D. Dicken;R. Morganti;C. Tadhunter
中科院分区：
文献类型：
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作者：
J. Croston;M. Hardcastle;B. Mingo;D. Evans;D. Evans;D. Dicken;R. Morganti;C. Tadhunter
我们报告钱德拉证据200千秒差距规模的冲击在集群周围的强大的射电星系3C 444。我们的20 KS观测使我们能够确定一个清晰的表面亮度下降周围的射电星系的外缘，这可能是对应于一个球状冲击传播到团内介质。我们测量到在这一下降点上的温度跃变系数为1.7，这对应于马赫数为1.7。这可能是一个低估，因为需要在相当大的区域平均。我们还检测到明确的腔对应的位置的射电叶，这只是第二次这样的检测与FRII射电星系。我们估计，转移到环境中的总能量大于8.2 × 1060 erg，相当于喷流功率大于2.9 × 1045 erg s−1。我们的研究结果表明，从FRII射电星系的能量输入很可能大大超过基于集群腔标度关系的估计。
We report Chandra evidence for a 200 kpc scale shock in the cluster surrounding the powerful radio galaxy 3C 444. Our 20 ks observation allows us to identify a clear surface brightness drop around the outer edge of the radio galaxy, which is likely to correspond to a spheroidal shock propagating into the intracluster medium. We measure a temperature jump across this drop of a factor ∼1.7, which corresponds to a Mach number of ∼1.7. This is likely to be an underestimate due to the need to average over fairly large regions. We also detect clear cavities corresponding to the positions of the radio lobes, which is only the second such detection associated with an FRII radio galaxy. We estimate that the total energy transferred to the environment is >8.2 × 1060 erg, corresponding to a jet power >2.9 × 1045 erg s−1. Our results suggest that energy input from FRII radio galaxies is likely to exceed substantially estimates based on cluster cavity scaling relations.