Table 1
Observed line parameters of CH2CCH in TMC-1.
| Transition (a) | νcalc (b) | νobs (c) | Δv (d) |  peak |
 |
S∕N (e) |
|---|---|---|---|---|---|---|
| (MHz) | (MHz) | (km s−1) | (mK) | (mK km s−1) | (σ) | |
| 20,2–10,1 J = 3/2–1/2 F1 = 2–1 F = 2–1 | 37457.515 | 37457.542(20) | 0.55(35) | 0.60 | 0.35(22) | 4.5 |
| 20,2–10,1 J = 5/2–3/2 F1 = 3–2 F = 4–3 | 37457.965 | 37457.981(10) | 0.71(16) | 1.92 | 1.45(27) | 16.4 |
| 20,2–10,1 J = 5/2–3/2 F1 = 2–1 F = 3–2 | 37458.382 | 37458.390(13) | 0.80(27) | 1.28 | 1.09(29) | 11.6 |
| 20,2–10,1 J = 5/2–3/2 F1 = 3–2 F = 3–2 | 37459.186 | 37459.187(10) | 0.65(14) | 1.58 | 1.09(22) (f) | 12.9 |
| 20,2–10,1 J = 5/2–3/2 F1 = 2–1 F = 2–1 | 37461.057 | }37461.078(11) | 0.85(15) | 1.53 | 1.38(25) (g) | 14.3 |
| 20,2–10,1 J = 5/2-3/2 F1 = 2-1 F = 2–1 | 37461.111 | |||||
| 20,2–10,1 J = 3/2–1/2 F1 = 2–1 F = 3–2 | 37462.481 | 37462.489(10) | 0.76(17) | 1.63 | 1.31(25) | 14.3 |
| 50,5–40,4 J = 11/2–9/2 F1 = 6–5 F = 7–6 | 93642.970 | }93643.011(15) | 0.69(11) | 9.00 | 6.60(93) (g) | 22.3 |
| 50,5–40,4 J = 11/2–9/2 F1 = 5–4 F = 6–5 | 93643.059 | |||||
| 50,5–40,4 J = 11/2–9/2 F1 = 6–5 F = 6–5 | 93643.927 | 93643.940(22) | 0.65(18) | 6.25 | 4.32(97) | 15.1 |
| 50,5–40,4 J = 11/2–9/2 F1 = 6–5 F = 5–4 | 93644.560 | 93644.557(28) | 0.66(24) | 4.98 | 3.51(99) | 12.1 |
| 50,5–40,4 J = 11/2–9/2 F1 = 5–4 F = 5–4 | 93644.997 | 93644.982(22) | 0.65(16) | 6.19 | 4.30(92) | 15.0 |
| 50,5–40,4 J = 11/2–9/2 F1 = 5–4 F = 4–3 | 93645.319 | 93645.325(18) | 0.38(14) | 5.76 | 2.34(71) | 10.7 |
| 50,5–40,4 J = 9/2–7/2 F1 = 4–3 F = 4–3 | 93646.305 | 93646.286(48) | 0.61(30) | 3.68 | 2.40(114) | 8.6 |
| 50,5–40,4 J = 9/2–7/2 F1 = 4–3 F = 5–4 | 93646.815 | 93646.849(31) | 0.61(32) | 5.73 | 3.72(136) | 13.4 |
| 50,5–40,4 J = 9/2–7/2 F1 = 5–4 F = 5–4 | 93647.152 | 93647.155(25) | 0.35(17) | 5.13 | 1.89(87) | 9.0 |
| 50,5–40,4 J = 9/2–7/2 F1 = 5–4 F = 6–5 | 93647.925 | 93647.919(24) | 0.44(18) | 6.36 | 2.99(103) | 12.7 |
| 50,5–40,4 J = 9/2–7/2 F1 = 5–4 F = 4–3 | 93648.580 | }93648.648(41) | 0.62(45) | 4.65 | 3.07(145) (g) | 11.0 |
| 50,5–40,4 J = 9/2–7/2 F1 = 4–3 F = 3–2 | 93648.750 |
Notes. The line parameters νobs, Δv, 
peak, and 
as well as the associated errors were derived from a Gaussian fit to each line profile. (a)Quantum numbers from the coupling scheme of Tanaka et al. (1997). (b)Calculated frequencies, νcalc, from the combined laboratory and astronomical fit carried out in this work. (c)Observed frequencies adopting a systemic velocity of 5.83 km s−1 for TMC-1 (Cernicharo et al. 2020). (d)Δv is the full width at half maximum. (e) The signal-to-noise ratio is computed as S∕N = 
/ [rms 
], where c is the speed of light and δν is the spectral resolution. For the lines observed with the Yebes 40 m telescope at 37.5 GHz, δν = 0.03815 MHz and rms = 0.19 mK, while for the lines observed with the IRAM 30 m telescope at 93.6 GHz, δν = 0.04884 MHz and rms = 0.9 mK. The rest of the parameters are given in the table. (f)Line overlaps with the 21,2–11,1 transition of syn-C2H3OH, which lies at 37459.184 MHz (see Agúndez et al. 2021b). The observed intensity is thus the sum of the CH2CCH and the syn-C2H3OH lines. (g)Observed line results from a blend of two unresolved hyperfine components.
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