Increased complexity in interstellar chemistry: detection and chemical modeling of ethyl formate and n-propyl cyanide in Sagittarius B2(N)

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Volume 499 / No 1 (May III 2009)

A&A, 499 1 (2009) 215-232

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Table 13:

Parameters of our best-fit LTE models of methyl cyanide, ethyl cyanide, vinyl cyanide, and aminoacetonitrile, and column density upper limit for cyanomethylidyne.
Molecule^a	Size^b	$T_{\rm rot}$ ^c	N^d	$\Delta V^{e}$	$V_{{\rm off}}$ ^f
	('')	(K)	(cm^-2)	(km s^-1)	(km s^-1)
(1)	(2)	(3)	(4)	(5)	(6)
CH₃CN	2.7	200	$2.00 \times 10^{18}$	6.5	-1.0
	2.7	200	$8.00 \times 10^{17}$	6.5	9.0
	2.7	200	$1.00 \times 10^{17}$	8.0	-11.0
C₂H₅CN	3.0	170	$1.20 \times 10^{18}$	6.5	-1.0
	2.3	170	$1.40 \times 10^{18}$	6.5	9.0
	1.7	170	$9.00 \times 10^{17}$	8.0	-11.0
C₂H₃CN	2.3	170	$8.00 \times 10^{17}$	7.0	-1.0
	2.3	170	$2.40 \times 10^{17}$	7.0	9.0
	2.3	170	$1.00 \times 10^{17}$	10.0	-9.0
NH₂CH₂CN	2.0	100	$2.80 \times 10^{16}$	7.0	0.0
CCN^g	3.0	200	< $1.20 \times 10^{17}$	6.5	-1.0
	3.0	200	< $1.20 \times 10^{17}$	6.5	9.0

Notes: ^a We used the JPL entry for CH₃CN (version 3), and the CDMS entries for C₂H₅CN (ver. 1), C₂H₃CN (ver. 1), NH₂CH₂CN (ver. 1), and CCN (ver. 1). See references to the laboratory data therein. ^b Source diameter (FWHM). ^c Temperature. ^d Column density. ^e Linewidth (FWHM). ^f Velocity offset with respect to the systemic velocity of Sgr B2(N) $V_{{\rm lsr}} = 64$ km s^-1. ^g The column density upper limit is $\sim$ $3\sigma$ . The other parameters were fixed.

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