Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..689p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 198, Feb. 1982, p. 689-706.
Astronomy and Astrophysics
Astronomy
39
Angular Momentum, Astronomical Models, Black Holes (Astronomy), Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Structure, Active Galactic Nuclei, Dynamo Theory, Energy Conservation, Equations Of State, Opacity
Scientific paper
The fact that dynamo-driven disks around stellar-mass black holes are very thin, whereas the supermassive case suggests geometrically thickened disks, may be an interesting asymmetry in the theory. In particular, the production of double beams in thick disk geometries (Lynden-Bell 1978) in quasar or active galactic nuclei environments could be important in the (fluctuations) magnetic pressure bloated supermassive case. Model independent scaling of reconnection experiments to Cyg X-1 and 3C 273 shows that millisecond and shot noise X-ray variability in Cyg X-1 requires fields of 10 to the 13th and 10 to the 10th G respectively, while for 3C 273, shot noise optical variability requires 10 to the 7th G. These fields are orders of magnitude too strong to arise in standard accretion disk models.
Fahlman Gregory G.
Pudritz Ralph E.
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