Methanol maps of low-mass protostellar systems - I. The Serpens molecular core

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Volume 516 (June-July 2010)

A&A, 516 (2010) A57

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Table 4:

Average total gas column densities and fractional abundances of CH₃OH.
Source	$N_{\rm DUSTY}^a$	$N_{\rm SCUBA}^b$	x(CH₃OH) $_{\rm DUSTY}^c$	x(CH₃OH) $_{\rm SCUBA}^c$	x(CH₃OH) $_{\rm out}^{c,d}$	x(CH₃OH) $_{\rm in}^{c,d}$
	(10²³ cm^-2)	(10²³ cm^-2)	$\times10^{-9}$	$\times$ 10^-9	$\times$ 10^-9	$\times$ 10^-8
SMM1	1.3	$3.5 \pm 0.3$	$3.6 \pm 0.9$	$1.3 \pm 0.4$	1	$\le$ 0.3
SMM3	0.83	$2.0 \pm 0.13$	2.8 $\pm$ 0.7	1.2 $\pm$ 0.3	4	$\le$ 50
SMM4	1.1	$1.2 \pm 0.07$	13 $\pm$ 3	12 $\pm$ 3	5	$\le$ 5
S68N	1.2	$1.7 \pm 0.10$	28 $\pm$ 2	21 $\pm$ 2	10	$\le$ 40

Notes. ^(a) Gas column density, N(H₂), obtained from D USTY modelling over a region of $22\hbox{$.\!\!^{\prime\prime}$ }5 \times 22\hbox{$.\!\!^{\prime\prime}$ }5$ assuming a gas:dust ratio of 100. ^(b) Gas column density, N(H₂),obtained from SCUBA emission at 850 $\mu$ m assuming a constant dust temperature of 20 K. ^(c) Fractional CH₃OH abundance summed over A- and E-type CH₃OH. ^(d) Inner and outer abundance in the R ATRAN jump-model.

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