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Table 1

Spectral lines detected in the slim filaments.

Molecule Transition Rest frequency Eu / k N(a)crit
(MHz) (K) (cm−3)
SiO 5–4 217104.98 31.3 2.6×106
c-C3H2 61,6–50,5 217822.15 38.6 4.5×107
H2CO 30,3 −20,2 218222.19 21.0 3.4×106
HC3N 24−23 218324.72 131.0 1.7×107
CH3OH 42,2−31,2 218440.06 45.5 7.8×107
HNCO 100,10−90,9 219798.27 58.0 7.6×106
H213 CO 31,2−21,1 219908.53 32.9 4.8×106
SO 65−54 219949.44 35.0 2.3×106
CH3CN 121−111 220743.01 76.0 4.5×106
120−110 220747.26 68.9 4.1 ×106

Notes. (a)The critical density is calculated based on Einstein coefficients Aul and collisional rate coefficients Cul from the Leiden Atomic and Molecular Database (LAMDA, Schöier et al. 2005): via the approximation ncrit = Aul/Cul (Shirley 2015) at a temperature of ~100 K. For the case of H213CO, we give the critical density for the 31,2−21,1 transition of the main isotope.

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