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arXiv 2109.09102astro-ph.HEastro-ph.GA
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完全硬X射线样品中Seyfert Galvanes的喷盘耦合

The Jet-Disk Coupling of Seyfert Galaxies from a Complete Hard X-ray Sample

Xiang Liu, Ning Chang, Zhenhua Han, Xin Wang

摘要:

我们分析了完整硬X射线Seyfert样品中不同子样品的喷流-圆盘耦合,研究了耦合指数及其与吸积率的关系。结果如下:(1)幂律耦合指数的范围从无线电强的Seyfert的接近1(线性相关)到无线电安静的Seyfert的显著小于1。从大源到致密源,耦合指数也呈下降趋势;(2)中到高吸积速率的Seyfers(Eddington比$λ\sim$ 0.001 ~ 0.3)显示出线性喷流-盘耦合,但从近Eddington到超Eddington变浅($λ\sim$ 0.3 ~ 10),前者比后者射电更强;(3)在喷流-圆盘相关中,Seyfert 1 s比Seyfert 2 s稍陡。在线性耦合区,喷流效率与辐射效率之比($η/\varepsilon$)几乎不变,但在低吸积或超吸积区,模型中的$η/\varepsilon$随$λ$变化。我们注意到,吸积主导的活动星系核的放射性活动周期是:从低光度的Seyferts的$λ<0.001$中较弱的喷流-盘耦合,到射电强亮的Seyferts和强射电星系/类星体的$0.001<λ<0.3$中的线性耦合,再到$0.3<λ<10$中较弱的耦合。

英文摘要:

We analyze the jet-disk coupling for different subsamples from a complete hard X-ray Seyfert sample to study the coupling indices and their relation to accretion rate. The results are: (1) the power-law coupling index ranges from nearly unity (linear correlation) for radio-loud Seyferts to significantly less than unity for radio-quiet ones. This declining trend of coupling index also holds from larger sources to compact ones; (2) the Seyferts with intermediate to high accretion rate (Eddington ratio $λ\sim$ 0.001 to 0.3) show a linear jet-disk coupling, but it shallows from near to super Eddington ($λ\sim$ 0.3 to 10), and the former is more radio loud than the latter; (3) the Seyfert 1s are slightly steeper than the Seyfert 2s, in the jet-disk correlation. In the linear coupling regime, the ratio of jet efficiency to radiative efficiency ($η/\varepsilon$) is nearly invariant, but in low accretion or super accretion regime, $η/\varepsilon$ varies with $λ$ in our model. We note that a radio-active cycle of accretion-dominated active galactic nuclei would be: from a weaker jet-disk coupling in $λ<0.001$ for low luminosity Seyferts, to a linear coupling in $0.001<λ<0.3$ for radio-loud luminous Seyferts and powerful radio galaxies/quasars, and to a weaker coupling in $0.3<λ<10$ ones.

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