Hot One-Temperature Accretion Flows around Black Holes

Abstract

view Abstract Citations (77) References (43) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Hot One-Temperature Accretion Flows around Black Holes Esin, Ann A. ; Narayan, Ramesh ; Ostriker, Eve ; Yi, Insu Abstract We describe hot, optically thin solutions for one-temperature accretion disks around black holes. We include cooling by synchrotron, bremsstrahlung, and Comptonization. Our solutions are thermally and viscously stable, with gas temperatures on the order of T ∼ 109-1010.7.7 K. The thermal stability is a direct result of the inclusion of synchrotron cooling. The new solution branch is related to the advection-dominated solution for a two-temperature gas, described by Narayan & Yi (1995b). It is present only for mass accretion rates less than some critical Mdotcrit, which depends on the radius R and viscosity parameter α. The solutions are advection dominated for extremely low values of Mdot. However, for a range of intermediate accretion rates, the new solutions are both hot (T 1010 K) and cooling dominated. Because of this new feature, one-temperature solutions are significantly more luminous than the corresponding two-temperature solutions at the same Mdot. The radial profile of the new solutions is unusual. The inner parts of the flow are cooling-dominated and have a disklike geometry, while the outer parts are fully advection-dominated and nearly quasi-spherical. Publication: The Astrophysical Journal Pub Date: July 1996 DOI: 10.1086/177421 arXiv: arXiv:astro-ph/9601074 Bibcode: 1996ApJ...465..312E Keywords: ACCRETION; ACCRETION DISKS; BLACK HOLE PHYSICS; RADIATION MECHANISMS: NONTHERMAL; Astrophysics E-Print: 24 pages tex file and 7 postscript figures all included in one compressed tar file. Accepted for publication in ApJ. In case of problems, write to aidle@cfa160.harvard.edu full text sources arXiv | ADS | data products SIMBAD (3)