The quest for complex molecules in space: laboratory spectroscopy of n-butyl cyanide, n-C4H9CN, in the millimeter wave region and its astronomical search in Sagittarius B2(N)

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Volume 541 (May 2012)

A&A, 541 (2012) A121

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Table 2

Parameters of our best-fit LTE models of alkyl cyanides with upper limits for n-butyl cyanide, which was not unambiguously detected.

Molecule^a	Size^b	T _rot ^c	N ^d	ΔV^e	V _off ^f
	(′′)	(K)	(cm^-2)	(km s^-1)	(km s^-1)
(1)	(2)	(3)	(4)	(5)	(6)

CH₃CN	2.7	200	2.0 × 10¹⁸	6.5	−1.0
	2.7	200	8.0 × 10¹⁷	6.5	9.0
	2.7	200	1.0 × 10¹⁷	8.0	−11.0
C₂H₅CN	3.0	170	1.2 × 10¹⁸	6.5	−1.0
	2.3	170	1.4 × 10¹⁸	6.5	9.0
	1.7	170	9.0 × 10¹⁷	8.0	−11.0
n-C₃H₇CN	3.0	150	1.5 × 10¹⁶	7.0	−1.0
	3.0	150	6.6 × 10¹⁵	7.0	9.0
AA-n-C₄H₉CN	3.0	150	≤3.0 × 10¹⁵	7.0	−1.0
GA-n-C₄H₉CN	3.0	150	≤8.0 × 10¹⁵	7.0	−1.0

Notes.

^(a)

Results for CH₃CN, C₂H₅CN, and n-C₃H₇CN were taken from Belloche et al. (2009).

^(b)

Source diameter (FWHM).

^(c)

Temperature.

^(d)

Column density or upper limit.

^(e)

Linewidth (FWHM).

^(f)

Velocity offset with respect to the systemic velocity of Sgr B2(N), V_lsr = 64 km s^-1.

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