a Snapshot Survey of High Column Density, Low-Z LyAlpha Absorbers

Details a Snapshot Survey of High Column Density, Low-Z LyAlpha Absorbers a Snapshot Survey of High Column Density, Low-Z LyAlpha Absorbers

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9506s&link_type=abstract

HST Proposal ID #9506

Physics

Hst Proposal Id #9506

Scientific paper

We propose a STIS G140L spectroscopic Snapshot program of bright {V<=16.5} AGN not previously observed in the UV to discover new high-column density {N_H >= 10^15 cm^-2} LyAlpha absorbers in the local Universe {z <= 0.45}. Many more of these high column density systems are needed because: {1} They contribute most of the baryons to the local IGM; {2} They include systems for which valuable metallicity and D/H measurements can be made with the Cosmic Origins Spectrograph {COS}; {3} They include many of the ``warm-hot'' absorbers, thought to be a large baryon reservoir in the local Universe; and {4} They are most likely to be ``associated'' with galaxy halos. Because of their low-z, many of these absorbers can be located relative to galaxies of known redshifts, allowing an immediate scientific return from these snapshots. Perhaps the most important, lasting results of this survey require higher resolution reobservations with COS by our GTO team. Using these snapshots to select the best targets, we will obtain COS R 22, 000 spectra to determine the D/H and metallicity of absorbers in galaxy halos, groups, and voids. We will use pairs and ``constellations'' of AGN to determine absorber sizes, shapes, and covering factors. Candidate ``warm-hot'' absorbers will be reobserved with COS to determine their numbers accurately and to assess their metallicity, sizes, and relationships to galaxies and galaxy groups.

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