Further VLB observations of the redshifted H I absorption in AO 0235 + 164

Details Further VLB observations of the redshifted H I absorption in AO 0235 + 164 Further VLB observations of the redshifted H I absorption in AO 0235 + 164

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..466j&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 1, 1979, p. 466-470.

Astronomy and Astrophysics

Astronomy

10

Absorption Spectra, Bl Lacertae Objects, Hydrogen Clouds, Radio Sources (Astronomy), Red Shift, Very Long Base Interferometry, Line Spectra, Neutral Gases, Radial Velocity

Scientific paper

VLB observations of the 932 MHz H I absorption line and continuum of the BL Lacertae object AO 0235 + 164 with projected baselines of 1.8 x 10 to the 7th lambda have failed to reveal any transverse spatial differences between the emitting and absorbing regions. The apparent source size is probably not broadened by scattering in the absorbing region. A 3 rms upper limit of 0.12 km/s to the velocity change of the absorber between 1976 December and 1977 July was set. The corresponding acceleration of less than 1 x 0.001 cm/sq s indicates that the absorbing region is probably more than 3 kpc away from the continuum source.

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