Table 2
Values for the parameters used in Eqs. (7) and (8), plus those varied during MCMC modelling for N2H+ and its 15N isotopologues.
| Line | Region | FWHM | VLSR | Tex | Total integrated area | Opacity |
|---|---|---|---|---|---|---|
| [km s−1] | [km s−1] | [K] | [K km s−1] | |||
| H13CN | E region | 9.9 ± 3.7 | 11.4 | 40 ± 5 | 4.8 ± 0.5 | (8.2 )E-03 |
| NW region | 11.73 ± 0.59 | 11.4 | 40 ± 5 | 8.2 ± 0.8 | (1.4 )E-02 |
|
| NE region | 12.8 ± 1.2 | 11.4 | 40 ± 5 | 6.2 ± 0.6 | (1.0 )E-02 |
|
| S region | 11.34 ± 0.39 | 11.4 | 40 ± 5 | 6.0 ± 0.6 | (1.00 )E-02 |
|
| FIR3 | 10.6 ± 2.7 | 11.4 | 40 ± 5 | 4.7 ± 0.5 | (6.3 )E-03 |
|
| HC15N | E region | 9.6 ± 3.7 | 11.4 | 40 ± 5 | 0.36 ± 0.04 | (9.0 )E-04 |
| NW region | 13.20 ± 0.38 | 11.4 | 40 ± 5 | 1.2 ± 0.1 | (2.4 )E-03 |
|
| NE region | 12.5 ± 1.2 | 11.4 | 40 ± 5 | 1.2 ± 0.1 | (2.7 )E-03 |
|
| S region | 11.74 ± 0.89 | 11.4 | 40 ± 5 | 0.92 ± 0.09 | (2.0 )E-03 |
|
| FIR3 | 12.85 ± 1.5 | 11.4 | 40 ± 5 | 1.2 ± 0.1 | (2.4 )E-03 |
|
| 15NNH+ | E region | 0.80 | 11.67 (a) | 40.0 |
0.067 ± 0.007 | (1.2 )E-03 |
| NW region | 0.81 |
11.31 |
40.0 |
0.14 ± 0.01 | 0.1± 0.4 | |
| NE region | 0.79 |
11.2 |
40.0 |
0.085 ± 0.009 | 0.1 ± 0.3 | |
| S region | 0.79 |
11.5 |
39.7 |
0.13 ± 0.01 | 0.1 ± 0.9 | |
| N15NH+ | E region | 0.80 | 10.30 (a) | 40.0 |
0.10 ± 0.01 | (2.1 )E-03 |
| NW region | 0.80 |
11.4 |
40.0 |
0.13 ± 0.01 | 1.4 ± 1.4 | |
| NE region | 0.83 |
11.3 |
40.4 |
0.059 ± 0.006 | 0.1 ± 0.9 | |
| S region | 0.80 | 10.67 (a) | 40.0 |
0.11 ± 0.01 | 0.1 ± 0.3 | |
| N2H+ | E region | 0.78 |
11.49 |
38.6 |
23 ± 2 | 3.20 ± 0.08 |
| NW region | 0.75 |
11.11 |
38.4 |
36 ± 4 | 6.50 ± 0.06 | |
| NE region | 0.97 |
11.18 |
43.8 |
30 ± 3 | 4.95 ± 0.06 | |
| S region | 1.2 |
11.2 |
37.9 |
33 ± 3 | 5.550 ± 0.004 | |
Notes. Calibration errors of 10 and 15% were used in calculations involving the CLASS and MCMC models, respectively. We note that, due to the low spectral resolution, the HFS structure cannot be constrained for HCN isotopologues and so the spectra are fit with one transition only, the FWHM of which is included in this table for each region. Also, for this reason, VLSR is fixed to the accepted source value of 11.4 km s−1. The RMS was 5.1 mK for H13CN, 4.4 mK for HC15N, 10.1 mK for 15NNH+, 10.3 mK for N15NH+ and 31 mK for N2H+. (a)Due to low S/N, VLSR is fixed to the value found from a single Gaussian fit of the strongest HF component using L-M fitting.
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