Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9434l&link_type=abstract
HST Proposal ID #9434
Other
Hst Proposal Id #9434
Scientific paper
We propose to obtain SNAPSHOT STIS echelle observations of key tracers of hot interstellar gas {CIV, NV and SiIV} for selected FUSE Team OVI 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 CIV, NV, OVI and SiIV, 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}. The proposed SNAPSHOT observations will extend our previous Cycle 9 survey {which was compromised by the STIS side 1 failure}, and should roughly double the number of stars for which high quality STIS observations of the important hot gas tracers are available, enabling us to derive a truly global view of the hot ISM.
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