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

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Table 6

Column density and excitation temperature of ortho H₂CCC in TMC-1C.

Property	LTE	RADEX

N(cm^-2)	2.6 × 10¹¹ ^a	1.8 × 10¹¹
T_ex (K)	4^b	4.6^c
T_kinetic (K)	···	10.0

Notes.

^(a)

Average value of the column densities reported in Table 3 for ortho-H₂CCC in TMC-1C.

^(b)

T_ex assumed by analogy with Cernicharo et al. (1991) and Kawaguchi et al. (1991).

^(c)

Approximate mean of 4.4 K for the 5_1,5−4_1,4 transition and 4.8 K for the 4_1,4−3_1,3 transition at log n = 4.25 and log N = 11.25.

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