Detection of Lyman continuum absorption in the BL Lacertae object PKS 0735+178

Astronomy and Astrophysics – Astrophysics

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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.

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