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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448293.0, MPI für Astronomie / Publikationen_mpia
Bright Lyα emitters at z ~ 9: constraints on the LF from HizELS
Authors:Sobral, D.; Best, P. N.; Geach, J. E.; Smail, Ian; Kurk, J.; Cirasuolo, M.; Casali, M.; Ivison, R. J.; Coppin, K.; Dalton, G. B.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Issue / Number:1
Start Page:L68
End Page:L72
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:New results are presented, as part of the Hi-z Emission Line Survey (HizELS), from the largest area survey to date (1.4 deg2) for Lyalpha emitters (LAEs) at z ~ 9. The survey, which is primarily targeting Halpha emitters at z < 3, uses the Wide Field CAMera on the United Kingdom Infrared Telescope and a custom narrow-band filter in the J band and reaches a Lyalpha luminosity limit of ~1043.8ergs-1 over a co-moving volume of 1.12 × 106Mpc3 at z = 8.96 +/- 0.06. Only two candidates were found out of 1517 line emitters and those were rejected as LAEs after follow-up observations. The limit on the space density of bright LAEs is improved by three orders of magnitude, consistent with suppression of the bright end of the Lyalpha 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 LAEs. The potential contamination of future narrow-band Lyalpha 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. Based on observations obtained with the Wide Field CAMera (WFCAM) and the Cooled Grating Spectrometer (CGS4) on the United Kingdom Infrared Telescope (UKIRT) as part of the Hi-z Emission Line Survey (HizELS). E-mail: drss@roe.ac.uk
Free Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: luminosity function; mass function; cosmology: observations
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009MNRAS.398L..68S [ID No:1]
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