Physics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ncimc...7..689b&link_type=abstract
(Convegno Nazionale di Fisica Cosmica, 2nd, L'Aquila, Italy, May 29-June 1, 1984) Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol
Physics
2
Accretion Disks, Angular Velocity, Gravitational Collapse, Kepler Laws, Magnetic Fields, X Rays, Buoyancy, Cosmic Rays, Dynamo Theory, Radial Velocity, Thermodynamic Equilibrium
Scientific paper
The structure and energetics of accretion disks around collapsed objects are examined without the asumption of a Keplerian field. The approach used here is based on the fact that the disk structure is closely related to the balance between the magnetic energy produced by dynamo action and the rotational energy associated with the accreting flow. From this balance and the conservation laws, the angular-velocity field, the radial velocity field, and the magnetic-energy distribution inside the disk are derived analytically. Since no a priori rotational field is assumed, the overall disk structure, not only the angular-velocity distribution, is determined by the basic constraint involving the magnetic-field amplification together with the conservation laws. A limit to the magnetic-field amplification is resonably imposed by the equipartition with the velocity field.
Belvedere Gaetano
Molteni Diego
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