A note on bimodal accretion disks

被引:15
作者
Dullemond, CP
Turolla, R
机构
[1] Leiden Observ, NL-2300 RA Leiden, Netherlands
[2] Univ Padua, Dept Phys, I-35131 Padua, Italy
关键词
accretion; accretion disks; black hole physics; hydrodynamics;
D O I
10.1086/305973
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The existence of bimodal disks is investigated. Following a simple argument based on energetic considerations, we show that stationary, bimodal accretion-disk models in which a Shakura-Sunyaev disk (SSD) at large radii matches an advection-dominated accretion flow (ADAF) at smaller radii are never possible using the standard slim-disk approach, unless some extra energy flux is present. The same argument, however, predicts the possibility of a transition from an outer Shapiro-Lightman-Eardley (SLE) disk to an ADAF, and from an SLE disk to an SSD. Both types of solutions have been found. We show that, for any given accretion rate, a whole family of bimodal SLE-ADAF and SLE-SSD solutions can be constructed, each model being characterized by the location of the transition radius.
引用
收藏
页码:361 / 367
页数:7
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