A New Parameter in Accretion Disk Model

@article{Yuan2000ANP,
  title={A New Parameter in Accretion Disk Model},
  author={Fenge Yuan},
  journal={arXiv: Astrophysics},
  year={2000},
  volume={254},
  pages={275-280}
}
  • F. Yuan
  • Published 3 February 2000
  • Physics
  • arXiv: Astrophysics
Taking optically thin accretion flows as example, we calculate the dynamics and the emergent spectra of accretion flows with different outer boundary conditions (OBCs) and find that OBC plays an important role in accretion disk model. This is because the accretion equations describing the behavior of accretion flows are a set of differential equations, therefore, accretion is intrinsically an initial-value problem. We argue that optically thick accretion flow should also show OBC-dependent… 

References

SHOWING 1-10 OF 13 REFERENCES
Accretion Flows: The Role of the Outer Boundary Condition
We investigate the influences of the outer boundary conditions on the structure of an optically thin accretion flow. We find that the outer boundary condition plays an important role in determining
Spectral Models of Advection-dominated Accretion Flows with Winds
We calculate spectral models of advection-dominated accretion flows, taking into account the possibility that significant mass may be lost to an outflow/wind. We apply the models to the soft X-ray
Slim Accretion Disks
In a recent paper, Abramowicz, Czerny, Lasota and Szuszkiewicz (1988) have found a new branch of equilibrium solutions for stationary accretion discs around black holes. These solutions correspond to
Advection-Dominated Accretion Model of Sagittarius A ∗ : Evidence for a Black Hole at the Galactic Center
Sagittarius A*, which is located at the Galactic center, is a puzzling source. It has a mass of M = (2.5 ± 0.4) × 106 M☉, which makes it an excellent black hole candidate. Observations of stellar
Global Structure and Dynamics of Advection-dominated Accretion Flows around Black Holes
We present global solutions that describe advection-dominated accretion flows around black holes. The solutions are obtained by solving numerically a set of coupled ordinary differential equations
The structure and stability of transonic accretion disks surrounding black holes
Stationary transonic alpha-viscosity models of accretion disks surrounding nonrotating black holes have been investigated. The viscosity is modified such that it vanishes in the supersonic region to
Hydrodynamical accretion onto sagittarius A* from distributed point sources
Spectral and kinematic studies suggest that the nonthermal radio source Sgr A*, located at the center of the Milky Way, is a supermassive compact object with a mass ~(2-3) × 106 M☉. Winds from nearby
Explaining the spectrum of Sagittarius A* with a model of an accreting black hole
THE radio source at the centre of our Galaxy1, Sagittarius A* (Sgr A*), seems to be a low-luminosity version of active galactic nuclei—a massive black hole that is accreting gas from the surrounding
Advection-dominated Accretion: Global Transonic Solutions
We obtained global transonic solutions representing optically thin advection-dominated accretion flow by solving the full set of differential equations describing such systems. We found that far from
Hard X-Ray-emitting Black Hole Fed by Accretion of Low Angular Momentum Matter
Observed spectra of active galactic nuclei and luminous X-ray binaries in our Galaxy suggest that both hot (~109 K) and cold (~106 K) plasma components exist close to the central accreting black
...
1
2
...