Table 1
Rotational temperatures and inferred gas kinetic temperatures.
UT (mm/dd.d) | Molecule | Freq. range (GHz) | lines (c) | off. (a) (″) | Trot (b) (K) | Tgas (K) |
---|---|---|---|---|---|---|
C/2021 A1 (Leonard) | ||||||
11/15.9 | CH3OH | 250–254 | 12 | 1.4 | 23 ± 5 | 26 ± 6 |
11/14.8 | CH3OH | 165–169 | 6 | 1.5 | 22 ± 9 | 21 ± 9 |
12/12.8 | CH3OH | 241.8 | 13 | 1.6 | 54.1 ± 7.1 | 63 ± 8 |
12/10.6 | CH3OH | 250–254 | 20 | 1.7 | 65.3 ± 5.2 | 70 ± 6 |
12/11.1 | CH3OH | 165–169 | 10 | 1.9 | 56.0 ± 6.9 | 56 ± 7 |
12/10.6 | CH3OH | 250–267 | 5 | 1.7 | 54.4 ± 7.3 | 55 ± 7 |
12/12.5 | HNCO | 153–264 | 9 | 1.5 | 30.4 ± 3.6 | 37 ± 6 |
12/12.5 | HNCOd(d) | 37.0 ± 5.4 | 48 ± 7 | |||
12/11.1 | CH3CN | 147–165 | 11 | 1.9 | 53 ± 11 | 53 ± 10 |
12/12.8 | CH3CN | 220–257 | 13 | 1.7 | 62.9 ± 9.3 | 63 ± 9 |
12/12.5 | NH2CHO | 213–267 | 25 | 1.5 | 116 ± 59 | 102 ± 52 |
C/2022 E3 (ZTF) | ||||||
02/05.2 | CH3OH | 165–169 | 10 | 2.0 | 53.0 ± 1.7 | 55 ± 2 |
9.1 | 51.5 ± 6.3 | 57 ± 7 | ||||
13.0 | 53.5 ± 7.8 | 63 ± 10 | ||||
02/05.2 | CH3OH | 165–169 | v-(e) | 2.0 | 52.3 ± 1.9 | 54 ± 2 |
v+ | 2.0 | 55.0 ± 3.5 | 58 ± 4 | |||
02/04.6 | CH3OH | 250–254 | 28 | 1.6 | 58.4 ± 1.6 | 63 ± 2 |
22 | 9.8 | 48.7 ± 4.6 | 59 ± 6 | |||
02/04.6 | CH3OH | 250–267 | 5 | 1.6 | 54.3 ± 1.9 | 56 ± 2 |
02/05.1 | CH3OH | 241.8 | 14 | 1.8 | 42.2 ± 1.4 | 54 ± 3 |
02/05.1 | CH3CN | 257 | 4 | 1.8 | 68 ± 16 | 68 ± 16 |
02/05.2 | CH3CN | 147–165 | 12 | 2.1 | 52.3 ± 4.0 | 73 ± 8 |
02/05.8 | CH3CN | 220–239 | 9 | 2.7 | 47.4 ± 9.2 | 54 ± 13 |
02/05.2 | NH2CHO | 149–265 | 40 | 2.1 | 79 ± 14 | 84 ± 15 |
02/05.2 | HNCO | 153–264 | 12 | 2.1 | 50 ± 9 | 76 ± 13 |
02/05.2 | HCOOH | 151–270 | 29 | 2.1 | 49 ± 9 | 49 ± 9 |
02/05.2 | CH3CHO | 151–271 | 79 | 2.1 | 43 ± 6 | 44 ± 6 |
Notes. Subscript “d” has been added to the molecules for which a daughter Haser density profile is assumed with the parent scale length provided below. (a)Mean pointing offset. (b)Result of non-linear fit with χ2 minimisation. (c)Number of lines used for the determination of Trot. In some cases lines have been averaged by groups of two lines having similar spectral characteristics (same J level, close energy levels and Einstein A coefficients).(d)Assuming a distributed source with a parent scale length of Lp=5000 km.(e)Temperatures deduced from the negative (blueshifted) part of the line (respectively positive or redshifted side for v+) sampling mostly the day-side of the coma (respectively night-side).
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