Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7737r&link_type=abstract
HST Proposal ID #7737
Physics
Hst Proposal Id #7737 Quasar Absorption Lines
Scientific paper
We wish to study the physical nature of low redshift Lyman Alpha absorption systems and their relation to galaxies. The recent ROSAT discovery of the optically-bright x-ray selected QSO RX J1230.8+0115 {z_em = 0.117, m_v = 14.7} has fortuitiously provided us with a bright quasar only 0.9 degrees away from 3C273 {the brightest QSO in the sky}. We propose to obtain high dispersion spectroscopy of RX J1230.8+0115 with the STIS E140M grating in order to investigate the presence and the kinematics of common absorption features in both QSO spectra, on scales between 211 h_75^-1 kpc and 4.9 h_75^-1 Mpc, probing down to column densities of 10^12 cm^-2. Recent Cy4 results suggest Ly Alpha length scales of 1 h_75^-1 Mpc for the higher column density systems. Measurements of velocity and column density in both lines-of-sight, along with redshifts of nearby galaxies will help to discriminate between models of galactic absorption and to map the distribution of Hydrogen gas in the local universe. This project is unique in two aspects: we are observing two of the brightest QSOs on the sky, along lines-of-sight running through the outskirts of the Virgo cluster, and, the line-of- sight to and the galaxy field around 3C273 has been studied in great detail during the past few years. Information available on the low redshift absorbers towards 3C273 includes unique echelle UV spectroscopy, a deep 21 cm map, a redshift survey of nearby galaxies, and a 54'*54' deep mosaic of the field. Combining this information with a new line-of-sight which can also be probed to very low column density, we will be able to shed light on the question of whether the low redshift Lyman Alpha forest is related to galaxies or represents a truly intergalactic phenomenon.
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