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 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
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).
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).
