GHASP: an H$\alpha$ kinematic survey of spiral galaxies - X. Surface
  photometry, decompositions and the Tully-Fisher relation in the Rc-band
  We present Rc-band surface photometry for 170 of the 203 galaxies in GHASP,
Gassendi H-Alpha survey of SPirals, a sample of late-type galaxies for which
high-resolution Fabry-Perot H{\alpha} maps have previously been obtained. Our
data set is constructed by new Rc-band observations taken at the Observatoire
de Haute-Provence (OHP), supplemented with Sloan Digital Sky Survey (SDSS)
archival data, obtained with the purpose of deriving homogeneous photometric
profiles and parameters. Our results include Rc-band surface brightness
profiles for 170 galaxies and $ugriz$ profiles for 108 of these objects. We
catalogue several parameters of general interest for further reference, such as
total magnitude, effective radius and isophotal parameters -- magnitude,
position angle, ellipticity and inclination. We also perform a structural
decomposition of the surface brightness profiles using a multi-component method
in order to separate disks from bulges and bars, and to observe the main
scaling relations involving luminosities, sizes and maximum velocities.
  We determine the Rc-band Tully Fisher relation using maximum velocities
derived solely from H$\alpha$ rotation curves for a sample of 80 galaxies,
resulting in a slope of $-8.1 \pm 0.5$, zero point of $-3.0 \pm 1.0$ and an
estimated intrinsic scatter of $0.28 \pm 0.07$. We note that, different from
the TF-relation in the near-infrared derived for the same sample, no change in
the slope of the relation is seen at the low-mass end (for galaxies with
$V_{max} < 125$ km/s). We suggest that this different behaviour of the Tully
Fisher relation (with the optical relation being described by a single
power-law while the near-infrared by two) may be caused by differences in the
stellar mass to light ratio for galaxies with $V_{max} < 125$ km/s.
