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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 Mpc 3  to a Lyα emission luminosity of  10 43  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  &lt; 7  and simulated populations at   z  &gt; 7 .

ZEN2: a narrow J ‐band search for z ∼ 9 Lyα emitting galaxies directed towards three lensing clusters