PRANDONI, ISABELLAISABELLAPRANDONIGuglielmino, G.G.GuglielminoMorganti, R.R.MorgantiVaccari, M.M.VaccariMaini, A.A.MainiRöttgering, H. J. A.H. J. A.RöttgeringJarvis, M. J.M. J.JarvisGarrett, M. A.M. A.Garrett2020-10-062020-10-0620180035-8711http://hdl.handle.net/20.500.12386/27596This paper is part of a series discussing the results obtained in the framework of a wide international collaboration - the Lockman Hole Project - aimed at improving the extensive multiband coverage available in the Lockman Hole region, through novel deep, wide-area, multifrequency (60, 150, 350 MHz, and 1.4 GHz) radio surveys. This multifrequency, multiband information will be exploited to get a comprehensive view of star formation and active galactic nucleus activities in the high-redshift Universe from a radio perspective. In this paper, we present novel 1.4 GHz mosaic observations obtained with the Westerbork Synthesis Radio Telescope. With an area coverage of 6.6 deg<SUP>2</SUP>, this is the largest survey reaching an rms noise of 11 μJy beam<SUP>-1</SUP>. In this paper, we present the source catalogue (∼6000 sources with flux densities S ≳ 55 μJy (5σ), and we discuss the 1.4 GHz source counts derived from it. Our source counts provide very robust statistics in the flux range 0.1< S< 1 mJy, and are in excellent agreement with other robust determinations obtained at lower and higher flux densities. A clear excess is found with respect to the counts predicted by the semi-empirical radio sky simulations developed in the framework of the Square Kilometre Array Simulated Skies project. A preliminary analysis of the identified (and classified) sources suggests this excess is to be ascribed to star-forming galaxies, which seem to show a steeper evolution than predicted.STAMPAenArticle10.1093/mnras/sty25212-s2.0-85060922877000454575100024https://academic.oup.com/mnras/article-abstract/481/4/4548/5108199?redirectedFrom=fulltext2018MNRAS.481.4548PFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation