Two temperature viscous accretion flows around rotating black holes: Description of under-fed systems to ultra-luminous X-ray sources

Details Two temperature viscous accretion flows around rotating black holes: Description of under-fed systems to ultra-luminous X-ray sources Two temperature viscous accretion flows around rotating black holes: Description of under-fed systems to ultra-luminous X-ray sources

2009-08-27

arxiv.org/abs/0908.3956v2

New Astron. 15: 283-291, 2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

21 pages including 5 figures; few typos corrected; to appear in New Astronomy

Scientific paper

We discuss two temperature accretion disk flows around rotating black holes. As we know that to explain observed hard X-rays the choice of Keplerian angular momentum profile is not unique, we consider the sub-Keplerian regime of the disk. Without any strict knowledge of the magnetic field structure, we assume the cooling mechanism is dominated by bremsstrahlung process. We show that in a range of Shakura-Sunyaev viscosity parameter $0.2\gsim\alpha\gsim0.0005$, flow behavior varies widely, particularly by means of the size of disk, efficiency of cooling and corresponding temperatures of ions and electrons. We also show that the disk around a rotating black hole is hotter compared to that around a Schwarzschild black hole, rendering a larger difference between ion and electron temperatures in the former case. With all the theoretical solutions in hand, finally we reproduce the observed luminosities ($L$) of two extreme cases -- the under-fed AGNs and quasars (e.g. Sgr $A^*$) with $L\gsim 10^{33}$ erg/sec to ultra-luminous X-ray sources with $L\sim 10^{41}$ erg/sec, at different combinations of mass accretion rate, ratio of specific heats, Shakura-Sunyaev viscosity parameter and Kerr parameter, and conclude that Sgr $A^*$ may be an intermediate spinning black hole.

Affiliated with

Also associated with

No associations

Rating

Two temperature viscous accretion flows around rotating black holes: Description of under-fed systems to ultra-luminous X-ray sources does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Two temperature viscous accretion flows around rotating black holes: Description of under-fed systems to ultra-luminous X-ray sources, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two temperature viscous accretion flows around rotating black holes: Description of under-fed systems to ultra-luminous X-ray sources will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-411366