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The HiZELS/UKIRT large area survey for bright Lyman-alpha emitters at z~9

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  • David Sobral
  • Philip Best
  • Jim Geach
  • Ian Smail
  • Jaron Kurk
  • Michele Cirasuolo
  • Mark Casali
  • Rob Ivison
  • Kristen Coppin
  • Gavin Dalton
Publication date9/10/2013
Host publicationThirty Years of Astronomical Discovery with UKIRT
EditorsAndy Adamson, John Davies, Ian Robson
Number of pages8
ISBN (electronic)9789400774322
ISBN (print)9789400774315
<mark>Original language</mark>English

Publication series

NameAstrophysics and Space Science Proceedings
ISSN (Print)1570-6591


We present the largest area survey to date (1.4 deg2) for Lyα emitters (LAEs) at z ∼ 9, as part of the Hi-z Emission Line Survey (HiZELS). The survey, which primarily targets Hα emitters at z > 3, uses the Wide Field Camera on the United Kingdom Infrared Telescope and a custom narrowband filter in the J band to reach a Lyα luminosity limit of ∼1043.8 erg s−1 over a co-moving volume of 1.12 × 106 Mpc3 at z = 8.96 ± 0.06. Two candidates were found out of 1,517 line emitters, but those were rejected as LAEs after follow-up observations. This improves the limit on the space density of bright Lyα emitters by three orders of magnitude and is consistent with suppression of the bright end of the Lyα luminosity function beyond z ∼ 6. Combined with upper limits from smaller but deeper surveys, this rules out some of the most extreme models for high-redshift Lyα emitters. The potential contamination of narrowband Lyα surveys at z < 7 by Galactic brown dwarf stars is also examined, leading to the conclusion that such contamination may well be significant for searches at 7.7 > z > 8.0, 9.1 > z > 9.5 and 11.7 > z > 12.2.

Bibliographic note

To appear in proceedings of "UKIRT at 30: A British Success Story"