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We show the first interferometric maps of the 14N/15N ratio obtained with theAtacama Large Millimeter Array (ALMA) towards the Solar-like formingprotocluster OMC-2 FIR4. We observed N2H+, 15NNH+, N15NH+ (1-0), and N2D+(2-1), from which we derive the isotopic ratios 14N/15N and D/H. The target isone of the closest analogues of the environment in which our Sun may haveformed. The ALMA images, having synthesised beam corresponding to ~600 au, showthat the emission of the less abundant isotopologues is distributed in severalcores of ~10" (i.e. ~0.02~pc or 4000 au) embedded in a more extended N2H+emission. Overall, our results indicate that: (1) 14N/15N does not changeacross the region at core scales, and (2) 14N/15N does not depend ontemperature variations. Our findings also suggest that the 14N/15N variationsfound in pristine Solar System objects are likely not inherited from theprotocluster stage, and hence their reason has to be found elsewhere.

No nitrogen fractionation on 600 au scale in the Sun progenitor analogue OMC-2 FIR4