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Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8662l&link_type=abstract
HST Proposal ID #8662
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Hst Proposal Id #8662 Ism And Circumstellar Matter
Scientific paper
We propose to obtain SNAPSHOT STIS echelle observations of key tracers of hot interstellar gas {C IV, N IV, and Si IV} for selected FUSE Team O VI survey targets with known UV fluxes. By taking advantage of the SNAPSHOT observing mode we will efficiently obtain a large number of spectra suitable for the study of the highly ionized hot component of the interstellar medium {ISM}. Our goals are to explore the physical conditions in and distribution of such gas, as well as to explore the nature of the interfaces between the hot ISM and the other interstellar gas phases. Using inter-comparisons of the various ionic ratios for C IV, N IV, O VI and Si IV, we will be able to discriminate between the various models for the production of the highly ionized gas in the Galactic ISM. The survey will also enable detailed studies of regions already known to contain hot gas through X-ray emission measurements {e.g., SNRs and radio loops}. Currently there are only 14 stars in the FUSE Team ionO6 survey that have planned or archived HST exposures that cover the lines of C IV, N IV, and Si IV. We estimate that the proposed SNAPSHOT observations should more than triple the size of the sample for which all of the important hot gas tracers are available, enabling us to derive a truly global view of the hot ISM.
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