The distribution of interstellar AL III away from the Galactic plane

Details The distribution of interstellar AL III away from the Galactic plane The distribution of interstellar AL III away from the Galactic plane

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..107s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Sept. 20, 1990, p. 107-115.

Astronomy and Astrophysics

Astronomy

34

Absorption Spectra, Abundance, Aluminum, Interstellar Matter, Ultraviolet Astronomy, Iue, Line Spectra, Spatial Distribution, Ultraviolet Spectra

Scientific paper

IUE spectra are analyzed to study the density distribution of interstellar Al III away from the Galactic plane. In most cases, the measured values of the relative line strengths are consistent with only modest levels of line saturation. Al III is found to have an exponential scale height and 1 sigma errors of 1.02(+0.36, -0.24) kpc. For the same set of 70 stars, the scale height and 1 sigma errors for H I are 0.67(+0.21, -0.16) kpc. The Al III scale height is similar to the value obtained for free electrons from pulsar dispersion measures. The ionized gas traced by Al III is somewhat more extended than the neutral gas traced by H I but less extended than the very highly ionized gas traced by Si IV, C IV, and N V.

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