Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7762o&link_type=abstract
HST Proposal ID #7762
Computer Science
Hst Proposal Id #7762 Stellar Populations
Scientific paper
We propose to probe the interstellar gas content of the Ursa Minor dwarf spheroidal galaxy. We have discovered a V=18.66 QSO at approximately 1 core radius from the center of UMi. We will use the FOS to look for EUV absorption lines from gas in UMi. This technique complements previous unsuccessful searches for gas in dSph. These galaxies should have large reservoirs of gas: some of them { e.g. Carina and Leo I}, made a significant second generation of stars a few Gyr ago, and since their gravitational potential is dominated by dark matter, they should be able to retain an observable amount of gas, built up through infall or stellar mass loss. We intend to use the G270H grating, which allows us to observe the Mg II doublet, Mg I, Fe II lines, and weak Fe I, Al I, Mn II, and Ti II lines. Because of the patchy nature of the Milky Way high velocity halo gas, we will also observe a brighter, nearby QSO {2^degrees away} to ensure that we can ascribe any detections to UMi. Finally we will take a low resolution, G160L, spectrum to see if the UMi QSO is clear of optically thick Lyman limits for future spectroscopy of more highly ionized species.
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