Detection of Intergalactic HeII Absorption at Redshift 3.5

Details Detection of Intergalactic HeII Absorption at Redshift 3.5 Detection of Intergalactic HeII Absorption at Redshift 3.5

2003-11-13

arxiv.org/abs/astro-ph/0311307v1

Astronomy and Astrophysics

Astrophysics

11 pages, 3 Postscript figures, uses Aastex.sty The Astronomical Journal, in press

Scientific paper

10.1086/381485

The large number of quasars found in the Sloan Digital Sky Survey has allowed searches for elusive, clear lines of sight towards HeII Ly-alpha absorption, a sensitive probe of the intergalactic medium. The few known systems indicate that HeII reionization occurs at z>3. We report the detection of a HeII Ly-alpha absorption edge in a quasar spectrum at z=3.50, the most distant such feature found to date. The candidate quasar was selected from a z~3 sample in the SDSS spectroscopic quasar survey and confirmed as part of an HST/STIS SNAP survey. We discuss the general characteristics of the absorption feature, as well as the probability for discovery of additional such objects.

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