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Context. The elliptical galaxy NGC 3923 is known to be surrounded by a numberof stellar shells, probable remnants of an accreted galaxy. Despite itsuniqueness, the deepest images of its outskirts come from the 1980s. On thebasis of the modified Newtonian dynamics (MOND), it has recently been predictedthat a new shell lies in this region.  Aims. We obtain the deepest image ever of the galaxy, map the tidal featuresin it, and search for the predicted shell.  Methods. The image of the galaxy was taken by the MegaCam camera at theCanada-France-Hawaii Telescope in the g' band. It reached thesurface-brightness limit of 29 mag/arcsec2. In addition, we reanalyzed anarchival HST image of the galaxy.  Results. We detected up to 42 shells in NGC 3923. This is by far the highestnumber among all shell galaxies. We present the description of the shells andother tidal features in the galaxy. A probable progenitor of some of thesefeatures was discovered. The shell system likely originates from two or moreprogenitors. The predicted shell was not detected, but the new image revealedthat the prediction was based on incorrect assumptions and poor data.

Deep imaging of the shell elliptical galaxy NGC3923 with MegaCam