A study of the optical and radio absorption-line systems in AO 0235+164

Details A study of the optical and radio absorption-line systems in AO 0235+164 A study of the optical and radio absorption-line systems in AO 0235+164

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218...39w&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 39-52.

Astronomy and Astrophysics

Astronomy

51

Absorption Spectra, Radio Sources (Astronomy), Red Shift, Variable Stars, Centimeter Waves, Hyperfine Structure, Light (Visible Radiation), Spectral Line Width, Ultraviolet Astronomy

Scientific paper

In a study of the two absorption systems in AO 0235+164, the redshift system at z = 0.852 is confirmed and accurate equivalent widths are given for lines in the system at z = 0.524. A study of the optical and 21 cm absorption spectra of the lower redshift gas shows that both types of absorption do not arise in the same line-producing region. While the 21 cm features are formed in a few clouds with a velocity width of about 6 km/s, the optical lines are produced in a 'turbulent' region with a velocity width of about 100 km/s. Three observational tests are suggested for detecting the proposed 'turbulent' region. It is found that present evidence is insufficient to locate the absorbing clouds in AO 0235+164.

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