The Effect of a Chandra-measured Merger-related Gas Component on the Lobes of a Dead Radio Galaxy
The Effect of a Chandra-measured Merger-related Gas Component on the Lobes of a Dead Radio Galaxy
复制标题
钱德拉测量的合并相关气体成分对死射电星系波瓣的影响
DOI：
10.1086/513869
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
M. Hardcastle
中科院分区：
文献类型：
--
作者：
D. Worrall;M. Birkinshaw;R. Kraft;M. Hardcastle
我们使用钱德拉的数据来推断，气体的X射线明亮的成分是在分离的过程中的无线电波瓣的3C 442 A。这是第一个射电星系，有令人信服的证据表明，中央气体，相对于叶等离子体，而不仅仅是一个静态的气氛，是有一个重大的动力学影响的无线电结构。我们推测气体的膨胀也通过压缩和绝热加热重新激发了3C 442A叶中的电子。3C 442A的两个特征决定了它的动力学状态。首先，无线电源不再由探测到的活动喷流提供动力，因此无线电等离子体的动态状态受周围介质的支配。其次，两个早期型星系NGC 7236和NGC 7237，其中一个是3C 442A的原始宿主，正在经历合并，并且已经经历了近距离接触，这表明X射线明亮的气体主要是加热的合并星系大气。由于X射线明亮的内部气体的压力驱动的膨胀，叶瓣已经被吹开了约108年。
We use Chandra data to infer that an X-ray-bright component of gas is in the process of separating the radio lobes of 3C 442A. This is the first radio galaxy with convincing evidence that central gas, overpressured with respect to the lobe plasma and not simply a static atmosphere, is having a major dynamical effect on the radio structure. We speculate that the expansion of the gas also reexcites electrons in the lobes of 3C 442A through compression and adiabatic heating. Two features of 3C 442A contribute to its dynamical state. First, the radio source is no longer being powered by a detected active jet, so that the dynamical state of the radio plasma is at the mercy of the ambient medium. Second, the two early-type galaxies, NGC 7236 and NGC 7237, one of which was the original host of 3C 442A, are undergoing a merger and have already experienced a close encounter, suggesting that the X-ray-bright gas is mostly the heated combined galaxy atmospheres. The lobes have been swept apart for ~108 yr by the pressure-driven expansion of the X-ray-bright inner gas.
DOI：
10.1007/978-1-4020-6941-3_8
发表时间：
2008
期刊：
--
影响因子：
--
作者：
Birkinshaw M
通讯作者：
Birkinshaw M