Physics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..may.k1402b&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, May 2-5, 1996, abstract #K14.02
Physics
Scientific paper
A wide variety of observations have dealt severe blows to standard geometrically thin, optically thick accretion disk models of quasars and active galactic nuclei. Such models are in great need of revision, and a key ingredient is almost certainly a proper understanding of the roles played by magnetic fields. Such fields are probably crucial to the mass and angular momentum transport, and it appears that they may also be vital in determining the overall spectrum and polarization in the visible, ultraviolet, and X-rays. This is because they can transport a significant fraction of the accretion power out into a corona which then provides a source of external illumination to the optically thick portion of the disk. In addition, equipartition field strengths are sufficiently strong to Faraday depolarize the radiation field out to the ultraviolet. I present theoretical calculations of the spectrum and polarization of magnetized accretion disks and compare them to the observations.
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