Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phys...17..193r&link_type=abstract
(Niels Bohr Institut, Teknisk Videnskabelige Forskningsrad, and Nordisk Institut for Teoretisk Atomfysik, Symposium on Quasars a
Astronomy and Astrophysics
Astronomy
116
Astronomical Models, Black Holes (Astronomy), Galactic Nuclei, Quasars, Stellar Mass Accretion, Gravitational Effects, Radiative Transfer, Shock Fronts, Taylor Instability, Thermal Plasmas
Scientific paper
A model is presented whereby quasars are considered as massive black holes in galactic nuclei, and are fuelled by capturing gas or stars from their surroundings. The inflow of matter into the vicinity of quasars and the radiative dynamics of the latter are discussed with reference to matter supply and modes of accretion (disk and quasi-spherical). Attention is given to the flow characteristics of matter streaming from disrupted stars, and the subsequent capture of the matter by a black hole. It is noted that electrons become relativistic and strongly radiative at the final stages of accretion, i.e., before they disappear into the black hole's gravity sink. The radiation is mostly of the synchrotron variety, resulting from Fermi-type processes in shock fronts, or from Rayleigh-Taylor instabilities leading to field amplification. Also considered is a thermal plasma radiative mechanism, resulting from magnetic field strengths on the order of a million Gauss near the focus of accretion.
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