Properties of the Intergalactic Medium near the Epoch of HeII Reionization

Details Properties of the Intergalactic Medium near the Epoch of HeII Reionization Properties of the Intergalactic Medium near the Epoch of HeII Reionization

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9806z&link_type=abstract

HST Proposal ID #9806

Physics

Hst Proposal Id #9806 Quasar Absorption Lines And Igm

Scientific paper

Our STIS spectral snapshot programs have found a rare case of a HeII Lyman-alpha absorption trough in a z=3.51, V=17.6 quasar. This is the highest redshift at which this feature has been observed. We propose to obtain a high-quality STIS spectrum that will enable us to {1} Investigate the evolution and properties of the intergalactic medium {IGM} over an epoch between z=2.8 and 3.5; {2} Search for signs of the reionization of the intergalactic helium; {3} Measure the intensity of the UV background radiation, and find clues toward its origin; and {4} Estimate the IGM baryonic density. The instrument has been changed from STIS to ASC prism.

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