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首页> 外文期刊>The Astrophysical journal >THE INTERACTION BETWEEN RADIO LOBES AND HOT GAS IN THE NEARBY RADIO GALAXIES 3C 285 AND 3C 442A
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THE INTERACTION BETWEEN RADIO LOBES AND HOT GAS IN THE NEARBY RADIO GALAXIES 3C 285 AND 3C 442A

机译：邻近无线电星系3C 285和3C 442A中的无线电波与热气体之间的相互作用

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摘要

We present Chandra observations of two nearby radio galaxies in group environments, 3C 285 and 3C 442A. The host galaxies of both sources are involved in mergers with nearby massive galaxies, and the hot gas in the systems is extended along lines joining the interacting galaxies. Both sources show strong evidence for interactions between the radio lobes and the asymmetrical hot gas. We argue that the structure in the hot gas is independent of the existence of the radio lobes in these systems and further that hot gas shaped by an ongoing massive galaxy merger may play an important role in the dynamics of radio lobes in other objects. For 3C 442A, our observations show that gas is being driven out of both members of the host interacting galaxy pair, and the implied constraints on galaxy velocities are consistent with mildly supersonic motions with respect to the group-scale hot gas. The previously known filamentary radio structure in the center of 3C 442A may be a result of the interaction between hot gas expelled from these galaxies and preexisting radio-emitting plasma. In 3C 285, where there is no ongoing galaxy merger, the powerful radio source is probably having a significant effect on the energetics of the host group.
机译：我们介绍了Chandra在群环境3C 285和3C 442A中对附近两个射电星系的观测。两种来源的宿主星系都与附近的大型星系合并，并且系统中的热气体沿着连接相互作用的星系的线扩展。两种来源均显示出无线电波瓣和不对称热气之间相互作用的有力证据。我们认为，热气中的结构与这些系统中无线电波的存在无关，此外，正在进行的大规模星系合并形成的热气可能在其他物体的无线电波动力学中也起着重要作用。对于3C 442A，我们的观察结果表明，气体从与星体相互作用的主星对的两个成员中被驱出，并且对银河速度的隐含约束与相对于组尺度热气体的轻度超音速运动一致。在3C 442A中心的先前已知的丝状无线电结构可能是从这些星系排出的热气体与预先存在的发射辐射的等离子体之间相互作用的结果。在没有正在进行的星系合并的3C 285中，强大的无线电源可能会对主机组的能量学产生重大影响。

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