Why high-latitude clouds in our Galaxy and the highly redshifted clouds observed in front of QSOs do not belong to the same parent population

Details Why high-latitude clouds in our Galaxy and the highly redshifted clouds observed in front of QSOs do not belong to the same parent population Why high-latitude clouds in our Galaxy and the highly redshifted clouds observed in front of QSOs do not belong to the same parent population

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268l...1w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 268, May 1, 1983, p. L1-L5.

Astronomy and Astrophysics

Astronomy

27

Cosmic Gases, Intergalactic Media, Milky Way Galaxy, Quasars, Ultraviolet Astronomy, Astronomical Spectroscopy, Ionization, Iue, Red Shift, Spectrum Analysis

Scientific paper

International Ultraviolet Explorer observations of high-latitude gas in our Galaxy reveal the presence of both C II and C IV absorption in the spectra of stars with z greater than 2 kpc. On the other hand, C II is generally absent from unbiased samples of QSO redshift sytems with C IV absorption. Comparisons between the equivalent-width distributions of the QSO sample and of the galactic sample (which is suitably corrected for contamination by disk absorption) shows that the probability that the two samples are drawn from the same parent population is less than 1 percent for C II and less than 10 percent for C IV. Thus, contrary to prevailing opinion, it is highly unlikely that gaseous halos comprised of material with properties of the high-latitude gas are responsible for the bulk of known QSO redshift systems. However, gaseous halos with bimodal states of ionization, or in which the ionization state is a unique function of redshift, are compatible with QSO absorption statistics.

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