THE JET HEATED X-RAY FILAMENT IN THE CENTAURUS A NORTHERN MIDDLE RADIO LOBE

THE JET HEATED X-RAY FILAMENT IN THE CENTAURUS A NORTHERN MIDDLE RADIO LOBE
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半人马座北部中射电瓣中的喷射加热 X 射线细丝

DOI:
10.1088/0004-637x/698/2/2036
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发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Kraft R
Kraft R
中科院分区:
--
文献类型:
--
作者:
Kraft R

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我们目前的结果从一个40 ksXMM-牛顿观测的X射线灯丝符合东南边缘的半人马座A北方中射电瓣(NML)。我们发现,X射线灯丝由五个空间分辨的X射线结嵌入在一个连续的漫桥。每个结的光谱很好地拟合的温度范围从0.3至0.7千电子伏和太阳下元素丰度的热模型。在五个节点中的四个节点中,非热模型与光谱的拟合较差,最终排除了同步加速器或IC/CMB机制的发射。结的内部压力超过周围星际介质的压力或NML的均分压力一个数量级以上,这表明它们的寿命很短(103 × 106年)。基于能量的论点,这是不可信的,这些结已被电离的光束流从活动星系核的Cen A或他们已被冲击加热的超音速膨胀的NML。在我们看来,X射线结起源的最可行的方案是,它们是通过与喷流直接相互作用而加热的冷气体冲击的结果。NML最合理的模型是,它是来自先前核爆发的气泡,正在被当前的爆发重新激活。东北方向的内叶和大尺度急流是无损耗的通道,通过这些通道,急流物质快速地向北半球运动。我们还报道了在Cen A周围发现的一个大尺度(至少35 kpc半径)气晕。
We present results from a 40 ks XMM-Newton observation of the X-ray filament coincident with the southeast edge of the Centaurus A Northern Middle Radio Lobe (NML). We find that the X-ray filament consists of five spatially resolved X-ray knots embedded in a continuous diffuse bridge. The spectrum of each knot is well fitted by a thermal model with temperatures ranging from 0.3 to 0.7 keV and subsolar elemental abundances. In four of the five knots, nonthermal models are a poor fit to the spectra, conclusively ruling out synchrotron or IC/CMB mechanisms for their emission. The internal pressures of the knots exceed that of the ambient interstellar medium or the equipartition pressure of the NML by more than an order of magnitude, demonstrating that they must be short lived (∼ 3× 10 6 yr). Based on energetic arguments, it is implausible that these knots have been ionized by the beamed flux from the active galactic nucleus of Cen A or that they have been shock heated by supersonic inflation of the NML. In our view, the most viable scenario for the origin of the X-ray knots is that they are the result of cold gas shock heated by a direct interaction with the jet. The most plausible model of the NML is that it is a bubble from a previous nuclear outburst that is being re-energized by the current outburst. The northeast inner lobe and the large-scale jet are lossless channels through which the jet material rapidly travels to the NML in this scenario. We also report the discovery of a large-scale (at least 35 kpc radius) gas halo around Cen A.
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