Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8316b&link_type=abstract
HST Proposal ID #8316
Computer Science
Hst Proposal Id #8316 Quasar Absorption Lines
Scientific paper
We propose to determine the size of Ly-alpha absorbing halos around nearby, relatively isolated galaxies, by searching for Ly-alpha absorption in STIS spectra of 12 UV-bright, background QSOs and AGNs. The galaxies selected cover a range of luminosities, from M_B = -16.1 to -19.9, and are probed at distances of 4-160 h from their centers. We aim to settle the question of whether galaxies possess extended, gaseous envelopes with radii of several hundred kpc, and whether the presence of Ly-alpha -absorbing gas around a galaxy depends on its luminosity, morphology, or inclination. We wish to obtain spectra with the G140M grating to measure precise column densities of the absorbing gas and thereby map the decline in H I column density with galactocentric radius. The high resolution of the spectra will allow us to accurately determine the velocity of the gas, which can be compared to the systemic velocity of the galaxy, and to the velocity field determined from 21 cm H I emi ss ion measurements, when available, enabling us to determine if or how the gas is kinematically tied to the galaxy.
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