Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483..194c&link_type=abstract
Astrophysical Journal v.483, p.194
Astronomy and Astrophysics
Astronomy
14
Accretion, Accretion Disks, Galaxies: Active, Galaxies: Nuclei, Galaxies: Individual Name: Arp 102B, Line: Profiles, Polarization, Radiative Transfer
Scientific paper
We model the polarization properties of line emission from an accretion disk under a range of assumptions about the source function and electron-scattering optical depth tau es. For small values of tau es and modest viewing angles, polarization can be in excess of the Chandrasekhar result for tau es = ∞. The polarization vector can be either parallel or perpendicular to the projected direction of the disk axis. The polarization properties of the double-peaked H alpha emission line of the broad-line radio galaxy Arp 102B observed by Antonucci, Hurt, & Agol can be understood in terms of electron scattering and line broadening within the line-emitting region if tau es is of order unity, and if the position angle of polarization is parallel to the projected disk axis. The required small tau es is consistent with the hypothesis that the Balmer lines in Arp 102B are produced by photoionization of the disk atmosphere.
Chen Kaiyou
Halpern Jules P.
Titarchuk Lev G.
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