A model for the molecular accretion disk and H2O maser in the nucleus of the galaxy NGC 4258

被引：4
|
作者：
Babkovskaya, NS [1 ]
Varshalovich, DA [1 ]
机构：
[1] Russian Acad Sci, Ioffe Physicotech Inst, St Petersburg 194021, Russia
来源：
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS | 2000年 / 26卷 / 03期
基金：
俄罗斯基础研究基金会;
关键词：
active galactic nuclei; quasars; radio galaxies;
D O I：
10.1134/1.20377
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A model is developed for the H2O maser source observed in the circumnuclear region of the galaxy NGC 4258. The maser emission originates at distances of 0.15-0.29 pc from the center in a thin, cold accretion disk (gas-dust torus) rotating around a supermassive black hole of mass 4 x 10(7) M.. The conditions for the emergence of an inverse population of the signal 6(16)-5(23) levels in ortho-H2O working molecules are simulated numerically. The complex line profile, which includes both central and high-velocity components, is calculated. A comparison of the calculations with radiointerferometric and spectrophotometric observations allowed the physical conditions in the emitting region to be determined. (C) 2000 MAIK "Nauka/Interperiodica".
引用
收藏
页码：144 / 152
页数：9
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