Table 1
Methanol maser transitions considered in our simulations and observational parameters.
| Spectral line | Frequency | TB lower limit (a) | TB (a) | Obs. linear | Obs. circular | Source and | Code | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (GHz) | (K) | (K) | (pol. %) | (pol. %) | references | ||||||||
| CH3OH 17−2 → 18−3 E (vt=1) | 6.18 | 2.2 × 106 | 5.2 × 1011 | 7.0 | <0.5 | G358.931–0.030 (b) | N&W92 | ||||||
| CH3OH 51 → 60 A+ (vt=0) | 6.68 | 7.6 × 106 | 1.5 × 1012 | 7.5 | 0.5 | G358.931–0.030 (b), | N&W94 | ||||||
| 2.8 × 1013 | 8.7 × 1013 | 8.1 | 2.1 | W3(OH) (c), | |||||||||
| 1.3 × 1012 | 6.3 × 1012 | 4.5 | 0.2 | W75N (c) | |||||||||
| CH3OH 124 → 133 A− (vt=0) | 7.68 | 4.5 × 106 | 6.5 × 1011 | 3.5 | <0.5 | G358.931–0.030 (b) | N&W92 | ||||||
| CH3OH 124 → 133 A+ (vt=0) | 7.83 | 4.5 × 106 | 6.3 × 1011 | 3.5 | <0.5 | G358.931–0.030 (b) | N&W92 | ||||||
| CH3OH 20 → 31 E (vt=0) | 12.2 | 109–1012 | – | – | – | W3(OH) (d) | N&W94 | ||||||
| CH3OH 176 → 185 E (vt=0) | 20.3 | 4.5 × 104 | 1.7 × 1010 | 4.0 | 2.0 | G358.931–0.030 (e) | N&W92 | ||||||
| CH3OH 101 → 112 A+ (vt=1) | 20.9 | 3.6 × 104 | 1.5 × 1011 | 7.0 | <0.5 | G358.931–0.030 (b) | N&W92 | ||||||
| CH3OH 52 → 51 E (vt=0) | 25.0 | 9.1 × 103 | 7.2 × 109 | – | 0.3 | OMC–1 (f) | N&W94 | ||||||
| CH3OH 4−1 → 30 E | 36.2 | 1.7 × 101 | 2.6 × 107 | <0.5 | <0.5 | G358.931–0.030 (b), | N&W94 | ||||||
| 3.7 × 104 | 3.4 × 109 | – | 0.1 | M8E (g) | |||||||||
| CH3OH 7−2 → 8−1 E (vt=0) | 37.7 | 8.7 × 103 | 1.2 × 1010 | 3.5 | 0.5 | G358.931–0.030 (b) | N&W92 | ||||||
| CH3OH 70 → 61 A+ | 44.1 | 1.2 × 102 | 3.15 × 108 | <0.5 | <0.5 | G358.931–0.030 (b), | N&W94 | ||||||
| 5.0 × 104 | 1.3 × 1010 | – | 0.05 | DR21W (h) | |||||||||
| CH3OH 20 → 31 E (vt=1) | 44.9 | 1.9 × 104 | 1.7 × 1010 | 2.5 | <0.5 | G358.931–0.030 (b) | N&W94 | ||||||
| CH3OH 93 → 102 E (vt=0) | 45.8 | 1.4 × 104 | 1.3 × 1010 | 7.0 | 1.5 | G358.931–0.030 (b) | N&W92 | ||||||
Notes. (a) Brightness temperatureis estimated using a maser spot size of 3 mas using Eqs. (7) and (8), while the lower limit is based on the observational details given in the source references. (b) From Breen et al. (2019). (c)For W3(OH) we refer to the feature W3OH.22 from Surcis et al. (2019), and for W75N to Surcis et al. (2009). (d) We do not model any specific maser but we only report values observed by Moscadelli et al. (2003). (e) From MacLeod et al. (2019). (f)We used the component 2 of the maser observed by Sarma & Momjian (2020). (g) From Sarma & Momjian (2009). (h)We used the component 1 of the maser observed by Momjian & Sarma (2019).
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