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A deep   K   s   ‐band photometric catalogue of galaxies at the core of the rich, nearby Norma cluster (ACO3627) is presented. The survey covers about  45 × 45 arcmin 2   (slightly less than 1/3 Abell radius), which corresponds to  ∼0.8  h  −2  70  Mpc 2   at the adopted distance  ( v  CMB / H  0 )  of  70  h  −1  70  Mpc  of this cluster. The survey is estimated to be complete to a magnitude of . This extends into the dwarf regime, 6 mag below . The catalogue contains 390 objects, 235 of which are classified as likely or definite galaxies and 155 as candidate galaxies. The   K   s   ‐band luminosity function (LF) is constructed from the photometric sample, using a spectroscopic subsample to correct for fore and background contamination. We fit a Schechter function with a characteristic magnitude of  and faint‐end slope of  α=−1.26 ± 0.10  to the data. The shape of the LF is similar to those found in previous determinations of the cluster LF, in both optical and near‐infrared. The Schechter parameters agree well with those of recent field LFs, suggesting that the shape of both the bright‐end and the faint‐end slopes are relatively insensitive to environment.

The Norma cluster (ACO3627) – II. The near‐infrared K s ‐band luminosity function