Other
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12204t&link_type=abstract
HST Proposal ID #12204. Cycle 18
Other
Scientific paper
We propose a 14 orbit pilot study to investigate the ionized gas in the interface region between the cool neutral gas of the Magellanic Stream and the ambient hot gas of the Milky Way halo. We have chosen 3 bright QSOs clustered around a small { 1 sq. deg.} cloud associated with the Magellanic Stream. One of these QSOs {Ton S210} probes the neutral 21cm gas, while the other two lie just outside 21cm contours. Observations of Ton S210 will be used in conjunction with neutral and low-ionization absorption lines to set the metallicity of the gas. The outer two targets will be used to detect higher ionization states such as CIV, SiIV and NV, that typically trace warm ionized gas. The observed metallicity, gas temperature and line ratios will be used as inputs to modeling in order to determine the ionization state and physical conditions of the gas in the cool-hot interface region. Contingent on the success of this pilot program, we anticipate future observations to fully characterise the ionization state along the full length of the Magellanic Stream. These observations would be a significant advance in our understanding of the nature of Milky Way halo, the evolution of clouds in the halo, and the formation and ultimate fate of the Magellanic Stream. They will also have important implications for the inpretation of z > 0 QSO absorption-line studies.;
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