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OMC-2 FIR 4 is one of the closest known young intermediate-massprotoclusters, located at a distance of 420 pc in Orion. This region is one ofthe few where the complete 500-2000 GHz spectrum has been observed with theheterodyne spectrometer HIFI on board the Herschel satellite, and unbiasedspectral surveys at 0.8, 1, 2 and 3 mm have been obtained with the JCMT andIRAM 30-m telescopes.  In order to investigate the morphology of this region, we used the IRAMPlateau de Bure Interferometer to image OMC-2 FIR 4 in the 2-mm continuumemission, as well as in DCO+(2-1), DCN(2-1), C34S(3-2), and several CH3OHlines. In addition, we analysed observations of the NH3(1,1) and (2,2)inversion transitions made with the Very Large Array of the NRAO. The resultingmaps have an angular resolution which allows us to resolve structures of 5",equivalent to 2000 AU.  Our observations reveal three spatially resolved sources within OMC-2 FIR 4,of one or several solar masses each, with hints of further unresolvedsubstructure within them. Two of these sources have elongated shapes and areassociated with dust continuum emission peaks, thus likely containing at leastone molecular core each. One of them also displays radio continuum emission,which may be attributed to a young B3-B4 star that dominates the overallluminosity output of the region. The third source identified displays aDCO+(2-1) emission peak, and weak dust continuum emission. Its higher abundanceof DCO+ relative to the other two regions suggests a lower temperature andtherefore its possible association with either a younger low-mass protostar ora starless core. It may alternatively be part of the colder envelope of OMC-2FIR 4.  Our interferometric observations evidence the complexity of this region,where multiple cores, chemical differentiation and an ionised region allcoexist within an area of only 10000 AU.

High angular resolution observations towards OMC-2 FIR 4: Dissecting an intermediate-mass protocluster