Table 1
CH3OH and CH3 CHO emission lines observed using NOEMA and the WideX backend towards the L1157-B1b peak (see Fig. 2).
| Transition (a) | ν0 (a) | Eu (a) | Sμ2 (a) | log(Aij) (a) | rms | Iint (b) | Trot | Ntot |
|---|---|---|---|---|---|---|---|---|
| (GHz) | (K) | (D2) | (mK) | (K km s−1) | (K) | (cm−2) | ||
| CH3OH | 10.0(1.1) | 1.3(0.3) × 1016 | ||||||
| 21,2–11,1 A | 95.91431 | 21 | 1.2 | –5.6 | 14 | 9.05(0.15) | ||
| 2−1,2–1−1,1 E (c) | 96.73936 | 13 | 1.2 | –4.6 | 9 | 40.5(1.5) (d) | ||
| 20,2–10,1 A (c) | 96.74138 | 7 | 1.6 | –5.6 | 9 | 57.2(1.5) (d) | ||
| 20,2–10,1 E (c) | 96.74455 | 20 | 1.6 | –5.5 | 9 | 19.0(0.5) (d) | ||
| 21,1–11,0 E | 96.75551 | 28 | 1.2 | –5.5 | 9 | 6.69(0.09) | ||
| 21,1–11,0 A | 97.58280 | 22 | 1.2 | –5.6 | 11 | 12.82(0.13) | ||
| CH3CHO | 8(1) | 7(3) × 1013 | ||||||
| 50,5–40,4 E | 95.94744 | 14 | 63.2 | –4.5 | 5 | 1.71(0.14) | ||
| 50,5–40,4 A | 95.96346 | 14 | 63.2 | –4.5 | 7 | 1.65(0.15) | ||
| 52,4–42,3 A | 96.27425 | 23 | 53.1 | –4.6 | 8 | 0.65(0.15) | ||
| 52,4–42,3 E | 96.42561 | 23 | 52.8 | –4.6 | 9 | 0.40(0.08) | ||
| 52,3–42,2 E | 96.47552 | 23 | 52.8 | –4.6 | 11 | 0.44(0.16) | ||
| 52,3–42,2 A | 96.63266 | 23 | 53.1 | –4.6 | 12 | 0.42(0.09) | ||
| 51,4–41,3 E | 98.86331 | 17 | 60.7 | –4.5 | 12 | 1.42(0.19) | ||
| 51,4–41,3 A | 98.90094 | 17 | 60.7 | –4.5 | 9 | 1.50(0.12) | ||
Notes. (a)Frequencies and spectroscopic parameters were extracted from the Jet Propulsion Laboratory molecular database (Pickett et al. 1998) for CH3CHO and CH3OCHO. Upper level energies refer to the ground state of each symmetry. (b)Integrated over the whole velocity emission range from the WideX spectra extracted at the CH3 CHO and CH3OH emission peak (B1b; see text). In case of non-detections we report the 3σ limit. We note that the errors on the integrated areas Iint are propagated using the rms and the spectral resolution of the spectra. In addition, the uncertainty on the absolute flux scale due to calibration is ≤ 15% (see Sect. 3). (c) The three lines at 96.74 GHz have been deblended using the 0.5 km s−1 spectral resolution (see Sect. 3.2 and Fig. 4).
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