A study of the C3H2 isomers and isotopologues: first interstellar detection of HDCCC

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Table 4

Observed line parameters of HDCCC in TMC-1C and L1544.

Transition	Frequency	Ref.	E _up	T _mb	rms	W	B _eff	θ _MB	V _LSR ^a	Δv ^a	N ^b
–	(GHz)		(cm^-1)	(mK)	(mK)	(K km s^-1)	(%)	(′′)	(km s^-1)	(km s^-1)	(× 10⁹ cm^-2)

TMC- 1C ^c
5₀₅ – 4₀₄	96.902	1	9.70	17(4)	3	0.005(1)	80	27	6.09(2)	0.26(4)	64(7)
7₀₇ – 6₀₆	135.634	1	18.10	≤3	3	···	76	18	···	···	···
L1544^d
5₀₅ – 4₀₄	96.902	1	9.70	12(4)	3	0.005(1)	80	27	7.31(5)	0.41(1)	71(7)

Notes.

^(a)

Derived from a least-squares fit of Gaussian profiles to the spectra in Figs. 1 and 2.

^(b)

Calculated on the assumption that T_ex is 4 K.

^(c)

Pointing position: α₂₀₀₀ = 04^h41^m161, δ₂₀₀₀ = +25°49′438.

^(d)

Pointing position: α₂₀₀₀ = 05^h04^m1721, δ₂₀₀₀ = +25°10′42.

Reference. (1) This work.

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