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Fig. 1.


Detection of mmCRLs toward the Orion Bar PDR. Left: map of the 13CO J = 3 – 2 integrated emission obtained with the IRAM 30 m telescope at a HPBW of 8″ (Cuadrado et al., in prep.). The blue dashed contours show the position of the H2 dissociation front traced by the H2v = 1 – 0 S(1) emission (from 1.5 to 4.5 × 10−4 erg s−1 cm−2 sr−1 in steps of 0.5 × 10−4 erg s−1 cm−2 sr−1; from Walmsley et al. 2000). Red contours show the [13C II] (2P3/22P1/2, F = 2–1) line emission at 1900.466 GHz mapped with Herschel/HIFI at a HPBW of 12″ (from 10 to 30 K km s−1 in steps of 2.5 K km s−1; from Goicoechea et al. 2015). Right: C41α and C39α recombination lines detected with the IRAM 30 m telescope toward three positions of the PDR. The cyan circles roughly represent the HPBW of our 3 mm-wave observations.

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