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28 March 2024
 
  » arxiv » astro-ph/0311307

 Article overview


Detection of Intergalactic HeII Absorption at Redshift 3.5
W. Zheng ; K. Chiu ; S. F. Anderson ; D. P. Schneider ; C. J. Hogan ; D. G. York ; S. Burles ; J. V. Brinkmann ;
Date 13 Nov 2003
Subject astro-ph
Affiliation Johns Hopkins University, University of Washington, Pennsylvania State University, University of Chicago, Massachusetts Institute of Technology, Apache Point Observatory, New Mexico State University
AbstractThe 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.
Source arXiv, astro-ph/0311307
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