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We present a deep BVrIK multicolor catalog of galaxies in the field of thehigh redshift (z=4.7) quasar BR 1202-0725. Reliable colors have been measuredfor galaxies selected down to R=25. The choice of the optical filters has beenoptimized to define a robust multicolor selection of galaxies at 3.8<z< 4.5.Within this interval the surface density of galaxy candidates with z~4 in thisfield is 1 arcmin^{-2}. Photometric redshifts have been derived for thegalaxies in the field with the maximum likelihood analysis using the GISSELlibrary of ~10^6 synthetic spectra. The accuracy of the method used has beendiscussed and tested using galaxies in the Hubble Deep Field (HDF) with knownspectroscopic redshifts and accurate photometry. A peak in the redshiftdistribution is present at z~0.6 with relatively few galaxies at z>1.5. Atvariance with brighter surveys (I<22.5) there is a tail in the distributiontowards high redshifts up to z~4. The luminosity function at z~0.6 shows asteepening for M_B>-19. The observed cosmological ultraviolet luminositydensity is computed in the overall redshift interval z=0.3-4.5 reaching a value2x10^{19} W/Hz/Mpc^3 at z~0.8. We have derived in a homogeneous way, using theGISSEL libraries, the physical parameters connected with the fitted spectralenergy distributions. The bulk of the blue intermediate redshift populationwith z=0.4-1 mostly consists of very young star-forming galaxies with a medianstarburst age of the order of a few 10^8 yr and typical mass in luminous stars~2x10^8 Mo.Comment: 14 pages, 3 tables, 11 figures, Astronomical Journal in pres

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The Photometric Redshift Distribution and Evolutionary Properties of Galaxies up to [CLC][ITAL]z[/ITAL][/CLC] ∼ 4.5 in the Field of the Quasar BR 1202−0725