Computer Science
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4619s&link_type=abstract
HST Proposal ID #4619
Computer Science
Hst Proposal Id #4619
Scientific paper
We propose to obtain GHRS G160M observations (FWHM=15 km/s) of the C IV 1548,1550 doublet and the N V 1238,1242 doublet absorption produced by the Milky Way disk and halo gas toward the bright quasar H1821+643. Existing GHRS observations of the N V doublet toward H1821+643 reveal the presence of a large amount of N V gas at large negative velocity (-140 km/s). This gas is probably associated with the outer warp of the Galaxy. The gas is estimated to have a Galactocentric distance of ~25 kpc, and to be ~11 kpc above the disk. The existence of a large amount of highly ionized gas in the outer halo of the Galaxy is difficult to understand. The proposed observations will allow us to supplement the existing N V data to accurately measure the N V column density, and to examine the detailed velocity structure. The N V absorption will be compared with the C IV absorption in order to understand the ionization mechanism of the outer halo gas. The comparison will also allow us to examine how the ionization level of the gas depends Galactocentric distance by using Galactic rotation as a tool to locate the gas. The study will be aided by low ion line
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