From thin to thick: The impact of X-ray irradiation on accretion disks in active galactic nuclei

被引：16

作者：

Chang, Philip

Quataert, Eliot

Murray, Norman

机构：

[1] Univ Calif Berkeley, Theoret Astrophys Ctr, Dept Astron, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Miller Inst Basic Inst, Berkeley, CA 94720 USA

[3] Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 662卷 / 01期

关键词：

accretion; accretion disks; dust; extinction; galaxies : active; galaxies : nuclei; galaxies : Seyfert;

D O I：

10.1086/517960

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We argue that the X-ray and UV flux illuminating the parsec-scale accretion disk around luminous active galactic nuclei (AGNs) is super-Eddington with respect to the local far-infrared dust opacity. The far-infrared opacity may be larger than in the interstellar medium of the Milky Way due to a combination of supersolar metallicity and the growth of dust grains in the dense accretion disk. Because of the irradiating flux, the outer accretion disk puffs up with a vertical thickness h similar to R. This provides a mechanism for generating a geometrically thick obscuring region from an intrinsically thin disk. We find obscuring columns similar to 10(22)-10(23) cm(-2), in reasonable agreement with observations.

引用

页码：94 / 101

页数：8

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