Polarization and kinematics in Cygnus A

Details Polarization and kinematics in Cygnus A Polarization and kinematics in Cygnus A

2003-08-22

arxiv.org/abs/astro-ph/0308412v1

Mon.Not.Roy.Astron.Soc.345:L13,2003

Astronomy and Astrophysics

Astrophysics

5 pages, accepted for publication in MNRAS letters

Scientific paper

10.1046/j.1365-8711.2003.07141.x

From optical spectropolarimetry of Cygnus A we conclude that the scattering medium in the ionization cones in Cygnus A is moving outward at a speed of 170+-34 km/s, and that the required momentum can be supplied by the radiation pressure of an average quasar. Such a process could produce a structure resembling the observed ionization cones, which are thought to result from shadowing by a circumnuclear dust torus. We detect a polarized red wing in the [O III] emission lines arising from the central kiloparsec of Cygnus A. This wing is consistent with line emission created close to the boundary of the broad-line region.

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