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28 March 2024
 
  » arxiv » astro-ph/0407409

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A Galaxy at z = 6.545 and Constraints on the Epoch of Reionization
Daniel Stern ; Sarah A. Yost ; Megan E. Eckart ; Fiona A. Harrison ; David J. Helfand ; S.G. Djorgovski ; Sangeeta Malhotra ; James E. Rhoads ;
Date 19 Jul 2004
Journal Astrophys.J. 619 (2005) 12-18
Subject astro-ph
Affiliation JPL/Caltech, Caltech, Columbia, STScI
AbstractWe report the discovery of a Lyman-alpha-emitting galaxy at redshift z=6.545 serendipitously identified in the course of spectroscopic follow-up of hard X-ray sources on behalf of the Serendipitous Extragalactic X-Ray Source Identification (SEXSI) survey. The line flux of the galaxy, 2.1e-17 erg/cm2/s, is similar to line fluxes probed by narrow-band imaging surveys; the 5.2 square-arcminutes surveyed implies a surface density of z~6.5 Lyman-alpha emitters somewhat higher than that inferred from narrow-band surveys. This source marks the sixth Lyman-alpha-emitting galaxy identified at z~6.5, a redshift putatively beyond the epoch of reionization when the damping wings of the neutral hydrogen of the intergalactic medium is capable of severely attenuating Lyman-alpha emission. By comparing the Lyman-alpha emitter luminosity functions at z~5.7 and z~6.5, we infer that the intergalactic medium may remain largely reionized from the local universe out to z~6.5.
Source arXiv, astro-ph/0407409
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