Limits on the luminosity function of Ly α emitters at z = 7.7

P. Hibon*, J. G. Cuby, J. Willis, B. Clément, C. Lidman, S. Arnouts, J. P. Kneib, C. J. Willott, C. Marmo, H. McCracken

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Aims. The Lyα luminosity function (LF) of high-redshift Lyα emitters (LAEs) is one of the few observables of the re-ionization epoch accessible with 8-10 m class telescopes. The evolution of the LAE LF with redshift is dependent upon the physical evolution of LAEs and the ionisation state of the Universe towards the end of the Dark Ages. Methods. We performed a narrow-band imaging program at 1.06 μm using CFHT/WIRCam. The observations target Lyα emitters at redshift z ∼ 7.7 in the CFHT-LS D1 field. From these observations we derived a photometric sample of 7 LAE candidates at z ∼ 7.7. Results. We derive luminosity functions for the full sample of seven objects and for subsamples of four objects. Assuming the brightest objects in our sample are real, we find that the resulting luminosity function is not consistent with previous work at lower redshifts. More definitive conclusions will require spectroscopic confirmation.

Original languageEnglish
Article numberA97
JournalAstronomy and Astrophysics
Volume515
Issue number11
DOIs
Publication statusPublished - 15 Jun 2010
Externally publishedYes

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