Table 1.
Spectroscopic parameters of the observed lines.
| Molecule | Transition | Rest frequency | Eup | TMB | vLSR | FWHM | W | Ntot (a) |
|---|---|---|---|---|---|---|---|---|
| (MHz) | (K) | (K) | (km s−1) | (km s−1) | (K km s−1) | 1012 cm−2 | ||
| H13CN | J = 1-0 F = 2-1 | 86340.1666(1) | 4.1 | 0.53(6) | 7.14(2) | 0.51(4) | 0.28(2) | 3.19(2) |
| HC15N | N = 1-0 | 86054.9664(1) | 4.1 | 0.235(6) | 7.18(1) | 0.49(1) | 0.120(2) | 0.56(3) |
| HN13C | N = 1-0  -F1 = 1-0 |
87090.675(4) (b) | 4.2 | 0.41(1) | 7.143(3) | 0.25(2) | 0.10(1) | 2.5(2) |
| H15NC | N = 1-0 | 88865.676(5) (c) | 4.3 | 0.67(2) | 7.257(4) | 0.425(8) | 0.302(7) | 1.0(2) |
| CN | N= 1-0 J = 1/2-1/2 F = 1-1 | 113123.370(5) | 5.4 | 0.87(2) | 7.109(4) | 0.465(8) | 0.427(6) | 517(7) |
| 13CN | N = 1-0 J = 3/2-1/2 F1 = 2-1 F = 3-2 | 108780.20(5) | 5.2 | 0.13(8) | 7.18(1) | 0.39(3) | 0.057(3) | 2.7(1) |
| C15N | N = 1-0 J = 3/2-1/2 F = 2-1 | 110024.6(1) | 5.3 | 0.056(1) | 7.09(2) | 0.38(6) | 0.023(4) | 0.48(6) |
Notes. Numbers in parentheses denote 1σ uncertainties in the unit from the last quoted digit. The frequencies in the table are reported in the CDMS and JPL catalogues (Müller et al. 2005; Pickett et al. 1998) and are derived from the laboratory work in Fuchs et al. (2004), Creswell et al. (1976), van der Tak et al. (2009), Bogey et al. (1984), Klisch et al. (1995), and the interstellar detection reported in Saleck et al. (1994).
Column densities computed towards the dust peak assuming Tex = 3.5 K for HCN isotopologues, Tex = 4.5 K for HNC isotopologues, and Tex = 4.2 K for CN isotopologues (Padovani et al. 2011; Hily-Blant et al. 2013a, 2013b).
One of the four ‘effective’ hyperfine components following the description of van der Tak et al. (2009).
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