NUMERICAL SIMULATION OF HOT ACCRETION FLOWS II NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS

CORC > 厦门大学 > 物理技术－已发表论文

	NUMERICAL SIMULATION OF HOT ACCRETION FLOWS II NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS
	Yuan, Feng ; Bu, Defu ; Wu, Maochun ; Yuan F(袁峰)
刊名	http://dx.doi.org/10.1088/0004-637X/761/2/130
	2012-12-20
关键词	ADVECTION-DOMINATED ACCRETION ACTIVE GALACTIC NUCLEI BLACK-HOLE BINARIES X-RAY BINARIES RELATIVISTIC MAGNETOHYDRODYNAMIC SIMULATIONS MAGNETICALLY DRIVEN ACCRETION 2 SPACE DIMENSIONS SGR A-ASTERISK SEYFERT-GALAXIES GRO J1655-40
英文摘要	National Basic Research Program of China (973 Program) [2009CB824800]; Natural Science Foundation of China [10833002, 10825314, 11103059, 11121062, 11133005]; CAS/SAFEA; Hydrodynamical (HD) and magnetohydrodynamical (MHD) numerical simulations of hot accretion flows have indicated that the inflow accretion rate decreases inward. Two models have been proposed to explain this result. In the adiabatic inflow-outflow solution (ADIOS), this is because of the loss of gas in the outflow. In the alternative convection-dominated accretion flow model, it is thought that the flow is convectively unstable and gas is locked in convective eddies. We investigate the nature of the inward decrease of the accretion rate using HD and MHD simulations. We calculate various properties of the inflow and outflow such as temperature and rotational velocity. Systematic and significant differences are found. These results suggest that the inflow and outflow are not simply convective turbulence; instead, systematic inward and outward motion (i.e., real outflow) must exist. We have also analyzed the convective stability of MHD accretion flows and found that they are stable. These results favor the ADIOS scenario. We suggest that the mechanisms of producing outflow in HD and MHD flows are the buoyancy associated with the convection and the centrifugal force associated with the angular momentum transport mediated by the magnetic field, respectively. The latter is similar to the Blandford & Payne mechanism but no large-scale open magnetic field is required. We discuss some possible observational applications, including the Fermi bubble in the Galactic center and winds in active galactic nuclei and black hole X-ray binaries.
语种	英语
出版者	ASTROPHYS J
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/91704]
专题	物理技术－已发表论文
推荐引用方式 GB/T 7714	Yuan, Feng,Bu, Defu,Wu, Maochun,et al. NUMERICAL SIMULATION OF HOT ACCRETION FLOWS II NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS[J]. http://dx.doi.org/10.1088/0004-637X/761/2/130,2012.
APA	Yuan, Feng,Bu, Defu,Wu, Maochun,&袁峰.(2012).NUMERICAL SIMULATION OF HOT ACCRETION FLOWS II NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS.http://dx.doi.org/10.1088/0004-637X/761/2/130.
MLA	Yuan, Feng,et al."NUMERICAL SIMULATION OF HOT ACCRETION FLOWS II NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS".http://dx.doi.org/10.1088/0004-637X/761/2/130 (2012).