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Table 2

HCO 101–000 transitions observed and column density-optical depth conversionsa.

Frequency FF JJ A F,F N(X)/τdvb
MHz 10-6 s-1  cm-2  (km   s-1)-1

86 670.76 2–1 3/2–1/2 4.69 2.26 × 1013
86 708.36 1–0 3/2–1/2 4.60 3.84 × 1013
86 774.46c 1–1 1/2–1/2 4.61 3.84 × 1013
86 805.75 0–1 1/2–1/2 4.72 1.13 × 1014

Notes.

(a)

Spectroscopic data from www.splatalogue.net see Blake et al. (1984).

(b)

Assuming excitation in equilibrium with the cosmic microwave background.

(c)

This component was observed toward W49.

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