Authors: Alister Graham
Abstract: The K-band light-profiles from a sample of roughly 100 disk galaxies have been simultaneously modelled with a seeing convolved Sersic r^{1/n} bulge and an exponential disk. Rather than a constant central disk surface brightness, in the near-infrared, mu_{0,K} is shown to decrease with the logarithm of the disk scale-length (log h) -- with a correlation coefficient equal to 0.78, a slope of -2, and a standard deviation of 0.5 mag. Galaxy types Scd or later are observed to have fainter disks.