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arXiv 0710.1277astro-ph
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根据钱德拉深观测半人马座A喷流和反喷流中粒子加速的新结果

New results on particle acceleration in the Centaurus A jet and counterjet from a deep Chandra observation

M. J. Hardcastle, R. P. Kraft, G. R. Sivakoff, J. L. Goodger, J. H. Croston, A. Jordan, D. A. Evans, D. M. Worrall, M. Birkinshaw, S. Raychaudhury, N. J. Brassi… 展开作者

M. J. Hardcastle, R. P. Kraft, G. R. Sivakoff, J. L. Goodger, J. H. Croston, A. Jordan, D. A. Evans, D. M. Worrall, M. Birkinshaw, S. Raychaudhury, N. J. Brassington, W. R. Forman, W. E. Harris, C. Jones, A. M. Juett, S. S. Murray, P. E. J. Nulsen, C. L. Sarazin, K. A. Woodley

摘要:

我们提出了新的深钱德拉观测半人马座A喷流,与合并源曝光时间为719千秒。这些数据允许沿着喷流进行详细的X射线光谱测量,直到它在距离核4.5 kpc处消失。我们区分几种制度的高能粒子加速:而内部的射流是由结为主,并具有与当地的粒子加速在冲击的属性一致,在外部的3.4千秒差距的射流粒子加速很可能是由一个未知的分布加速机制。除了几个紧凑的反喷流的功能,我们检测到可能的扩展发射从反喷流到2.0千秒差距的核,并认为这意味着扩散加速过程中的反喷流以及操作。对X射线变化的初步研究发现,与M87的情况不同,没有出现具有显著通量密度变化的喷流结。

英文摘要:

We present new deep Chandra observations of the Centaurus A jet, with a combined on-source exposure time of 719 ks. These data allow detailed X-ray spectral measurements to be made along the jet out to its disappearance at 4.5 kpc from the nucleus. We distinguish several regimes of high-energy particle acceleration: while the inner part of the jet is dominated by knots and has properties consistent with local particle acceleration at shocks, the particle acceleration in the outer 3.4 kpc of the jet is likely to be dominated by an unknown distributed acceleration mechanism. In addition to several compact counterjet features we detect probable extended emission from a counterjet out to 2.0 kpc from the nucleus, and argue that this implies that the diffuse acceleration process operates in the counterjet as well. A preliminary search for X-ray variability finds no jet knots with dramatic flux density variations, unlike the situation seen in M87.

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