Medium-resolution far-ultraviolet spectroscopy of PKS 2155-304

Details Medium-resolution far-ultraviolet spectroscopy of PKS 2155-304 Medium-resolution far-ultraviolet spectroscopy of PKS 2155-304

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439l..33a&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 439, no. 2, p. L33-L37

Astronomy and Astrophysics

Astronomy

11

Absorption Spectra, Bl Lacertae Objects, Far Ultraviolet Radiation, Line Spectra, Lyman Alpha Radiation, Ultraviolet Astronomy, Ultraviolet Spectra, Galactic Halos, Intergalactic Media, Interstellar Matter, Oxygen, Red Shift, Spaceborne Astronomy, Ultraviolet Spectroscopy

Scientific paper

Using the Berkeley spectrometer of the Orbiting Retrievable Far and Extreme Ultraviolet Spectrometer (ORFEUS) we observed the 87-117 nm UV spectrum of the BL Lac object PKS 2155-304 with about 0.5 A resolution. In addition to the expected interstellar lines we detected higher quantum number counterparts of the intergalactic Lyman alpha lines discovered earlier with IUE and the Hubble Space Telescope (HST) in the direction of PKS 2155-304. The Lyman discontinuities indicate for three of the redshifted clouds a combined H I column density of 2-5 x 1016/sq cm, while the column density for another cloud appears to be well below 5 x 1015/sq cm. No siginificant O VI absorption in the galactic halo toward PKS 2155-304 could be detected from our data. Assuming that saturation effects are negligible for these weak features, we obtain for the O VI column density toward PKS 2155-304 a 3 sigma upper limit of 2.7 x 1014/sq cm.

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