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J. P. Willis F. Courbin J.-P. Kneib D. Minniti 《Monthly notices of the Royal Astronomical Society》2008,384(3):1039-1044
We present the results of a continuing survey to detect Lyα emitting galaxies at redshifts z ∼ 9 : the ' z equals nine' (ZEN) survey. We have obtained deep VLT Infrared Spectrometer and Array Camera observations in the narrow J -band filter NB119 directed towards three massive lensing clusters: Abell clusters 1689, 1835 and 114. The foreground clusters provide a magnified view of the distant Universe and permit a sensitive test for the presence of very high redshift galaxies. We search for z ∼ 9 Lyα emitting galaxies displaying a significant narrow-band excess relative to accompanying J -band observations that remain undetected in Hubble Space Telescope ( HST )/Advanced Camera for Surveys (ACS) optical images of each field. No sources consistent with this criterion are detected above the unlensed 90 per cent point-source flux limit of the narrow-band image, F NB = 3.7 × 10−18 erg s−1 cm−2 . To date, the total coverage of the ZEN survey has sampled a volume at z ∼ 9 of approximately 1700 comoving Mpc3 to a Lyα emission luminosity of 1043 erg s−1 . We conclude by considering the prospects for detecting z ∼ 9 Lyα emitting galaxies in light of both observed galaxy properties at z < 7 and simulated populations at z > 7 . 相似文献
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