Other
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10254r&link_type=abstract
HST Proposal ID #10254
Other
Hst Proposal Id #10254 Galaxies
Scientific paper
We propose to observe the gaseous halo of a nearby edge-on spiral galaxy using STIS G140M {centered at 1222A and 1567A} and G230M {centered at 2828A} spectra of 3 bright QSOs that surround it at different impact parameters and position angles. These observations will allow us to determine the extent, metallicity, and ionization state of the gaseous halo of a normal L* spiral galaxy for the first time. These observations will determine whether galaxy halos: {1} have extents consistent with the statistical measurements from QSO absorption line number densities {50 kpc for Mg II, 100 kpc for C IV, and 250 kpc for Ly-alpha}, {2} are round or highly flattened, and {3} have significant metallicities {> 10% solar} extending up to 50 or even 100 kpc. These data will also allow us to determine some simple kinematics for this halo gas. The edge-on Sc galaxy ESO 157-G049 and the triple system of bright QSOs that all probe its halo within a projected distance of 125 kpc is unique - we have searched the entire sky for bright QSOs within 150 kpc of nearby galaxies and no other nearby galaxies are probed by three QSOs bright enough to be observed with HST/STIS. Our Cycle 11 snapshot program has measured accurate far-UV fluxes for these QSOs and has already made probable detections of Ly-alpha absorption associated with this galaxy in 2 of the QSO sight lines.
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