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Changes in the HI Absorption Line Spectrum of AO 0235+164

Published online by Cambridge University Press:  14 August 2015

Michael M. Davis  and
Arthur M. Wolfe
Michael M. Davis
Affiliation:
Arecibo Observatory
Arthur M. Wolfe
Affiliation:
University of Pittsburgh

Extract

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The BL Lac object AO 0235+164 is an extreme example of a QSO containing a compact, non-thermal energy source which is violently variable. In 1975 it brightened simultaneously at optical and radio frequencies, with a hundred-fold increase in optical brightness on a time scale of a few weeks (Rieke et al. 1976; Ledden, Aller and Dent 1976). During the outburst 0235 was among the most luminous objects in the universe. It exhibits longer term variations at meter wavelengths (Condon and Dennison 1978), and has experienced repeated optical and short wavelength radio outbursts since 1975 (Pica, Smith and Pollock 1979). Very long baseline interferometry shows it to be the most compact known extragalactic radio source.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 97: Extragalactic Radio Sources , 1982 , pp. 311 - 312
Copyright
Copyright © Reidel 1982 

References

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