Parameters of galactic disks at optical and NIR wavelengths
  We have analyzed the radial scales, central surface brightnesses, and colors
of 404 disks of various types of galaxies. The central surface brightness mu0
and linear disk scale length h vary smoothly along the Hubble sequence of
galaxies within a rather narrow interval. The disks of relatively early type
galaxies display higher central surface brightnesses in K, higher central
surface densities, smaller sizes (relative to the diameter of the galaxy),
redder integrated and central colors. The color gradient normalized to the
radius of the galaxy and the blue central surface brightness mu0_{0,i}(B) of
the disk, are both independent of the galaxy type. The radial disk scales in
different photometric bands differ less in early-type than in late-type
galaxies. The ratio of linear disk scales measured in different photometric
bands increases with the isophote ellipticity e of the disk (the inclination of
the galaxy); however, the range of the ratio values for each e value exceeds
the range of variations of scale lengths ratio over e. The disks in S0 galaxies
have more homogeneous parameters than those in spiral galaxies. However, no
sharp boundary in the properties of disks in lenticular, spiral, and irregular
galaxies has been found; all parameters vary smoothly along the Hubble
sequence. A correlation between the central disk surface brightness and the
total luminosity of the galaxy is observed. We also consider the influence of
dust on the photometric parameters of the disks. We show that the dust
concentrated in dust lines towards the spiral arms and bars does not influence
to the scale lengths ratio.
