Table 1
Parameters of the targeted lines.
| Transition | Frequency(a) | Aul(a) | gu(a) | Eu(a) | ncrit(b) | θMB | ηMB | ΔVch | rms | Vlsr(c) | FWHM(c) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MHz | × 10−3 s−1 | K | 106 cm−3 | ′′ | km s−1 | mK | km s−1 | km s−1 | |||
| N2H+ 3 − 2 | 279511.7491 | 1.26 | 63 | 26.8 | 1.4 | 22.3 | 0.76 | 0.07 | 52 | 5.612(5) | 0.397(13) |
| N2H+ 5 − 4 | 465824.7770 | 6.18 | 99 | 67.1 | 5.5 | 13.3 | 0.60 | 0.04 | 33 | 5.661(6) | 0.747(11) |
| N2D+ 3 − 2 | 231321.8283 | 7.14 × 10−1 | 63 | 22.2 | 0.74 | 26.0 | 0.80 | 0.08 | 9 | 5.6543(2) | 0.3889(12) |
| N2D+ 4 − 3 | 308422.2672 | 1.75 | 81 | 37.0 | 1.5 | 20.2 | 0.74 | 0.06 | 37 | 5.663(6) | 0.43(3) |
| N2D+ 6 − 5 | 462603.8520 | 6.15 | 117 | 77.7 | 4.4 | 13.5 | 0.60 | 0.04 | 29 | 5.61(3) | 0.57(7) |
Notes. (a)The spectroscopic information. The line frequency, Einstein coefficient for spontaneous emission Aul, upper-level degeneracy gu, and energy Eu are taken from the CDMS catalogue (Müller et al. 2005). They refer to the unsplitted rotational transitions. (b)The line critical density was computed with Eq. (4) of Shirley (2015) using the collisional rates of the unsplitted lines. (c)Kinematic parameters were obtained with the HFS fit. The numbers in parentheses are the uncertainties on the last digit.
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