Molecular absorption lines toward star-forming regions: a comparative study of HCO+, HNC, HCN, and CN

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Table 3:

Excitation temperatures inferred from the $\tau _{{\rm HCO}^{+} (1-2)}/\tau _{{\rm HCO}^{+} (0-1)}$ ratio.
Source	$T_{\rm ex}$ (K)	errors^a (K)
		+	-
G10.62-0.38	3.0	1.4	0.5
G34.3+0.1	3.0	8.4	0.8
W49N	2.7	0.8	0.4
W51	2.9	1.1	0.5

Notes. ^(a) The errors are derived from the results of numerical calculation which do not take into account the lower limit of 2.73 K set by the cosmic microwave background.

Source LaTeX | All tables | In the text

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