AN ACTIVE GALACTIC NUCLEUS DRIVEN SHOCK IN THE INTRACLUSTER MEDIUM AROUND THE RADIO GALAXY 3C 310
AN ACTIVE GALACTIC NUCLEUS DRIVEN SHOCK IN THE INTRACLUSTER MEDIUM AROUND THE RADIO GALAXY 3C 310
复制标题
射电星系 3C 310 周围星团内介质中活跃的星系核驱动的冲击
DOI：
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
S. Murray
中科院分区：
文献类型：
--
作者：
R. Kraft;M. Birkinshaw;P. Nulsen;D. Worrall;J. Croston;W. Forman;M. Hardcastle;C. Jones;S. Murray
我们目前的结果，从57.6 KS钱德拉观测与胖双射电星系3C 310的气体团。我们发现在南部射电瓣外的气体中存在一个表面亮度不连续性，我们将其归因于由该瓣距核180 kpc的超音速膨胀驱动的激波。模拟表面亮度/密度跃变，激波的马赫数为1.5-1.9，这取决于对密度分布和能量输入性质的假设。图像中没有足够的计数来最终检测与电击相关的温度跳变。其总机械能为5 × 1060 erg。假设一个马赫数为1.9的激波，爆发的年龄是1.1亿年，爆发的时间平均功率是1.3 × 1045 erg s-1。能量输入是激波半径内气体辐射损失的100倍。最重要的是，由于熵增加而产生的等效热输入大约是气体热能到激波半径的10%。3C 310是另一个例子，其中占空比为0.1的观测强度的定期爆发可以抵消邦迪半径附近气体的辐射损失并调节反馈。我们还探测到一个凉爽的X射线臂沿着东部边缘的南部无线电波瓣。这个旋臂很可能是由射电等离子体膨胀时产生的低熵气体组成的，与M87的特征相似。
We present results from a 57.6 ks Chandra observation of the cluster gas associated with the fat-double radio galaxy 3C 310. We find a surface brightness discontinuity in the gas outside the southern radio lobe that we attribute to a shock driven by the supersonic inflation of this lobe ∼180 kpc from the nucleus. Modeling the surface brightness/density jump, the shock has Mach number 1.5–1.9, depending on the assumptions one makes about the density profile and the nature of the energy input. There are not sufficient counts in the image to detect conclusively the temperature jump associated with the shock. The total mechanical energy of the outburst is 5 × 1060 erg. Assuming a Mach 1.9 shock, the age of the outburst is ∼100 million yrs, and the time-averaged power of the outburst is ∼1.3 × 1045 erg s−1. The power input is 100 times greater than the radiative losses of the gas within the radius of the shock. Most importantly, the equivalent heat input due to the entropy increase is roughly 10% of the thermal energy of the gas to the radius of the shock. 3C 310 is another example where regular outbursts of the observed strength with a duty cycle of 0.1 could offset the radiative losses of the gas near the Bondi radius and regulate feedback. We also detect a cool filamentary X-ray arm along the eastern periphery of the southern radio lobe. This arm is probably composed of low-entropy gas dredged up in the inflation of the radio plasma, similar to features seen in M87.
DOI：
10.1111/j.1365-2966.2008.13162.x
发表时间：
2008-02
影响因子：
4.8
作者：
J. Croston;M. Hardcastle;M. Birkinshaw;D. Worrall;R. Laing
通讯作者：
J. Croston;M. Hardcastle;M. Birkinshaw;D. Worrall;R. Laing