Physics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8582z&link_type=abstract
HST Proposal ID #8582
Physics
Hst Proposal Id #8582 Quasar Absorption Lines And Igm
Scientific paper
He II Ly alpha absorption at 304{1+z} Angstrom is a far more sensitive tracer of the intergalactic medium {IGM} than its H I counterpart. The recent detections of such absorption in four quasars, albeit with limited data quality and a small sample size, demonstrate the great potential of such a probe. The lines of sight toward the majority of z 3 quasars are intercepted by Lyman-limit systems, and these quasars' UV flux is cut off before reaching the He II Ly alpha feature. As a result of the SDSS, a number of bright {V<17.5}, z>2.5 quasars are being identified. We propose a STIS snapshot survey to confirm the UV detectability of about 20 such quasars, in order to select the candidates for follow-up spectroscopic observations with STIS, COS, or FUSE. Future high-quality HST spectra of these new quasars will enable us to map the 70% of the IGM whose properties remain largely unknown, and to set strict constraints on cold-dark-matter models of structure formation in the universe and reveal the evolution of the IGM from the epoch when the first generation of galaxies were formed down to z 3.
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