First detection of the carbon chain molecules 13CCC and C13CC towards SgrB2(M)

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Table 4

Total column densities and partition functions of CCC, C¹³CC and ¹³CCC transitions.

	T_ex (K)	log (N₀)	Q_rv	N × 10¹⁴	rel.
				cm⁻²
CCC	44.4	13.92(04)	46.64		100%

C¹³CC	44.4 ^(a)	12.64(16) ^(b)	47.66	^(b)	5 ± 2%

¹³CCC	44.4 ^(a)	12.40(18) ^(b)	97.30	^(b)	6 ± 3%

Notes. ^(a) T_ex is fixed to the value derived for CCC. ^(b) Uncertainties are given as mean absolute deviation (MAD) of the two measured Q(2) and Q(4) column densities from their mean value.

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