Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-02-24
Mon.Not.Roy.Astron.Soc. 275 (1995) 169
Astronomy and Astrophysics
Astrophysics
MNRAS in press. 15 pages plain TeX plus 12 figures. PostScript version available from ftp://ftp.roe.ac.uk/pub/jap/klf or from
Scientific paper
We present a redshift survey of 124 galaxies, from an imaging $K$-band survey complete to $K\simeq 17.3$. The optical-to-infrared colours are consistent with the range expected from synthetic galaxy spectra, although there are some cases of very red nuclei. Our data show no evidence for evolution of the $K$-band luminosity function at $z<0.5$, and the results are well described by a Schechter function with $M_K^*=-22.75\pm0.13+5\log_{10}h$ and $\phi^*=0.026\pm0.003 h^3 {\rm Mpc^{-3}}$. This is a somewhat higher normalization than has been found by previous workers, and it removes much of the excess in faint $K$ and $B$ counts with respect to a no-evolution model. However, we do find evidence for evolution at $z>0.5$: $M_K^*$ is approximately 0.75 mag. brighter at $z=1$. This luminosity evolution is balanced by a reduced normalization at high redshift. The overall evolution is thus opposite to that expected in simple merger-dominated models.
Collins Charles Aloysius
Glazebrook Karl
Miller Lance L.
Peacock John A.
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