Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9193c&link_type=abstract
HST Proposal ID #9193
Physics
Hst Proposal Id #9193 Ism And Circumstellar Matter
Scientific paper
We aim to study the distribution many ionization stages of gas by looking out from the Milky Way galaxy along 33 lines of sight toward various AGNs and QSOs. The HST archive is rapidly accumulating high resolution UV spectra of these objects with STIS/E140M and E230M. The majority have been observed to study absorption by intervening galaxies by the AGN/QSO itself. However, the kinematically complex, redshift zero absorption features in these spectra can be used to survey the gas in the disk, halo, and extended group environment of the Milky Way. With the archival spectra we will conduct a survey for high velocity clouds in the vicinity of the Milky Way and Local Group, much more sensitive than traditional 21-cm probes. We will also consider the physical conditions of gas related to the extended corona surrounding the Milky Way disk, focusing on the kinematic distributions of high ionization transitions. The local environment, where we can study directly the structures, star formation rate, and distribution of HI, is a calibrator for studies of complex metal--line absorption systems at higher redshifts. Of particular interest is the evolution of galaxy coronae and the origin of ``satellite'' high velocity absorption features seen in many strong Mg II absorption line systems, i.e. their relationship to Galactic high velocity clouds.
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