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Fig. 11

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Average spectrum of the CH3OH line at 266.838 GHz observed from 3.7 to 6.7 February 2023 in comet C/2022 E3 at the same time as HCN(3–2). The model in blue assumes a production rate of 5.6 × 1026 molecules s−1 at 0.76 km s−1 on the sunward hemisphere and 2.8 × 1026 molecules s−1 at 0.52 km s−1 on the other hemisphere, as depicted in the upper right, while the red profile comes from symmetric outgassing at 0.68 km s−1 and same total production rate (8.4 × 1026 molecules s−1). The model in purple uses the same variable velocities in both hemispheres as in Fig. 10, with production rates of 6.4 × 1025 molecules s−1and 2.0 × 1025 molecules s−1, in sunward and other hemispheres, respectively. The mean phase angle is ~45°. The vertical axis is main beam brightness temperature in K, and the horizontal axis is Doppler velocity in the rest frame of the comet.

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