The physical and dynamical structure of Serpens - Two very different sub-(proto)clusters

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Table 4:

Critical densities ( $n_{\rm critical}$ ) at 10 K and 20 K for C¹⁸O.
C¹⁸O	$A_{{\rm u}}$	$K_{{\rm u}}$	$n_{\rm critical}$
transition	(s^-1)	(10^-11 cm³s^-1)	(10³ cm^-3)
		10 K-20 K	10 K-20 K
$J=1\rightarrow 0$	6.266 $\times$ 10^-8	3.3-3.3	1.9-1.9
$J=2\rightarrow 1$	6.011 $\times$ 10^-7	7.2-6.5	8.3-9.3
$J=3\rightarrow 2$	2.172 $\times$ 10^-6	7.9-7.1	27-30

These values were derived using the information provided by the Leiden Atomic and Molecular Database (Schoeier et al. 2005): $A_{{\rm u}}$ being the Einstein Coefficient for the upper level, and $K_{{\rm u}}$ the respective collision rate at both 10 K and 20 K.

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