Caught in the act : a helium-reionizing quasar near the line of sight to Q 0302 − 003 ?

Abstract

We report the discovery of a quasar at z = 3.050 ± 0.003, closely coincident in redshift with the isolated low-opacity feature seen near z 3.056 in the otherwise black portion of the He  Gunn-Peterson absorption trough seen toward the z = 3.286 background quasar Q0302−003, located 6. 5 away on the sky. We explore plausible models for the He  ionization… (More)

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