The case for diffuse, collisionally ionized interstellar C IV and SI IV below Z = 1 KPC

Details The case for diffuse, collisionally ionized interstellar C IV and SI IV below Z = 1 KPC The case for diffuse, collisionally ionized interstellar C IV and SI IV below Z = 1 KPC

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..577h&link_type=abstract

In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 577-58

Astronomy and Astrophysics

Astrophysics

4

Carbon, Gas Density, Gas Ionization, Interstellar Chemistry, Interstellar Gas, Silicon, Iue, Line Spectra, Ultraviolet Spectra

Scientific paper

The results of a study of highly ionized gas in the galactic disc and disc/halo interface region are presented, based on IUE observations of C IV and Si IV absorption in a specially selected set of 19 co-directional sight-lines to early-type stars. Evidence is presented for a generally distributed, collisionally ionized phase of this gas having a density in the plane of ≡3×10-9cm-3 and a scale height in the range of 1 - 3 kpc. It is shown that the use in a restricted range of sight-line directions in studies such as this may reduce confusion resulting from inhomogeneities in the distribution of the highly ionized medium.

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