The dynamics of slim disk under the influence of a large-scale ordered magnetic field is investigated.The global solutions show that the radial velocity increases and the disk temperature decreases with enhancing magn...The dynamics of slim disk under the influence of a large-scale ordered magnetic field is investigated.The global solutions show that the radial velocity increases and the disk temperature decreases with enhancing magnetic field.The fraction of mass loss becomes smaller when the accretion rate is higher.The ratio of the jet kinetic power to disk luminosity is less than 0.1,which indirectly supports the argument that radio-loud narrow-line Seyfert 1 galaxies share similarities with blazars.展开更多
We have solved the set of equations for advection-dominated accretion flows(ADAFs)around black holes,and found a new class of global solutions with standing radial shocks.Suchα-X-type shocks may exist in flows when ...We have solved the set of equations for advection-dominated accretion flows(ADAFs)around black holes,and found a new class of global solutions with standing radial shocks.Suchα-X-type shocks may exist in flows when 0≤α<0.05.An example solution is given explicitly,for whichα=0.01 andγ=1.5.The shock position is R_(sh)=8.68R_(g),which is between the inner sonic point R_(s1)=3.88R_(g) and the outer sonic point R_(s2)=85.92R_(g).展开更多
We show that the thermal instability-triggered transition from the state of the Shakura-Sunyaev disc to the state of the advection-dominated accretion flow is possible for black hole accretion flows composed of two-te...We show that the thermal instability-triggered transition from the state of the Shakura-Sunyaev disc to the state of the advection-dominated accretion flow is possible for black hole accretion flows composed of two-temperature plasma with bremsstrahlung and synchrotron radiation and Comptonization.展开更多
We modify the viscosity to disappear inside the sonic point in the advection-dominated accretion flows (ADAF's) around black holes, and obtain the causally connected, physically self-consistent ADAF-thin disk solu...We modify the viscosity to disappear inside the sonic point in the advection-dominated accretion flows (ADAF's) around black holes, and obtain the causally connected, physically self-consistent ADAF-thin disk solutions. Such global solutions differ from previous ones in quantitative details. The results show that the range of variation for the value of the outer boundary Rout is very large, from 30Rg to 106Rg. There is a narrow region for which the rotating motion of the flow is super-Keplerian in each global solution. An example global solution with the causal viscosity is given explicitly, for which R8=2.28Rg and j=1.7564(cRg).展开更多
基金the National Basic Research Program of China under Grant No 2009CB824800the National Natural Science Foundation of China under Grant Nos 11143003,11233006 and 11073015the Natural Science Foundation of Fujian Province(No 2011J01023).
文摘The dynamics of slim disk under the influence of a large-scale ordered magnetic field is investigated.The global solutions show that the radial velocity increases and the disk temperature decreases with enhancing magnetic field.The fraction of mass loss becomes smaller when the accretion rate is higher.The ratio of the jet kinetic power to disk luminosity is less than 0.1,which indirectly supports the argument that radio-loud narrow-line Seyfert 1 galaxies share similarities with blazars.
文摘We have solved the set of equations for advection-dominated accretion flows(ADAFs)around black holes,and found a new class of global solutions with standing radial shocks.Suchα-X-type shocks may exist in flows when 0≤α<0.05.An example solution is given explicitly,for whichα=0.01 andγ=1.5.The shock position is R_(sh)=8.68R_(g),which is between the inner sonic point R_(s1)=3.88R_(g) and the outer sonic point R_(s2)=85.92R_(g).
基金Supported by the National Natural Science Foundation of China under Grant No.10073010.
文摘We show that the thermal instability-triggered transition from the state of the Shakura-Sunyaev disc to the state of the advection-dominated accretion flow is possible for black hole accretion flows composed of two-temperature plasma with bremsstrahlung and synchrotron radiation and Comptonization.
文摘We modify the viscosity to disappear inside the sonic point in the advection-dominated accretion flows (ADAF's) around black holes, and obtain the causally connected, physically self-consistent ADAF-thin disk solutions. Such global solutions differ from previous ones in quantitative details. The results show that the range of variation for the value of the outer boundary Rout is very large, from 30Rg to 106Rg. There is a narrow region for which the rotating motion of the flow is super-Keplerian in each global solution. An example global solution with the causal viscosity is given explicitly, for which R8=2.28Rg and j=1.7564(cRg).
