论文标题
喷射效率和黑洞的喷射类星体
Jet efficiencies and black hole spins in jetted quasars
论文作者
论文摘要
负责以接近伊德丁顿的速率产生相对论喷射的机制并不理解。简单的理论期望表明，在类星体中的SMBH通过薄碟片增强，这应该产生最弱的喷气机。这与平面无线电类星体（FSRQ）中强大的喷气机的观察相矛盾。我们使用\ emph {fermi}大面积望远镜观察到的伽马射线照明性作为154 FSRQ的射流功率的代理。假设典型的类星体积聚率并使用来自多种方法的黑洞质量测量值，我们发现FSRQ的平均喷射生产效率约为10％，值高达222％。我们发现，这与FSRQ在迅速旋转的黑洞（BHS）周围托管中等薄的磁性积聚盘的FSRQ是一致的。使用一般相对论的磁水动力学（GRMHD）对薄盘的喷气机进行建模，我们发现FSRQ的SMBH旋转的平均下限为$ a_* = 0.59 $，随着黑洞质量的增加，旋转的趋势可以减小。我们的结果与SMBH的合并驱动演变一致。由于高效率而导致的Kerr BHS的当前JET生产模型无法解释3％的样品。在此过程中，我们发现BH质量与$L_γ$之间的相关性可能是Blazar Gamma射线研究中有用的质量估计器。
The mechanisms responsible for the production of relativistic jets from supermassive black holes (SMBHs) accreting at near-Eddington rates are not well-understood. Simple theoretical expectations indicate that SMBHs in quasars accrete via thin discs which should produce at most very weak jets. This is contradicted by observations of powerful jets in flat-spectrum radio quasars (FSRQs). We use gamma-ray luminosities observed with the \emph{fermi} Large Area Telescope as a proxy of the jet power for a population of 154 FSRQs. Assuming typical quasar accretion rates and using black hole mass measurements from a variety of methods, we find a mean jet production efficiency of about 10 per cent for FSRQs, with values as high as 222 per cent. We find that this is consistent with FSRQs hosting moderately thin, magnetically arrested accretion discs around rapidly spinning black holes (BHs). Modeling our observations using general relativistic magnetohydrodynamic (GRMHD) simulations of jets from thin discs, we find an average lower limit of $a_* = 0.59$ for the SMBH spins of FSRQs, with tendency for the spins to decrease as the black hole mass increases. Our results are consistent with the merger-driven evolution of SMBHs. 3 per cent of the sample cannot be explained by current GRMHD models of jet production from Kerr BHs due to the high efficiencies. Along the way, we find a correlation between BH masses and $L_γ$ which may be an useful mass estimator in blazar gamma-ray studies.
