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28 March 2024 |
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Article overview
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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 | Abstract: | 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. | Source: | arXiv, astro-ph/0311307 | Services: | Forum | Review | PDF | Favorites |
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