Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..199b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 199-204.
Astronomy and Astrophysics
Astrophysics
27
Bl Lacertae Objects, Galactic Halos, Intergalactic Media, Lyman Alpha Radiation, Quasars, Red Shift, Absorption Spectra, Hubble Space Telescope, Ionized Gases, Iue, Line Spectra
Scientific paper
Low-resolution UV observations of the bright, low-redshift BL Lac object PKS 2155-304 have been obtained by the HST's high-resolution spectrograph. Attention is here given to results on the number of intergalactic H I Ly-alpha components in the line-of-sight toward this object. The highest-redshift of the observed Ly-alpha systems furnishes a lower limit on the distance of the BL Lac object; this distance is consistent with the approximate redshift deduced from CCD imagery of the probable host galaxy for PKS 2155-304.
Boggess Albert
Bruhweiler Frederick C.
Grady Carol A.
Kondo Yoji
Norman Dara J.
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