Table 5
Centimetre-wave lines of HDCCC and H2CCC in TMC-1.
| Molecule | Transition | Frequency | Ref. | E up | T A a | W | η MB | θ MB | V LSR a | Δv a | N b |
|
(GHz) | (cm-1) | (mK) | (K km s-1) | (%) | (″) | (km s-1) | (km s-1) | (109 cm-2) | ||
|
|
|||||||||||
| HDCCC | 101−000 | 19.384 | 1 | 0.647 | 13(3) | 0.006(2) | 0.880 | 37 | 5.62(3) | 0.28(6) | 118(36) |
| 10(6) | 6.02(2) | 0.14(11) | |||||||||
| H2CCC (para) | 101−000 | 20.792 | 2 | 0.694 | 158(19) | 0.054(18) | 0.867 | 36 | 5.71(7) | 0.28(4) | 769(231)c |
Notes. Pointing position for TMC-1: α2000 = 04h41m42.49s,δ2000 = + 25°41′26.9″. Estimated 1σ uncertainties (in parentheses) are in units of the least significant digits.
Derived from a least-squares fit of Gaussian profiles to the spectra in Fig. 3.
Calculated on the assumption that Tex = 4 K, the value derived for H2CCC in TMC-1 by Kawaguchi et al. (1991).
For para H2CCC. On the assumption that the ortho/para ratio is 3, N(ortho + para) = 3076(923) × 109 cm-2.
Reference. (1) This work; (2) Vrtilek et al. (1990).
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