The Local Ly(alpha) Forest: Determining the Relationship Between Ly(alpha) Clouds, Galaxies & Large-scale Structure

Details The Local Ly(alpha) Forest: Determining the Relationship Between Ly(alpha) Clouds, Galaxies & Large-scale Structure The Local Ly(alpha) Forest: Determining the Relationship Between Ly(alpha) Clouds, Galaxies & Large-scale Structure

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..155s&link_type=abstract

NOAO Proposal ID #2000A-0155

Computer Science

Scientific paper

We propose to use the WIYN+HYDRA to complete a galaxy redshift survey to B≤19 in the vicinity of very local (cz ≲ 7,500 km s^-1): Ly(alpha) clouds found in the spectra of very bright AGN observed with the HST/GHRS and HST/STIS. These very low column density (log N(H I)< 14.5) clouds are the low z analogue of the high z ``Ly(alpha) Forest'' clouds, which are thought to be intergalactic in nature, i.e., not associated with galaxies. Our discovery of these clouds in nearby voids strongly suggests that at least some of them are truly intergalactic. The primary purpose of the current proposal is to test this hypothesis by searching for faint dwarf galaxies close to the HST discovered Ly(alpha) clouds. A secondary purpose is to explore the extent and baryon content of the Ly(alpha) absorbing halos of all galaxies observed. Because these clouds are very nearby ( > 3 times closer than typical ``Key Project'' clouds), extremely faint limits ( M_B=-16 for the most distant of these clouds) can be set using WIYN+HYDRA observations. This proposal targets as its highest priorities a unique sightline pair with 0°.9 separation (~200 kpc:1500 km s^-1) and a nearby ``void'' absorber.

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