A SNAPshot Survey of Absorption Lines from High Velocity Clouds in the Milky Way

Details A SNAPshot Survey of Absorption Lines from High Velocity Clouds in the Milky Way A SNAPshot Survey of Absorption Lines from High Velocity Clouds in the Milky Way

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9128b&link_type=abstract

HST Proposal ID #9128

Physics

Hst Proposal Id #9128 Ism And Circumstellar Matter

Scientific paper

Through STIS moderate resolution spectroscopy, we propose to search for Mg II and Mg I absorption from Galactic High Velocity Clouds {HVCs} along the sightlines of 51 of the brightest QSOs, BL Lacs and Seyfert 2 galaxies in the sky. The origins of the HVCs are still not known with certainty, despite the fact that they are probably the direct manifestations of the physical processes which drive and regulate the Milky Way's interstellar medium. Detection of Mg II at our anticipated sensitivity level would correspond to a neutral hydrogen column density of 2* 10^17 pcm , a factor of five below that which has been detected in 21 cm surveys. We aim to: establish the covering factor of gas at this level across the sky; search for absorption with no corresponding 21 cm emission; examine the velocity structure of the absorbing clouds with the G230MB's resolution of 20 kms ; and establish a database of HVCs toward the brightest UV background sources to enable future researchers to study the clouds in more detail. Past studies with HST have probed only 10 lines-of- sight through the Galactic halo at resolutions of < 200 kms , and our SNAPshot survey should more than triple the sample of HVCs identified from their absorption lines.

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