Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249...13b&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 1, 1981, p. 13-16.
Astronomy and Astrophysics
Astrophysics
14
Bl Lacertae Objects, Lyman Spectra, Quasars, Ultraviolet Absorption, Absorption Spectra, Gas Density, Hydrogen Atoms, Iue, Red Shift
Scientific paper
The detection of the Lyman edge in the BL Lac object PKS 0735+178 at the absorption red shift determined by optical measurements leads to a lower limit for the column density of atomic hydrogen, N(H I) not less than 4(17)/sq cm. The Lyman-alpha absorption line appears to have been detected, but only an approximate upper limit can be obtained from the data, of the order of 2(19)/sq cm. This amount of atomic hydrogen is less than that for a line of sight through the disk of a normal spiral galaxy. It is suggested that the absorbing material exists either in the halo of a galaxy or in the tenuous, extended, gaseous disk of a galaxy.
Bregman Joel N.
Glassgold Alfred E.
Huggins Patrick J.
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