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
收藏
页码：94 / 101
页数：8
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