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Table 3

Spectral parameters and fit results of the detected iCOM emission lines observed using the NOEMA WideX backend toward the IRAS 4A outflow peaks (see text and Table 2).

Transition Spectral parameters Outflow SE Outflow SW Outflow North Region As (a)





Frequency (b) Eup (b) logAij (b) Area (c) Tpeak RMS (d) Area (c) Tpeak RMS (d) Area (c) Tpeak RMS (d) Area (c) Tpeak RMS (d)
[GHz] [K] [K km s−1 ] [K] [mK] [K km s−1] [K] [mK] [K km s−1] [K] [mK] [K km s−1] [K] [mK]
CH3OH

21,2 –11,1 A 95.91431 21.4 −5.6 17.1(0.9) 1.4 20 2.7(0.3) 0.4 20 5.1(0.5) 0.4 20 ≤0.5 ≤0.05 30
2-1,2 –1-1,1 E (e) 96.73936 12.5 −4.6 199 (4) 12 20 69(4) 5 30 48(4) 3 20 37(1) 2.5 30
20,2 –10,1 A (e) 96.74138 6.9 −5.6
20,2 –10,1 E (e) 96.74454 20.1 − 5.5
21,1 –11,0 E 96.75550 28.0 −5.5 11.2(0.3) 0.9 20 2.0(0.2) 0.3 30 3.2(0.3) 0.2 20
21,1 –11,0 A 97.58280 21.6 −5.6 21.5(0.2) 1.9 20 2.5(0.3) 0.3 30 4.4(0.3) 0.4 30 ≤0.5 ≤0.05 30

CH3CHO

50,5 –40,4 E 95.94744 13.9 −4.5 3.9(0.2) 0.4 20 ≤0.6 ≤0.06 20 0.8(0.4) 0.1 20 ≤0.5 ≤0.05 30
50,5 –40,4 A 95.96346 13.8 −4.5 3.7(0.3) 0.4 20 1.7(0.4) 0.1 20 1.3(0.5) 0.1 20 ≤0.5 ≤0.05 30
52,4 –42,3 A 96.27425 22.9 −4.6 1.1(0.4) 0.1 30 0.7(0.3) 0.07 20 1.0(0.2) 0.1 30 0.5(0.3) 0.1 20
52,4 –42,3 E 96.42561 22.9 −4.6 1.1(0.2) 0.2 30 ≤0.7 ≤0.07 20 0.8(0.3) 0.06 30 ≤0.3 ≤0.03 20
52,3 –42,2 E 96.47552 23.0 −4.6 0.8(0.2) 0.1 20 ≤0.7 ≤0.07 20 ≤0.8 ≤0.08 30 ≤0.3 ≤0.03 20
52,3 –42,2 A 96.63266 23.0 −4.6 1.5(0.3) 0.1 20 ≤0.7 ≤0.07 20 ≤0.8 ≤0.08 30 ≤0.3 ≤0.03 20
51,4 –41,3 E 98.86331 16.7 −4.5 2.3(0.4) 0.2 20 1.6(0.8) 0.1 20 2.1(0.5) 0.2 30 2.8(0.6) 0.1 20
51,4 –41,3 A 98.90094 16.5 −4.5 2.5(0.5) 0.2 20 ≤0.6 ≤0.06 20 1.9(0.3) 0.2 30 2.0 (0.3) 0.1 20

CH3OCH3

41,4 –30,3 EA (e) 99.32443 10.2 − 5.3 ≤ 0.2 ≤ 0.02 15 ≤0.3 ≤0.03 15 2.1(0.3) 0.12 15 1.8(0.5) 0.09 15
41,4 –30,3 AE (e) 99.32443 10.2 −5.3
41,4 - 30,3 EE (e) 99.32521 10.2 −5.3
41,4 –30,3 AA (e) 99.32607 10.2 −5.3

NH2 CHO (f)

41,4 –31,3 81.69354 12.8 − 4.5 ≤ 0.2 ≤ 0.02 7 ≤0.1 ≤0.01 7 ≤0.06 ≤0.006 7 0.4(0.1) 0.04 10

Notes. (a) Region where formamide and dimethyl ether emits (Ceccarelli et al. 2017). (b) Frequencies and spectroscopic parameters are retrieved from the JPL (Jet Propulsion Laboratory; Pickett et al. 1998) molecular database and from the CDMS (Cologne Database for Molecular Spectroscopy; Müller et al. 2005): for CH3 OH by Xu et al. (2008), for CH3 CHO by Kleiner et al. (1996), for CH3 CHO3 by Neustock et al. (1990), for NH2CHO by Kirchhoff et al. (1973). Upper level energies refer to the ground state of each symmetry. (c) Mean velocity–integrated line flux over the whole velocity emission range from the spectra extracted at the CH3 CHO and CH3OH transitions at each outflow peaks (see Table 2). In case of non–detection we report the 3σ limit. The lines are centered at ~3 km s−1, ~1 km s−1, ~11 km s−1 for outflow SE, SW and North respectively, in agreement with the expected outflow velocity (Santangelo et al. 2015) given the WideX channel resolution ( ~6 km s−1). (d) The rms is computed over a 200 km s−1 band around each line. (e) These lines are blended together at the WideX resolution ( ~2 MHz), therefore they are not used for the non-LTE analysis. (f)From Setup 1.

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