  Context: The nearby pair of solar-type stars Alpha Centauri is a favorable
target for an imaging search for extrasolar planets. Indications exist that the
gravitational mass of Alpha Cen B could be higher than its modeled mass, the
difference being consistent with a substellar companion of a few tens of
Jupiter masses. However, Alpha Centauri usually appears in star catalogues
surrounded by a large void area, due to the strong diffused light. Aims: We
searched for faint comoving companions to Alpha Cen located at angular
distances of the order of a few tens of arcseconds, up to 2-3 arcmin. As a
secondary objective, we built a catalogue of the detected background sources.
Methods: In order to complement our adaptive optics search at small angular
distances (Paper I), we used atmosphere limited CCD imaging from the NTT-SUSI2
instrument in the Bessel V, R, I, and Z bands. Results: We present the results
of our search in the form of a catalogue of the detected objects inside a 5.5
arcmin box around this star. A total of 4313 sources down to mV~24 and mI~22
were detected from this wide-field survey. We extracted the infrared photometry
of part of the detected sources from archive images of the 2MASS survey (JHK
bands). We investigate briefly the nature of the detected sources, many of them
presenting extremely red color indices (V-K > 14). Conclusions: We did not
detect any companion to Alpha Centauri between 100 and 300 AU, down to a
maximum mass of ~15 times Jupiter. We also mostly exclude the presence of a
companion more massive than 30 MJup between 50 and 100 AU.
