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Table 2

Conversion factorsa.

Species x Transition Tex N(x)(τdv = 1.0 km s-1)
(GHz) (K) (cm-2)

NH 946.476 3.9 3.65  ×  1013 b
974.478 4.0 7.47  ×  1012 b
o-NH2 952.578 3.9 3.62  ×  1012 b
o-NH3 572.498 2.8 3.92  ×  1012 b
p-NH3 1215.245 4.9 1.65  ×  1013 b
NH+ 1012.524 4.2 6.48  ×  1012
CH 532.724 2.9 2.28  ×  1013 b
HNC 90.664 2.8 1.80  ×  1012 b
CN 113.169 2.8 1.90  ×  1013 b

Notes. 

(a)

The excitation temperatures and conversion factors from integrated opacity, τdv = 1.0 km s-1, to column densities, N(x), are calculated using RADEX with Tk = 30 K and n(H2) = 500 cm-3 which corresponds to nH ≳ 103 cm-3.

(b)

Integrated over all hfs components.

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