Other
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..983s&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 691, p. 983-986.
Other
2
Early Stars, Interstellar Gas, Ionized Gases, Iue, Milky Way Galaxy, Line Of Sight, Magellanic Clouds, Oxygen Ions
Scientific paper
Combined high-dispersion IUE spectra of interstellar Si IV, C IV, and N V absorption along distant sight lines toward early-type stars in the Galactic disk and low halo are discussed. The highly ionized species have complex profiles and exhibit stronger absorption toward distant low-latitude stars than toward high-latitude stars. Absorption along low-latitude directions is often broadened substantially by Galactic rotation. Along these sight lines the Si IV, C IV, and N V profiles are more similar in shape to each other than to those of Al III, which is a tracer of photoionized interstellar gas. The observed column density ratios of the high ions are similar in widely different regions within the Galaxy. The similarities in the high ion profile shapes along individual sight lines and integrated column density ratios along different sight lines suggest a common origin for these species in collisionally ionized gas associated with a global process such as a Galactic fountain.
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