Effects of highenergy particles on accretion flows onto a supermassive black hole
We study the effects of highenergy particles (HEPs) on the accretion flows onto a supermassive black hole and luminosities of escaping particles such as protons, neutrons, gamma rays, and neutrinos. We formulate a onedimensional model of the twocomponent accretion flow consisting of thermal particles and HEPs, supposing that some fraction of the released energy is converted to the acceleration of HEPs. The thermal component is governed by fluid dynamics while the HEPs obey the moment equations of the diffusionconvection equation. By solving the time evolution of these equations, we obtain advectiondominated flows as the steady state solutions. The effects of the HEPs on the flow structures turn out to be small even if the pressure of the HEPs dominates over the thermal pressure. For a model in which the escaping protons take away almost all the energy released, the HEPs have a large enough influence to make the flow have a Keplerian angular velocity at the inner region. We calculate the luminosities of the escaping particles for these steady solutions. The escaping particles can extract the energy from about 10{sup −4} Mdot c{sup 2} to 10{sup −2} Mdot c{sup 2}, where Mdot is the mass accretion rate. The luminosities ofmore »
 Authors:

;
^{[1]};
^{[2]}
 Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka 5600043 (Japan)
 Astronomical Institute, Tohoku University, Sendai 9808578 (Japan)
 Publication Date:
 OSTI Identifier:
 22365309
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Astrophysical Journal; Journal Volume: 791; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ACCRETION DISKS; ANGULAR VELOCITY; BLACK HOLES; DIFFUSION; GALAXIES; GALAXY NUCLEI; GAMMA RADIATION; LUMINOSITY; MATHEMATICAL SOLUTIONS; NEUTRINOS; NEUTRONS; PROTONS; RELATIVISTIC RANGE; STEADYSTATE CONDITIONS