  We have then searched for preferential orientations of faint galaxies in the
Coma cluster (down I_Vega~-11.5). By applying a deconvolution method to deep u*
and I band images of the Coma cluster, we were able to recover orientations
down to faint magnitudes. No preferential orientations are found in more than
95% of the cluster, and the brighter the galaxies, the fewer preferential
orientations. The minor axes of late type galaxies are radially oriented along
a northeast -southwest direction and are oriented north-south in the western
X-ray sub- structures. For early type galaxies, in the western regions showing
significant preferential orientations, galaxy major axes are oriented
perpendicularly to the north-south direction. In the eastern significant region
and close to NGC 4889, galaxy major axes also point toward the 2 cluster
dominant galaxies. In the southern significant regions, galaxy planes are
tangential with respect to the clustercentric direction, except close to
(alpha=194.8, delta=27.65) where the orientation is close to -15deg. Part of
the orientations of the minor axes of late type galaxies and of the major axes
of early type galaxies can be explained by a tidal torque model applied to
cosmological filaments and local merging directions. Another part (close to
NGC4889) can be accounted for by collimated infalls. For early type galaxies,
the (alpha=194.8, delta=27.65) region shows orientations that probably result
from processes involving induced star formation.
