Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12276w&link_type=abstract
HST Proposal ID #12276. Cycle 18
Physics
Scientific paper
Most of the baryons {90%} are in the intergalactic medium {IGM}. Observationally, about 1/3rd of the IGM consists of photoionized hydrogen, which produces narrow Ly-alpha absorption lines. The remainder is predicted to be at temperatures >10^5 K, forming the WHIM; some of that gas produces broad Ly-alpha and OVI absorption. About half of the Ly-alpha lines originate within 400 kpc of galaxies {Wakker & Savage 2009}. The relationship of the more isolated absorbers to galaxies and galaxy filaments is still unclear. We have identified a 10 Mpc long galaxy filament, toward which 4 QSOs have already been observed, showing evidence for broad Ly-alpha and OVI lines in the galaxy environments. We propose to observe an additional 23 AGNs projected on and next to this filament to study {1} the extent of the Ly-alpha producing gas, {2} whether broad lines {some of which trace the WHIM} are only seen inside the filament or also outside, and {3} the relative velocities of the intergalactic gas and the galaxies in the filament.;
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