THE SPECTRA OF ACCRETION DISKS IN ACTIVE GALACTIC NUCLEI

被引:174
|
作者
ROSS, RR
FABIAN, AC
MINESHIGE, S
机构
[1] UNIV CAMBRIDGE,INST ASTRON,CAMBRIDGE CB3 0HA,ENGLAND
[2] IBARAKI UNIV,DEPT PHYS,BUNKYO KU,MITO,IBARAKI 310,JAPAN
关键词
ACCRETION; ACCRETION DISKS; RADIATION MECHANISMS; COMPTON AND INVERSE COMPTON; RADIATIVE TRANSFER; GALAXIES; ACTIVE; NUCLEI; X-RAYS;
D O I
10.1093/mnras/258.1.189
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present fully self-consistent calculations of the spectra emitted by accretion discs in active galactic nuclei. We treat the inner, radiation-pressure-dominated regions of standard alpha-discs. Incoherent Compton scattering and emission/absorption of radiation by hydrogen and helium are included in computing the vertical temperature structure within the disc and the emergent spectrum. Comptonization modifies the EUV/soft X-ray continuum and the He II spectral features. In particular, an important fraction of the emergent luminosity appears in the form of a steep soft X-ray spectrum. We find that the observed UV flux and soft X-ray excess of Mkn 841 are consistent with a face-on accretion disc with alpha = 0.1, surrounding a black hole with M = 2 x 10(7) M. and L = 0.28 L(edd).
引用
收藏
页码:189 / 197
页数:9
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