Table 1.
Observed line parameters of CH2CCH in TMC-1.
Transition (a) | νcalc(b) | Aul(c) | ![]() |
Δv(d) | VLSR | ![]() |
S/N(e) |
---|---|---|---|---|---|---|---|
(MHz) | (s−1) | (mK) | (km s−1) | (km s−1) | (mK km s−1) | (σ) | |
20, 2–10, 1J = 3/2–1/2 F1 = 2–1 F = 2–1 | 37457.521 | 3.72 × 10−9 | 0.96 ± 0.30 | 0.61 ± 0.26 | 5.57 ± 0.13 | 0.62 ± 0.24 | 4.8 |
20, 2–10, 1J = 5/2–3/2 F1 = 3–2 F = 4–3 | 37457.960 | 5.51 × 10−9 | 1.32 ± 0.30 | 0.66 ± 0.22 | 5.84 ± 0.09 | 0.93 ± 0.24 | 6.9 |
20, 2–10, 1J = 5/2–3/2 F1 = 2–1 F = 3–2 | 37458.377 | 5.45 × 10−9 | 0.75 ± 0.30 | 0.89 ± 0.43 | 5.80 ± 0.23 | 0.71 ± 0.34 | 4.6 |
20, 2–10, 1J = 5/2–3/2 F1 = 3–2 F = 3–2 | 37459.181 | 3.71 × 10−9 | 1.73 ± 0.30 | 0.64 ± 0.12 | 5.72 ± 0.06 | 1.17 ± 0.21 | 8.8 |
20, 2–10, 1J = 5/2–3/2 F1 = 2–1 F = 2–1 | 37461.052 | 5.45 × 10−9 | 1.39 ± 0.30 | 0.68 ± 0.15 | 5.68 ± 0.07 | 1.01 ± 0.20 | 7.3 |
20, 2–10, 1J = 3/2–1/2 F1 = 2–1 F = 3–2 | 37462.476 | 5.50 × 10−9 | 2.07 ± 0.30 | 0.86 ± 0.10 | 5.78 ± 0.05 | 1.90 ± 0.20 | 12.3 |
Notes. The line parameters peak, Δv, VLSR, and
as well as the associated errors were derived from a Gaussian fit to each line profile.
Quantum numbers from the coupling scheme of Tanaka et al. (1997).
The signal-to-noise ratio was computed for a spectral resolution equal to the linewidth, that is to say S/N = [S]/[N], where the signal is evaluated from the line area as /Δv], while the noise is evaluated as [N] = [rms ×
], where we used the inverse square-root dependence of noise on the spectral resolution, as given by the radiometer equation. In the expressions of [S] and [N], the rms is 0.30 mK, δν is the spectral resolution (0.03815 MHz), c is the speed of light in km s−1, and the rest of parameters are given in the table with the appropriate units.
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