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Fig. 2


Top panels: full spectrum observed with the IRAM 30 m telescope towards the cold dense core in TMC-1C. The mean rms noise level is ~2 mK. Most of the detected lines emit only in one channel (channel width 0.5–0.7 km s-1), suggesting that the linewidth of the different lines is 0.7 km s-1 (see Sect. 3.2). Bottom panels: close-up views of the frequency ranges around the brightest transitions of the CO-H2 van der Waals complex. The corresponding frequencies are listed in Table 1, and are shown in the panels with a vertical dotted line. The expected linewidth is 0.3 km s-1, as measured in higher spectral resolution observations (e.g. Spezzano et al. 2013).

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