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  • 标题:Accretion disk dynamics - α-viscosity in self-similar self-gravitating models
  • 其他标题:α-viscosity in self-similar self-gravitating models
  • 本地全文:下载
  • 作者:Marcus Kubsch ; Marcus Kubsch ; Tobias F. Illenseer
  • 期刊名称:Astronomy & Astrophysics
  • 印刷版ISSN:0004-6361
  • 电子版ISSN:1432-0746
  • 出版年度:2016
  • 卷号:588
  • 页码:1-11
  • DOI:10.1051/0004-6361/201527092
  • 语种:English
  • 出版社:EDP Sciences
  • 摘要:Aims. We investigate the suitability of α-viscosity in self-similar models for self-gravitating disks with a focus on active galactic nuclei (AGN) disks. Methods. We use a self-similar approach to simplify the partial differential equations arising from the evolution equation, which are then solved using numerical standard procedures. Results. We find a self-similar solution for the dynamical evolution of self-gravitating α-disks and derive the significant quantities. In the Keplerian part of the disk our model is consistent with standard stationary α-disk theory, and self-consistent throughout the self-gravitating regime. Positive accretion rates throughout the disk demand a high degree of self-gravitation. Combined with the temporal decline of the accretion rate and its low amount, the model prohibits the growth of large central masses. Conclusions. α-viscosity cannot account for the evolution of the whole mass spectrum of super-massive black holes (SMBH) in AGN. However, considering the involved scales it seems suitable for modelling protoplanetary disks.
  • 关键词:accretion, accretion disks;turbulence;hydrodynamics;methods: analytical
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