Test of a class of models for the variable absorption lines in AO 0235+164

Details Test of a class of models for the variable absorption lines in AO 0235+164 Test of a class of models for the variable absorption lines in AO 0235+164

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274...86b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 1, 1983, p. 86-100.

Other

5

Absorption Spectra, Astronomical Models, Bl Lacertae Objects, Extragalactic Radio Sources, Intergalactic Media, Interstellar Extinction, Centimeter Waves, Kinematics, Radial Velocity, Radio Spectra, Spectrum Analysis, Very Long Base Interferometry

Scientific paper

A self-consistent kinematic model of the four variable components of the 21-cm absorption line (z = 0.524) in the spectrum of the BL Lac object AO 0235+164 has been constructed. The observed variations in component depth and velocity are attributed to apparent motion of the background continuum source, which is viewed through four absorbing screens. Each screen is characterized by a line depth, a velocity, and a dispersion which vary linearly with x-y position on the sky, but which are time-invariant. Single-dish observations of velocity and absorption depth made by Wolfe, Davis and Briggs with the Arecibo telescope were analyzed and it was found that the two paths deduced independently from velocity data and depth data are nearly coincident; this self-consistency is the strongest evidence for the validity of the model. Other models may also provide acceptable explanations of the line variability. The single-dish observations alone cannot orient or scale the source path in astronomical coordinates although VLBI measurements may be able to do so.

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