AGN light echoes and the accretion disc self-gravity limit

被引：6
|
作者：
Lobban, Andrew [1 ]
King, Andrew [2 ,3 ,4 ]
机构：
[1] European Space Astron Ctr ESAC, European Space Agcy ESA, Camino Bajo del Castillo S-N, E-28692 Madrid, Spain
[2] Univ Leicester, Sch Phys & Astron, Leicester LE1 7RH, Leics, England
[3] Univ Amsterdam, Astron Inst Anton Pannekoek, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands
[4] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 511卷 / 02期
关键词：
galaxies: active; black hole physics; X-rays: galaxies; ACTIVE GALACTIC NUCLEI; BLACK-HOLE MASS; EMISSION-LINE REGION; X-RAY; REVERBERATION MEASUREMENTS; OPTICAL VARIABILITY; CONTINUUM EMISSION; QUASAR; SWIFT; SIZES;
D O I：
10.1093/mnras/stac155
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Accretion disc theory predicts that an AGN disc becomes self-gravitating and breaks up into stars at an outer radius R-sg similar or equal to 12 light-days, with effectively no free parameter. We present evidence that the longest observed AGN light echoes are all close to 12 d in the AGN rest frames. These observations give a stringent test of the AGN disc theory. Further monitoring should offer insight into the formation angular momentum of the gas forming the disc. For distant AGN, observed lags significantly longer than 12 d give lower limits on their redshifts.
引用
收藏
页码：1992 / 1998
页数：7
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