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arXiv 0905.0539astro-ph.COastro-ph.HE
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从辐射压修正维里指标观测到的黑洞质量和爱丁顿比的分布

On the observed distributions of black hole masses and Eddington ratios from radiation pressure corrected virial indicators

A. Marconi, D. Axon, R. Maiolino, T. Nagao, P. Pietrini, G. Risaliti, A. Robinson, G. Torricelli

摘要:

应用维里定理的宽线区域的活动星系核允许黑洞质量估计的大样本的对象在所有的红移。在最近的一篇论文中,我们表明,电离辐射压力到BLR云影响维里BH质量估计,我们提供了经验校准的校正。最近,辐射力的重要性的一个新的测试已被提出:MBH-西格玛关系已被用来估计MBH的2型活动星系核的样本和维里关系(有和没有辐射压力)的1型活动星系核的样本从同一个父人口提取。所观察到的L/LEdd分布的维里BH质量的基础上是在很好的协议与MBH-西格玛的基础上,只有当辐射压力的影响是可以忽略不计的,否则观察到显着的差异。在本文中,我们调查的影响相关的维里关系提供MBH的固有色散,我们表明,它们解释了所观察到的L/LEdd分布的类型-1和类型-2活动星系核之间的差异。L/LEdd分布中的这些差异是存在的,而不管辐射力的一般重要性,这必须是可以忽略不计的,只有一小部分的源与大L/LEdd。平均辐射压力校正,然后应适用于维里MBH估计,直到他们的依赖于观测源的物理性质已被完全校准。最后,MBH和L/LEdd分布之间的比较来自sigma为基础的和维里估计可以约束AGN的BLR物理性质的方差。

英文摘要:

The application of the virial theorem to the Broad Line Region of Active Galactic Nuclei allows Black Hole mass estimates for large samples of objects at all redshifts. In a recent paper we showed that ionizing radiation pressure onto BLR clouds affects virial BH mass estimates and we provided empirically calibrated corrections. More recently, a new test of the importance of radiation forces has been proposed: the MBH-sigma relation has been used to estimate MBH for a sample of type-2 AGN and virial relations (with and without radiation pressure) for a sample of type-1 AGN extracted from the same parent population. The observed L/LEdd distribution based on virial BH masses is in good agreement with that based on MBH-sigma only if radiation pressure effects are negligible, otherwise significant discrepancies are observed. In this paper we investigate the effects of intrinsic dispersions associated to the virial relations providing MBH, and we show that they explain the discrepancies between the observed L/LEdd distributions of type-1 and type-2 AGN. These discrepancies in the L/LEdd distributions are present regardless of the general importance of radiation forces, which must be negligible only for a small fraction of sources with large L/LEdd. Average radiation pressure corrections should then be applied in virial MBH estimators until their dependence on observed source physical properties has been fully calibrated. Finally, the comparison between MBH and L/LEdd distributions derived from sigma-based and virial estimators can constrain the variance of BLR physical properties in AGN.

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