Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9067z&link_type=abstract
HST Proposal ID #9067
Physics
Hst Proposal Id #9067 Quasar Absorption Lines And Igm
Scientific paper
He II LyAlpha absorption at 304{1+z} Angstrom is a far more sensitive tracer of the IGM than its H I counterpart. The recent detection of such absorption in a small handful of quasars, albeit with limited data quality and tiny sample size, demonstrates the great potential of such a probe. Unfortunately, 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 redward of the He II LyAlpha feature. In order to sample more than just a few clean lines of sight to high redshift, and with good quality spectra, it is necessary to find additional high-redshift, UV-bright quasars. The Sloan Digital Sky Survey, which has discovered more than 2600 quasars and will identify 20 000 quasars per year, with provides a very substantial resource for new, bright, high-redshift quasars. In a continuation of our SNAPSHOT survey GO-8582, we propose to take MAMA spectra of approximately 30 such quasars in each of the next three cycles. The goal is to find additional rare z > 2.9 quasars having sufficient UV flux to allow detailed He II LyAlpha absorption follow-on spectroscopic studies {at good S/N and resolution} with STIS and COS in future HST cycles.
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