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 ZEN and the search for high-redshift galaxies

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We present the ZEN z equals nine survey: a deep, narrow J-band search for proto-galactic Lya emission at redshifts z=9. In the first phase of the survey, dubbed ZEN1, we combine an exceptionally deep image of the Hubble Deep Field South, obtained using a narrow band filter centred on the wavelength 1.187 microns, with existing deep, broad band images covering optical to near infrared wavelengths. Candidate z=9 Lya-emitting galaxies display a significant narrow band excess relative to the Js-band that are undetected at optical wavelengths. We detect no sources consistent with this criterion to the 90% point source flux limit of the NB image, F NB = 3.28e-18 ergs-s-cm2. The survey selection function indicates that we have sampled a volume of approximately 340 h^{-3} Mpc3 to a Lya emission luminosity of 10e43 h^{-2} ergs-s. When compared to the predicted properties of z=9 galaxies based upon no evolution of observed z=6 Lya-emitting galaxies, the `volume shortfall of the current survey, i.e. the volume required to detect this putative population, is a factor of at least 8 to 10. We also discuss continuing narrow J-band imaging surveys that will reduce the volume shortfall factor to the point where the no-evolution prediction from z=6 is probed in a meaningful manner.

Author: J. P. Willis; F. Courbin; J-P. Kneib; D. Minniti

Source: https://archive.org/

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