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We present the largest area survey to date (1.4 deg2) for Lyman-alphaemitters (LAEs) at z~9, as part of the Hi-z Emission Line Survey (HiZELS). Thesurvey, which primarily targets H-alpha emitters at z < 3, uses the Wide FieldCAMera on the United Kingdom Infrared Telescope and a custom narrow-band filterin the J band to reach a Lyman-alpha luminosity limit of ~10^43.8 erg/s over aco-moving volume of 1.12x10^6 Mpc^3 at z = 8.96+-0.06. Two candidates werefound out of 1517 line emitters, but those were rejected as LAEs afterfollow-up observations. This improves the limit on the space density of brightLyman-alpha emitters by 3 orders of magnitude and is consistent withsuppression of the bright end of the Lyman-alpha luminosity function beyondz~6. Combined with upper limits from smaller but deeper surveys, this rules outsome of the most extreme models for high-redshift Lyman-alpha emitters. Thepotential contamination of narrow-band Lyman-alpha surveys at z>7 by Galacticbrown dwarf stars is also examined, leading to the conclusion that suchcontamination may well be significant for searches at 7.7 < z < 8.0, 9.1 < z <9.5 and 11.7 < z < 12.2.

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