Table 1
Parameters of the targeted N2H+ and N2D+ lines.
| Transition | Frequency MHz | Aul × 10−3/s | gup | ncrit cm−3 | Eup K | θMB ″ | ηMB | ∆ V ch km s−1 | rms mK | Vlsr km s−1 | FWHM km s−1 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| N2 H+ 3−2 | 279511.7491 | 1.26 | 63 | 1.4×106 | 27 | 22.3 | 0.76 | 0.07 | 43 | 3.610(2) | 0.544(3) |
| N2 H+ 5−4 | 465824.7770 | 6.18 | 99 | 5.5×106 | 67 | 13.3 | 0.60 | 0.04 | 36 | 3.600(3) | 0.41(1) |
| N2 H+ 3−2 | 231321.8283 | 0.71 | 63 | 7.4×105 | 22 | 26.0 | 0.80 | 0.08 | 10 | 3.630(1) | 0.410(1) |
| N2 H+ 4−3 | 308422.2672 | 1.75 | 81 | 1.5×106 | 37 | 20.2 | 0.74 | 0.06 | 38 | 3.600(1) | 0.381(7) |
| N2 H+ 6−5 | 462603.8520 | 6.15 | 117 | 4.4×106 | 78 | 13.5 | 0.60 | 0.04 | 35 | 3.620(1) | 0.42(2) |
Notes. The spectroscopic information refers to the unsplit rotational transitions and is taken from the CDMS catalogue (Müller et al. 2005). The last two columns report the kinematic parameters obtained with the HFS fit. The line critical density is computed with Eq. (4) of Shirley (2015), using the collisional rates of the unsplit lines.
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