The role of the outer boundary condition in accretion disk models: Theory and application
Yuan, F; Peng, QH; Lu, JF; Wang, JM; Wang JM(王建民)
刊名ASTROPHYSICAL JOURNAL
2000
卷号537期号:1页码:#REF!
关键词accretion, accretion disks black hole physics galaxies : active Galaxy : center hydrodynamics radiation mechanisms : thermal
学科分类Astronomy & Astrophysics
DOI10.1086/309020
通讯作者Yuan, F (reprint author), Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China.
文章类型Article
英文摘要In a previous paper, we find that the outer boundary conditions (OBCs) of an optically thin accretion flow play an important role in determining the structure of the flow. Here in this paper, we further investigate the influence of OBCs on the dynamics and radiation of the accretion how on a more detailed level. Bremsstrahlung and synchrotron radiations amplified by Comptonization are taken into account, and two-temperature plasma assumption is adopted. The three OBCs we adopted are the temperatures of the electrons and ions and the specific angular momentum of the accretion flow at a certain outer boundary. We investigate the individual role of each of the three OBCs on the dynamical structure and the emergent spectrum. We find that when the general parameters such as the mass accretion rate M and the viscous parameter alpha are fixed the peak flux at various bands such as radio, IR, and X-ray can differ by as much as several orders of magnitude under different OBCs in our example. Our results indicate that the OBC is both dynamically and radiatively important and therefore should be regarded as a new "parameter" in accretion disk models. As an illustrative example, we further apply the above results to the compact radio source Sgr A* located at the center of our Galaxy. The advection-dominated accretion flow (ADAF) model has turned out to be a great success in explaining its luminosity and spectrum. However, there exists a discrepancy between the mass accretion rate favored by ADAF models in the literature and that favored by the three-dimensional hydrodynamical simulation, with the former being 10-20 times smaller than the latter. By seriously considering the outer boundary condition of the accretion flow, we find that because of the low specific angular momentum of the accretion gas the accretion in Sgr A* should belong to a new accretion pattern, which is characterized by the possession of a very large sonic radius. This accretion pattern can significantly reduce the discrepancy between the mass accretion rates. We argue that the accretion occurred in some detached binary systems; the core of nearby elliptical galaxies and active galactic nuclei very possibly belongs to this accretion pattern.
类目[WOS]Astronomy & Astrophysics
收录类别SCI
WOS记录号WOS:000088371000020
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被引频次:25[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/227115
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
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Yuan, F,Peng, QH,Lu, JF,et al. The role of the outer boundary condition in accretion disk models: Theory and application[J]. ASTROPHYSICAL JOURNAL,2000,537(1):#REF!.
APA Yuan, F,Peng, QH,Lu, JF,Wang, JM,&王建民.(2000).The role of the outer boundary condition in accretion disk models: Theory and application.ASTROPHYSICAL JOURNAL,537(1),#REF!.
MLA Yuan, F,et al."The role of the outer boundary condition in accretion disk models: Theory and application".ASTROPHYSICAL JOURNAL 537.1(2000):#REF!.
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