Computer Science
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10256t&link_type=abstract
HST Proposal ID #10256
Computer Science
Hst Proposal Id #10256 Quasar Absorption Lines/Igm
Scientific paper
We propose to double the existing information on the ionization of HeII in the IGM at redshifts around 3. We will observe 3 QSOs that are bright in the far UV. Each will give a moderate resolution HST spectrum better than any obtained so far. We will also observe a fourth QSO that currently lacks high SNR spectra. This program addresses a central issue in cosmology: the reionization of the intergalactic medium {IGM}. Current theoretical models predict that H I starts to reionize around z=17, completing near 6, while HeII reionization is delayed until z=3. The theoretical models of the ionization of HeII in the IGM now offer more detailed predictions that the data can distinguish. The new spectra will provide the data required to distinguish between different reionization scenarios, by increasing the number of lines of sight near z=3 with good spectra from 3 to 7, 3 of which will have the best sensitivity to the HeII optical depth. For the first time we also explore the 3-dimensional distribution of the ionizing regions, to characterize the luminosity and number density of the ionizing sources.
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