The Galactic halo and local intergalactic medium toward PKS 2155-304

Details The Galactic halo and local intergalactic medium toward PKS 2155-304 The Galactic halo and local intergalactic medium toward PKS 2155-304

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.

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