Deep Chandra observations of Pictor A
Deep Chandra observations of Pictor A
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钱德拉深部观测图像 A
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
D. M. Worrall
中科院分区：
文献类型：
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作者：
M. Hardcastle;E. Lenc;M. Birkinshaw;J. Croston;J. Croston;J. Goodger;H. Marshall;E. Perlman;A. Siemiginowska;Ł. Stawarz;D. M. Worrall
我们报告深钱德拉观测附近的宽线射电星系绘架A，我们联合收割机与新的澳大利亚望远镜紧凑阵列（ATCA）的意见。新的X射线数据比以前提出的观测多4倍的曝光，跨越15年的时间基线，可以详细研究活动星系核、喷流、热点和叶的空间、时间和光谱特性。我们提出的证据，进一步的时间变化的射流，虽然耀斑，我们在以前的工作中报告仍然是最显着检测到的随时间变化的功能。我们也证实了先前关于微弱反喷流的初步证据。基于射电通过X射线光谱的喷流和它的详细的空间结构，并对反喷流的属性，我们认为，逆康普顿模型可以决定性地拒绝，并提出从喷流的X射线辐射是同步辐射的粒子加速在边界层的相对论喷流。我们第一次发现证据表明，明亮的西部热点在X射线中也是随时间变化的，我们将其与高分辨率射电观测中看到的热点中的小尺度结构联系起来。新的数据使我们能够确认，频谱的瓣是在一个逆康普顿模型的预测很好的协议，我们表明，数据有利于模型中看到的灯丝在无线电图像中的主要是在一个相对均匀的电子分布的存在下的磁场的空间变化的结果。
We report on deep Chandra observations of the nearby broad-line radio galaxy Pictor A, which we combine with new Australia Telescope Compact Array (ATCA) observations. The new X-ray data have a factor of 4 more exposure than observations previously presented and span a 15 yr time baseline, allowing a detailed study of the spatial, temporal and spectral properties of the AGN, jet, hotspot and lobes. We present evidence for further time variation of the jet, though the flare that we reported in previous work remains the most significantly detected time-varying feature. We also confirm previous tentative evidence for a faint counterjet. Based on the radio through X-ray spectrum of the jet and its detailed spatial structure, and on the properties of the counterjet, we argue that inverse-Compton models can be conclusively rejected, and propose that the X-ray emission from the jet is synchrotron emission from particles accelerated in the boundary layer of a relativistic jet. For the first time, we find evidence that the bright western hotspot is also time-varying in X-rays, and we connect this to the small-scale structure in the hotspot seen in high-resolution radio observations. The new data allow us to confirm that the spectrum of the lobes is in good agreement with the predictions of an inverse-Compton model and we show that the data favour models in which the filaments seen in the radio images are predominantly the result of spatial variation of magnetic fields in the presence of a relatively uniform electron distribution.
活动星系的 X 射线喷流
DOI：
10.1007/s00159-008-0016-7
发表时间：
2009
期刊：
The Astronomy and Astrophysics Review
影响因子：
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作者：
Worrall D
通讯作者：
Worrall D