Table 1
Frequencies and spectroscopic properties of the deuterated molecules and their corresponding 13C-isotopologs presented in this study alongside the spectral line properties obtained by averaging over the entire DR21 filament are presented.
| Species | Transition | Frequency (MHz) | Eup/k (K) | Aij (s−1) | ɡup | ncrit (cm−3) | Database | TMB (K) | υPeak(km s−1) | FWHM (km s−1) |
|---|---|---|---|---|---|---|---|---|---|---|
| DCO+ | J = 1–0 | 72039.312 | 3.46 | 2.2(−5) | 3 | 4.5(4) | CDMS | 0.08 ± 0.01 | −2.7 ± 0.8 | 3.0 ± 0.1 |
| DCO+ | J = 3–2 | 216112.582 | 20.74 | 7.1(−4) | 7 | 1.0(6) | CDMS | 0.14 ± 0.01 | −3.2 ± 0.8 | 3.4 ± 0.1 |
| H13CO+ | J = 1–0 | 86754.288 | 4.16 | 3.9(−5) | 3 | 4.5(4) | CDMS | 0.21 ± 0.01 | −3.0 ± 0.8 | 3.4 ± 0.0 |
| DNC | J = 1–0 | 76305.727 | 3.66 | 1.6(−5) | 3 | 1.1(5) | CDMS | 0.06 ± 0.01 | −3.0 ± 0.8 | 3.2 ± 0.1 |
| DNC | J = 2–1 | 152609.774 | 10.99 | 1.5(−4) | 5 | 1.0(6) | CDMS | 0.18 ± 0.01 | −2.7 ±4 0.8 | 3.6 ± 0.1 |
| HN13C | J = 1–0 | 87090.850 | 4.18 | 1.9(−5) | 3 | 1.1(5) | CDMS | 0.07± 0.01 | −3.0 ± 0.8 | 3.4 ± 0.1 |
| DCN | J = 1–0, F = 2–1(*) | 72414.694 | 3.48 | 1.3(−5) | 5 | 3.0(5) | JPL | 0.05 ± 0.01 | −3.1 ± 0.8 | 4.1 ± 0.1 |
| DCN | J = 3–2 | 217238.538 | 20.85 | 4.6(−4) | 21 | 1.0(7) | CDMS | 0.11 ± 0.01 | −3.8 ± 0.8 | 4.1 ± 0.1 |
| H13CN | J = 1–0, F = 2–1(*) | 86339.921 | 4.14 | 2.2(−5) | 5 | 3.0(5) | JPL | 0.11 ± 0.01 | −3.8 ± 0.8 | 4.1 ± 0.1 |
Notes. The frequency, upper level energy, Eup/k, Einstein coefficient, Aij, and upper state degeneracy gup, are given. The critical density, ncrit, at Tkin = 20 K, are also listed (Shirley 2015). The rightmost three column give the peak intensity, TMB, central LSR velocity and FWHM of Gaussian fits to a spectrum representing an average of the emission in the covered area in the DR21 region. The values for Aij and ncrit are written in the form of x(−a) = x × 10−a. The spectroscopic information is taken, as noted, from the Cologne Database for Molecular Spectroscopy (CDMS; Müller et al. 2001) or from the Jet Propulsion Laboratory Spectroscopic catalogue database(Pickett et al. 1998). (*)Denotes the spectroscopic properties of the strongest HFS component.
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