Panel a: 82 GHz continuum emission obtained with IRAM NOEMA towards OMC-2 FIR4. The first contour level is at 1.8 × 10-3 Jy beam-1, corresponding to the 3σ rms level of the map, and the others are 2, 3, 5, 8, and 10 times the 3σ rms level. The white solid circle shows the NOEMA field of view, while the dashed one is the IRAM-30 m HPBW (~30′′). The triangles indicate the position of FIR3, FIR4 and FIR5, while the open star corresponds to the mid-IR protostar detected at 8, 24, and 70 μm by Furlan et al. (2014). Panel b: integrated intensity map of HC5N (31–30) obtained from the Widex correlator integrated in the velocity channels with signal. The contour levels are 3, 5, and 7 times the 1σ rms of the map, equal to ~ 8.9 × 10-4 Jy beam-1. The solid circle (in this panel and in all panels from b) to f) represents the NOEMA field of view (equal to the white circle in panel a. Panel c: integrated intensity map of HC3N (9–8). Both the first level and step correspond to the 3σ rms value of the integrated map (1σ ~ 6.3 × 10-3 Jy beam-1). Panels d–f: map of HC5N (31–30) obtained averaging the emission in the three different velocity ranges indicated in the top right corner extracted from the Narrow correlator unit. In all panels, both the first contour level and step correspond to the 3σ rms value of the total integrated map, showed in panel f (1σ ~ 3.6 × 10-3 Jy beam-1). Finally, in panels c and f, the red and white contours correspond to the emitting region of HC3N towards FIR4 with high and low HC5N emission, respectively. From these contours, we have extracted the spectra discussed in Sect. 4. The blue contour indicates FIR5 as detected in the total integrated map of HC5N (panel f).
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