Table 1.
Molecular constants and column densities derived in this work for the isotopologues of CH3C4H.
| Species | Bscal (MHz) | Bexp (MHz) | DJ (Hz) | DJK (kHz) | N (cm−2) | Notes |
|---|---|---|---|---|---|---|
| 13CH3CCCCH | 1982.6 | 1982.705397(639) | 75.09(340) | 17.919(229) | (1.4 ± 0.3) × 1011 | A |
| CH313CCCCH | 2025.3 | 2025.31357(109) | 78.63(542) | 19.485(455) | (1.4 ± 0.3) × 1011 | A |
| CH3C13CCCH | 2035.7 | 2035.6775188(845) | 86.5714(202) | 19.86182(194) | (1.4 ± 0.3) × 1011 | B |
| CH3CC13CCH | 2018.9 | 2018.98495(193) | 98.6(111) | 18.916(650) | (1.4 ± 0.3) × 1011 | A |
| CH3CCC13CH | 1980.3 | 1980.230832(808) | 84.81(413) | 18.002(328) | (1.4 ± 0.3) × 1011 | A |
| CH3CCCCD | 1929.8 | 1929.776034(436) | 67.94(178) | 18.3889(237) | (2.4 ± 0.2) × 1011 | C |
| CH3CCCCH | (1.30 ± 0.08) × 1013 | D | ||||
| CH2DCCCCH | (5.5 ± 0.5) × 1011 | E | ||||
Notes.
Fit to the lines observed with QUIJOTE (see Table A.1). The distortion constants HJ, HJK, HKJ, and LJJJK have been fixed to the values determined for CH3C4H: 4.354(56) × 10−6 Hz, 0.0364956(31) Hz, 0.3295(14) Hz, and −8.121(17) × 10−8 Hz, respectively.
Fit to the laboratory lines measured by Cazzoli et al. (2008). The distortion constants HJ = 5.58(137) × 10−6 Hz, HJK = 3.8203(535) Hz, HKJ = 0.3354(107) Hz, and LJJJK = −1.746(356) × 10−7 Hz were derived from this fit.
Fit to the laboratory Heath et al. (1955) and QUIJOTE lines. The distortion constants HJ, HJK, HKJ, and LJJJK have been fixed to the values determined for CH3C4H; see note A.
Column densities from Cernicharo et al. (2021c). Uncertainties have been increased by a factor of two to take an absolute calibration error of 10% into account.
Column densities from Cabezas et al. (2022). Uncertainties have been increased by a factor of two to take an absolute calibration error of 10% into account.
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