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arXiv 1104.1086astro-ph.CO
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活动星系核的幕式活动

Episodic Activity in Active Galactic Nuclei

D. J. Saikia, M. Jamrozy, C. Konar, S. Nandi

摘要:

越来越多的证据表明活动星系核的活动可能是间歇性的,具有广泛的时间尺度。射电星系展示出最引人注目的幕式活动的例子,在活动核的相对两侧有两到三对不同的叶。由于辐射损失,早期活动周期的无线电发射预计具有陡峭的无线电频谱,因此在低射频下更容易检测到。逆康普顿散射的宇宙微波背景辐射原则上可以探测到更低洛伦兹因子的粒子,揭示出更古老的粒子群。我们说明的时间尺度的幕式活动,考虑不同的射电星系,讨论的可能性幕式活动的集群无线电源,和一个可能的趋势,高发病率的H{ \sc i}吸收源的证据幕式活动。

英文摘要:

There is increasing evidence to suggest that AGN activity may be episodic, with a wide range of possible time scales. Radio galaxies exhibit the most striking examples of episodic activity, with two or three distinct pairs of lobes on opposite sides of the active nucleus. Radio emission from earlier cycles of activity are expected to have steep radio spectra due to radiative losses, and hence be detected more easily at low radio frequencies. Inverse-Compton scattered cosmic microwave background radiation could in prinicple probe even lower Lorentz-factor particles, revealing an older population. We illustrate the time scales of episodic activity by considering different radio galaxies, discuss the possiblity of episodic activity in cluster radio sources, and a possible trend for a high incidence of H{\sc i} absorption in sources with evidence of episodic activity.

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