Diffuse Helium Absorption as a Probe of Quasar History and Intergalactic Gas

Details Diffuse Helium Absorption as a Probe of Quasar History and Intergalactic Gas Diffuse Helium Absorption as a Probe of Quasar History and Intergalactic Gas

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5945h&link_type=abstract

HST Proposal ID #5945

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Hst Proposal Id #5945 Quasars

Scientific paper

We propose to reobserve the region of the possible helium Gunn -Peterson edge found by Jakobsen et al., using GHRS G140L (with FLYLIM commanding) to achieve significantly better wavelength calibration, resolution and signal to noise. Together with already extant ground-based data on the quasar and its hydrogen Lyman Alpha absorbers, these proposed GHRS data will be used to confirm that the edge is indeed produced by HeII 304 Angstrom absorption, to measure the Stromgren region of ionized helium near the quasar and compare with the corresponding void in the LyAlpha forest, to search for possible emission well beyond the edge corresponding to another void in the LyAlpha forest, and to set combined constraints on quasar luminosity history and IGM density. We will waive all proprietary rights to the data.

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