Table 1.
Derived rotational constants and column densities for the isotopologs of HCCNC and HNCCC.
| Species | B (MHz) | D (kHz) | eQq (MHz) | Jmax | σ (kHz) | N (cm−2) | Notes |
|---|---|---|---|---|---|---|---|
| HCCNC | 4967.83827(12) | 0.62694(14) | 0.94628(81) | 33 | 20.0 | (3.4 ± 0.10)×1012 | (A) |
| H13CCNC | 4813.11872(66) | 0.559(41) | 0.9429(39) | 5 | 6.2 | (3.7 ± 0.15)×1010 | (B) |
| HC13CNC | 4949.44614(22) | 0.605(14) | 0.9457(13) | 5 | 0.7 | (3.7 ± 0.15)×1010 | (B) |
| HCCN13C | 4804.87363(22) | 0.555(13) | 0.9447(12) | 5 | 4.1 | (3.4 ± 0.15)×1010 | (B) |
| HCC15NC | 4944.73993(78) | 0.516(33) | 5 | 14.9 | (1.4 ± 0.15)×1010 | (B) | |
| DCCNC | 4598.28896(03) | 0.518(0) | 51 | 3.3 | (1.1 ± 0.15)×1011 | (C) | |
| HNCCC | 4668.33752(25) | 0.62165(72) | 1.0995(48) | 31 | 19.9 | (5.8 ± 0.15)×1011 | (D) |
| HN13CCC | 4655.7452(50) | 0.61 | 5 | 1.0 | (6.2 ± 0.20)×1009 | (E) | |
| HNC13CC | 4643.5839(50) | 0.61 | 5 | 1.0 | (6.2 ± 0.20)×1009 | (E) | |
| HNCC13C | 4500.9332(50) | 0.57 | 5 | 14.0 | (6.6 ± 0.20)×1009 | (E) | |
| DNCCC | 4400.5916(50) | 0.52 | 1.169(19) | 5 | 22.3 | (1.1 ± 0.20)×1010 | (F) |
Notes.
Fit to the laboratory lines measured by Guarnieri et al. (1992) and Krüger et al. (1992), and to the hyperfine components of the J = 4 − 3 and 5–4 lines observed with QUIJOTE (see Table A.1).
Fit to the laboratory J = 1 − 0 hyperfine components measured by Krüger et al. (1992) and to the main component of the J = 4 − 3 and 5–4 lines observed with QUIJOTE (see Table A.1).
Fit to the laboratory lines measured by Huckauf et al. (1998).
Fit to the laboratory lines measured by Kawaguchi et al. (1992b), Hirahara et al. (1993) and Vastel et al. (2018). The hyperfine components of the J = 4 − 3 and 5–4 lines measured with QUIJOTE have been included in the fit. We have also added the frequencies of the J = 8 − 7, 9–8 and 10–9 lines measured with the IRAM 30 m radio telescope (see Table A.1). The distortion constant H has been derived to be (1.57 ± 0.48)×10−9 MHz. Its inclusion in the fit reduces the standard deviation from 23.3 kHz to 19.9 kHz.
Fit to the two lines measured toward TMC-1. The distortion constant has been fixed for each isotopolog (see Sect. 3.2) and the uncertainty on B has been assumed to be 5 kHz.
Fit to the J = 1 − 0 and 2–1 lines measured by Hirahara et al. (1993) and to the J = 4 − 3 and 5–4 lines observed toward TMC-1 in this work.
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