| Abstract
| - Aims. We present a deep multiwavelength imaging survey ( UGR) in 3 different fields, Q0933, Q1623, and COSMOS, for a total area of ~1500 arcmin 2. The data were obtained with the Large Binocular Camera on the Large Binocular Telescope. Methods. To select our Lyman-break galaxy (LBG) candidates, we adopted the well established and widely used color-selection criterion ( U − G vs. G − R). One of the main advantages of our survey is that it has a wider dynamic color range for U-dropout selection than in previous studies. This allows us to fully exploit the depth of our R-band images, obtaining a robust sample with few interlopers. In addition, for 2 of our fields we have spectroscopic redshift information that is needed to better estimate the completeness of our sample and interloper fraction. Results. Our limiting magnitudes reach 27.0( AB) in the R band (5 σ) and 28.6( AB) in the U band (1 σ). This dataset was used to derive LBG candidates at z ≈ 3 . We obtained a catalog with a total of 12 264 sources down to the 50% completeness magnitude limit in the R band for each field. We find a surface density of ~3 LBG candidates arcmin -2 down to R = 25.5 , where completeness is ≥95% for all 3 fields. This number is higher than the original studies, but consistent with more recent samples.
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