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We used the large binocular camera (LBC) mounted on the large binoculartelescope (LBT) to observe the Lockman Hole in the U, B, and V bands. Ourobservations cover an area of 925 sq.arcmin. We reached depths of 26.7, 26.3,and 26.3 mag(AB) in the three bands, respectively, in terms of 50% sourcedetection efficiency, making this survey the deepest U-band survey and one ofthe deepest B and V band surveys with respect to its covered area. We extracteda large number of sources (~89000), detected in all three bands and examinedtheir surface density, comparing it with models of galaxy evolution. We findgood agreement with previous claims of a steep faint-end slope of theluminosity functions, caused by late-type and irregular galaxies at z>1.5. Apopulation of dwarf star-forming galaxies at 1.5<z<2.5 is needed to explain theU-band number counts. We also find evidence of strong supernova feedback athigh redshift. This survey is complementary to the r, i, and z Lockman Holesurvey conducted with the Subaru telescope and provides the essentialwavelength coverage to derive photometric redshifts and select different typesof sources from the Lockman Hole for further study.

Deep U-B-V imaging of the Lockman Hole with the LBT. Observations and number counts