Discovery of the interstellar cyanoacetylene radical cation HC3N+

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Table 2.

Observed line parameters for HC₃N⁺.

J′−J	$F_{1}^{'} - F_{1}$ $F_1^\prime - F_1$	F′−F	ν_rest ^(a)	(o-c) ^(b)	$\int T_{A}^{} d v$ $\int T_{\rm A}^ {\rm d}v$ ^(c)	Δv ^(d)	$T_{A}^{}$ $T_{\rm A}^$ ^(e)	Notes
			(MHz)	(MHz)	(mK km s⁻¹)	(km s⁻¹)	(mK)
7/2–5/2	4–5	3–4	31621.877 ± 0.010	0.002	1.53 ± 0.08	1.07 ± 0.07	1.33 ± 0.10
7/2–5/2	3–4	2–3	31623.173 ± 0.010	–0.000	1.05 ± 0.07	0.90 ± 0.01	1.16 ± 0.10
7/2–5/2	4–4	3–3	31626.161 ± 0.010	0.001	1.07 ± 0.13	0.75 ± 0.08	1.34 ± 0.13	A
7/2–5/2	3–3	2–2	31627.170 ± 0.010	0.005	0.91 ± 0.13	0.99 ± 0.18	0.87 ± 0.10
7/2–5/2	4–3	3–2	31629.665 ± 0.010	0.000	0.92 ± 0.13	0.92 ± 0.18	0.94 ± 0.10	B
7/2–5/2	3–2	2–1	31630.840 ± 0.020	–0.006	0.88 ± 0.13	0.95 ± 0.23	0.61 ± 0.10
9/2–7/2	5–6	4–5						C
9/2–7/2	4–5	3–4	40659.446 ± 0.010	0.002	1.37 ± 0.08	0.97 ± 0.07	1.33 ± 0.09
9/2–7/2	5–5	4–4	40660.934 ± 0.010	0.001	1.44 ± 0.08	0.81 ± 0.05	1.67 ± 0.09
9/2–7/2	4–4	3–3	40661.701 ± 0.010	0.009	1.45 ± 0.09	0.98 ± 0.07	1.39 ± 0.09
9/2–7/2	5–4	4–3	40662.912 ± 0.010	–0.004	0.92 ± 0.07	0.72 ± 0.06	1.20 ± 0.09
9/2–7/2	4–3	3–2	40663.761 ± 0.010	–0.008	0.90 ± 0.09	1.10 ± 0.09	0.76 ± 0.09
11/2–9/2	6–7	5–6	49694.811 ± 0.050	–0.049	2.41 ± 0.24	1.51 ± 0.18	1.51 ± 0.25
11/2–9/2	5–6	4–5	49695.446 ± 0.050	0.037	1.00 ± 0.19	0.69 ± 0.17	1.38 ± 0.25
11/2–9/2	6–6	5–5	49696.225 ± 0.050	–0.020	1.21 ± 0.19	0.83 ± 0.14	1.43 ± 0.25
11/2–9/2	5–5	4–4	49696.847 ± 0.050	0.008	1.65 ± 0.21	0.85 ± 0.13	1.82 ± 0.25	B
11/2–9/2	6–5	5–4	49697.548 ± 0.050	0.026	0.98 ± 0.22	1.01 ± 0.30	0.91 ± 0.25
11/2–9/2	5–4	4–3						D

Notes.

^(a)

Rest frequency assuming a v_LSR of 5.83 km s⁻¹ (Cernicharo et al. 2020c).

^(b)

Observed frequency minus calculated frequency from the fit.

^(c)

Integrated intensity (in mK km s⁻¹).

^(d)

Line width (in km s⁻¹).

^(e)

Antenna temperature (in mK).

^(A)

Data only from the set of data with frequency switching throw of 8 MHz.

^(B)

Partially blended with a U feature.

^(C)

The line is fully blended with a strong line of CH₂CN.

^(D)

Affected by a negative feature produced in the folding of the frequency switching data.

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