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Table A.1.

Spectroscopic information on the observed transitions.

Rest freq. (a) δv(b) Aul(c) gu(d) R. I. (e)
MHz km s−1 s−1
HCN
354503.869 1.360 1.284 (−4) 9 2.083 (−2)
354505.367 0.094 1.886 (−3) 7 2.381 (−1)
354505.477 0.000 1.925 (−3) 9 3.125 (−1)
354505.523 −0.039 2.054 (−3) 11 4.075 (−1)
354505.846 −0.312 2.620 (−6) 7 3.307 (−4)
354507.455 −1.672 1.650 (−4) 7 2.083 (−2)
H13CN
345338.160 −1.398 1.190(−4) 9 2.089(−2)
345339.660 −0.095 1.740(−3) 7 2.376(−1)
345339.770 0.000 1.780(−3) 9 3.125(−1)
345339.810 0.035 1.900(−3) 11 4.077(−1)
345340.140 0.321 2.420(−6) 7 3.305(−4)
345341.750 1.719 1.530(−4) 7 2.089(−2)
HC15N
344200.109 0.000 1.8793(−3) 9 1

Notes. Numbers are written in the form a(b) = a × 10b.

(a)

Rest frequency.

(b)

δv is the velocity shift of each hf transition within a given multiplet.

(c)

Coefficient for spontaneous decay.

(d)

Upper level total degeneracy.

(e)

The relative intensity of each hf line, normalized to a sum of 1.

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