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The Galactic halo and local intergalactic medium toward PKS 2155-304Low-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.
Document ID
19930053248
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1086/172656
Authors
Bruhweiler, Frederick C. (Catholic Univ. of America, Washington, United States)
Boggess, A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Norman, Dara J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Grady, C. A. (Catholic Univ. of America, Washington, United States)
Urry, C. M. (Space Telescope Science Inst. Baltimore, MD, United States)
Kondo, Yoji (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
May 20, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 409
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A37245
Distribution Limits
Public
Copyright
Other

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