A Search for transparent lines of sight with Intergalactic HeII absorption towards 26 bright z > 2.9 Quasars

Details A Search for transparent lines of sight with Intergalactic HeII absorption towards 26 bright z > 2.9 Quasars A Search for transparent lines of sight with Intergalactic HeII absorption towards 26 bright z > 2.9 Quasars

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8287r&link_type=abstract

HST Proposal ID #8287

Physics

Hst Proposal Id #8287 Quasar Absorption Lines

Scientific paper

We propose to probe the far-UV continuum fluxes of 26 new bright {B < 17, 5} 2.9 <= z <= 3.2 QSOs from the Hamburg Bright Quasar Survey by means of single-orbit STIS exposure, with the aim of identifying more suitable bright objects for detailed studies of intergalactic HeII absorption over this redshift range. According to improved estimates of the Ly C opacity of the IGM, we expect at least 3 positive detections. Together with 15 FUSE Cycle 1 targets with z < 2.9, successful detections will provide detailed information on the HeII reionization history of the universe which appears to occur close to z = 2.9 and on the diffuse intergalactic medium.

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