Probing the Outer Galaxy Halo

Details Probing the Outer Galaxy Halo Probing the Outer Galaxy Halo

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5889s&link_type=abstract

HST Proposal ID #5889

Physics

Hst Proposal Id #5889 Interstellar Medium

Scientific paper

We propose to obtain GHRS 15 km/s resolution G160M integrations of highly ionized gas absorption (N V and CIV) toward PKS2155-304 and NGC5548 in order to continue our HST program to study highly ionized gas in the unexplored outer Galactic halo. The spectral integrations are planned to also provide important low ionization measurements of absorption by Mg II, S II, and Si II. The data will be used to study such questions as: What are the physical properties of gas in the outer Galaxy halo? Does the Galaxy have a highly ionized outer boundary? What are the ionization processes occurring in the outer Galaxy halo? Does the Galaxy have a high velocity cloud phenomenon detectable in high ionization lines? What are the relationships between the high ionization and low ionization absorption? What is the relationship between absorption occurring in the outer Galaxy halo and that seen in quasar absorption line systems at low and high redshift?

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