Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11642y&link_type=abstract
HST Proposal ID #11642. Cycle 17
Physics
Scientific paper
The Galactic corona is believed to play an essential role in the ``ecosystem'' of the Galaxy. But the extent and ionization state as well as the physical properties of the corona are yet to be determined. We request COS/HST observations to sample the intervening gas through the line absorptions of CIV, NV, SiIV, OI, SII, SiII, and FeII along the LMC X-3 sight line, toward which we have already detected OVI, OVII, and NeIX absorption lines and NVII, OVII, OVIII, and NeIX emission lines with FUSE, Chandra, and Suzaku observations. We have developed a software tool to jointly analyze the far-UV/X-ray absorption and emission spectra. The requested observations will not only allow us to rigorously test our preliminary results based on the existing observations, but also enable us to examine various models {e.g., diffuse hot gas vs. conductive layers} and to constrain the spatial and thermal properties of the hot gas over a broad temperature range. The results will p! rovide a unique calibration of our understanding of the corona.;
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