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| - A narrow-band search for Ly $\mathsf{\alpha}$ emitting galaxies at z = 8.8
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| - Aims.The first star forming galaxies in the early universe should be copious Ly α emitters and may play a significant role in ionizing the intergalactic medium (IGM). It has been proposed that the luminosity function of Ly α emitting galaxies beyond z ~ 6 may be used to constrain the neutral fraction of the IGM during this epoch. In this work we report on a search for Ly α emitters at redshift 8.8. Methods.We performed a narrow band imaging programme using ISAAC at the ESO VLT. Seven fields, covering a total area of 31 sq. arcmin and for which optical and broad band infra-red images have been obtained in the GOODS survey, were imaged to a limiting flux (respectively luminosity) of ~1.3 $\times$ 10 -17 erg s -1 cm -2 (respectively ~1.3 $\times$ 10 43 erg s -1) in a narrow band filter centered in a region of low OH sky emission at 1.19 μm. Candidate Ly α emitters are objects that are detected in the ISAAC NB images and undetected in the visible broad band images. Results.No $z=8.8$ Ly α emitting galaxies were detected to a limit approaching recent estimates of the luminosity function at $z\sim 6$. Our results do suggest, however, that detections or substantial constraints could be achieved by this method in the near future with larger field instruments planned for various telescopes.
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