Luminosity Profiles of Prominent Stellar Halos
  We present a sample of 54 disk galaxies which have well developed extraplanar
structures. We selected them using visual inspections from the color images of
the Sloan Digital Sky Survey. Since the sizes of the extraplanar structures are
comparable to the disks, they are considered as prominent stellar halos rather
than large bulges. A single S\'ersic profile fitted to the surface brightness
along the minor-axis of the disk shows a luminosity excess in the central
regions for the majority of sample galaxies. This central excess is considered
to be caused by the central bulge component. The mean S\'ersic index of the
single component model is $1.1\pm0.9$. A double S\'ersic profile model that
employs $n=1$ for the inner region, and varying $n$ for the outer region,
provides a better fit than the single S\'ersic profile model. For a small
fraction of galaxies, a S\'ersic profile fitted with $n=4$ for the inner region
gives similar results. There is a weak tendency of increasing $n$ with
increasing luminosity and central velocity dispersion, but there is no
dependence on the local background density.
