Table 2.
List of H2CO transitions in this study
| Transition | Rest frequency | Eu | Aul | Integrated intensity (GMC 3) | |
|---|---|---|---|---|---|
| [GHz] | [K] | [s−1] | [K km s−1] | ||
| o-H2CO | 212 − 111 | 140.839500 | 21.9 | 5.304E-05 | 104±16 |
| o-H2CO | 312 − 211 | 225.697800 | 33.4 | 2.772E-04 | 46.0±6.9 |
| o-H2CO | 414 − 313 | 281.526900 | 45.6 | 5.883E-04 | 42.5±6.4 |
| p-H2CO | 423 − 322 | 291.237800 | 82.1 | 5.210E-04 | 7.1±1.1 |
| o-H2CO | 432 − 331 | 291.380500 | 140.9 | 3.044E-04 | 15.6±2.3 |
| o-H2CO | 431 − 330 | 291.384300 | 140.9 | 3.044E-04 | |
| p-H2CO | 422 − 321 | 291.948100 | 82.1 | 5.249E-04 | 8.8±1.4 |
| o-H2CO | 515 − 414 | 351.768600 | 62.5 | 1.202E-03 | 27.6±4.1 |
| p-H2CO | 524 − 423 | 363.945900 | 99.5 | 1.165E-03 | 5.8±0.9 |
| p-H2CO | 523 − 422 | 365.363400 | 99.7 | 1.179E-03 | 4.7±0.7 |
Notes. Frequencies and spectroscopic parameters have been extracted from CDMS (Müller et al. 2005; Endres et al. 2016). The available data for H2CO are from Müller & Lewen (2017). Note that only transitions covered within ±150 km s−1 with respect to the main transition are listed as shown with vertical lines in Figure A.2 – these are considered to be the ‘contributors’ of the velocity-integrated intensities measured from the moment-0 maps. The main line refers to transitions with the lowest Eu in each frequency group. Measured integrated intensity values and their uncertainties for GMC 3 are provided as a reference. Integrated intensities measured towards the GMCs listed in Table 3 are available as a machine-readable table https://doi.org/10.5281/zenodo.15442733.
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