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arXiv 1201.3540astro-ph.GA
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AGN风和黑洞-银河连接

AGN Winds and the Black-Hole - Galaxy Connection

Kastytis Zubovas, Andrew King

摘要:

在过去的十年中,广角强大的流出活动星系核,无论是在秒差距和千秒差距尺度,已被发现在许多星系。人们普遍怀疑这些外流是将星系中的气体扫空的原因。我们提出的分析模型描述这种外流的传播,并计算其可观察的属性。大尺度活动星系核驱动的外流应该具有动力学光度\sim ηL_Edd/2 \sim 0.05 L_Edd和动量率\sim 20 L_Edd/c,其中L_Edd是中心黑洞的爱丁顿光度,η \sim 0.1是辐射吸积效率。这就产生了一种膨胀的两相介质,其中分子物质与热气共存,在活动星系核中心关闭后,热气仍能继续存在。这幅图预测流出速度\sim为1000 - 1500 km/s,质量流出率可达4000 M_ \odot /yr(kpc尺度),主要由宿主星系速度色散(或相当于黑洞质量)决定。我们将我们的预测与最近的观测数据进行比较,发现非常一致,并建议未来对这一图像进行观测测试。

英文摘要:

During the last decade, wide-angle powerful outflows from AGN, both on parsec and kpc scales, have been detected in many galaxies. These outflows are widely suspected to be responsible for sweeping galaxies clear of their gas. We present the analytical model describing the propagation of such outflows and calculate their observable properties. Large-scale AGN-driven outflows should have kinetic luminosities \sim ηL_Edd/2 \sim 0.05L_Edd and momentum rates \sim 20L_Edd/c, where L_Edd is the Eddington luminosity of the central black hole and η \sim 0.1 its radiative accretion efficiency. This creates an expanding two-phase medium in which molecular species coexist with hot gas, which can persist after the central AGN has switched off. This picture predicts outflow velocities \sim 1000 - 1500 km/s and mass outflow rates up to 4000 M_\odot/yr on kpc scales, fixed mainly by the host galaxy velocity dispersion (or equivalently black hole mass). We compare our prediction with recent observational data, finding excellent agreement, and suggest future observational tests of this picture.

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