Hot Gas in the Interstellar Medium

Details Hot Gas in the Interstellar Medium Hot Gas in the Interstellar Medium

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2403c&link_type=abstract

HST Proposal ID #2403

Physics

Hst Proposal Id #2403

Scientific paper

The enormous gain in sensitivity and resolution of the HRS over previous instruments will at last allow us to make a detailed study of the distribution of thermally ionized N V and C IV absorption in the galactic disk. A survey of these ions in 8 carefully chosen stars ranging in distance from 80 pc to 3 kpc will provide a crucial test of the distribution of the hot gas in the interstellar medium and in particular of evaporation-front models of O VI production. The ratios of C IV and N V to O VI and Si IV will allow us to test the predicted ionization ratios, while the evolution of equivalent with and velocity spread wtih distance will allow us to measure the number of components. Comparisons with lower ionization stages will test if the hot gas producing this absorption is physically associated with cooler material.

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