Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11667c&link_type=abstract
HST Proposal ID #11667. Cycle 17
Physics
Scientific paper
At intermediate redshifts, Ly-alpha absorbers cluster around rich metal-line systems [those with numerous low and high ionization species {Bahcall et al.}], and at z=3, higher ionization clouds reside at the velocity extremes of clustered Ly-alpha lines, a signature of the physics of collapse and layered gas structures {Songaila & Cowie}. These extraordinary HI environments provide unique astrophysical laboratories for probing relatively high overdensity IGM structures and for placing powerful constraints on our understanding of the intergalactic medium and extended galaxy halos in the context of structure evolution, galactic stellar feedback chemical enrichment to large galactocentric distances, and the cosmic baryon budget. We have undertaken a comprehensive study of the remarkable 1400 km/s velocity width, optically thin Ly-alpha only complex {five components} at z=0.67 within 1600 km/s of the Lyman limit z=0.66 metal-line system toward TON 153 {Churchill et al.}. We have collected FOS, STIS, and HIRES quasar spectra covering the Lyman series, OVI, CIV, and MgII absorption, an F702W/WFPC-2 image, and set of ground based narrow-band SDSS filter images of the quasar field. Two galaxies aligned in velocity with the z=0.67 Ly-alpha complex and z=0.66 metal-line system lie within 100 kpc of the quasar sightline; the absorption is not consistent with our standard model of extended "halo" gas for either galaxy, which suggests that a large scale structure {i.e., filament} may extend between these galaxies. We propose to obtain G160M/1600 and G185M/1921+1941 {S/N>10} COS spectra of the z=1.01 quasar TON 153 to obtain detailed kinematic, chemical, and ionization conditions of this extraordinary absorber/galaxy system {total velocity spread 3000 km/s}. The propose observations will provide an unprecedented first high resolution examination of the full Lyman series and MgII, CIV, and OVI metal lines arising in galaxy halos or a possible large scale structure {i.e., filament} asscociated with thoroughly studied galaxies. We aim to discern if the HI extends between the galaxies and test for multiphase absorption signatures suggestive of a galactic feedback or large scale collapsing structure.;
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