Space and laboratory discovery of iminopentadienylidene, HNC5

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Table 1.

Observed line parameters of HNC₅ and HC₄NC.

Transition ^(a)	ν_rest^(b)	O−C ^(c)	$\int T_{A}^{} d v$ $\int T_{\rm A}^ dv$ ^(d)	Δv^(e)	$T_{A}^{}$ $T_{\mathrm{A}}^{}$ ^(f)
	(MHz)	(kHz)	(mK km s⁻¹)	(km s⁻¹)	(mK)
HNC₅
5–4 ^(g)	13 617.484 ± 0.002	0.4	...	...	...
6–5 ^(g)	16 340.973 ± 0.002	−1.7	...	...	...
7–6 ^(g)	19 064.462 ± 0.002	1.5	...	...	...
12–11	32 681.784 ± 0.010	−4.7	1.21 ± 0.07	0.70 ± 0.04	1.63 ± 0.10
13–12	35 405.222 ± 0.010	−6.3	1.11 ± 0.13	0.75 ± 0.10	1.38 ± 0.11
14–13	38 128.657 ± 0.010	−0.6	1.27 ± 0.09	0.91 ± 0.08	1.31 ± 0.10
15–14	40 852.084 ± 0.010	8.0	0.68 ± 0.08	0.58 ± 0.08	1.11 ± 0.12
16–15	43 575.481 ± 0.010	−1.5	0.81 ± 0.15	0.73 ± 0.19	1.05 ± 0.17
17–16	46 298.876 ± 0.018	−0.4	0.14 ± 0.08	0.34 ± 0.15	0.40 ± 0.16

HC₄NC
12–11	33 628.146 ± 0.010	0.4	3.16 ± 0.12	0.74 ± 0.03	4.03 ± 0.12
13–12	36 430.451 ± 0.010	2.5	2.58 ± 0.06	0.64 ± 0.02	3.77 ± 0.08
14–13	39 232.738 ± 0.010	−3.2	2.49 ± 0.13	0.59 ± 0.03	3.96 ± 0.14
15–14	42 035.028 ± 0.010	5.1	1.79 ± 0.09	0.56 ± 0.03	2.99 ± 0.10
16–15	44 837.284 ± 0.010	−8.8	1.87 ± 0.09	0.56 ± 0.03	3.11 ± 0.13
17–16	47 639.557 ± 0.010	6.8	1.76 ± 0.17	0.75 ± 0.09	2.21 ± 0.15

Notes.

^(a)

Quantum numbers are J′−J″, where J′ denotes the upper and J″ the lower level.

^(b)

Frequency of the observed transitions in TMC-1 assuming a local standard of rest velocity (v_LSR) of 5.83 km s⁻¹ (Cernicharo et al. 2020).

^(c)

Observed minus calculated frequencies in kHz. The calculated frequencies were obtained from a merged fit to the TMC-1 and the laboratory data (see Table 2).

^(d)

Integrated line intensity in mK km s⁻¹.

^(e)

Line width at half-intensity derived by fitting a Gaussian function to the observed line profile in km s⁻¹.

^(f)

Antenna temperature in milli Kelvin.

^(g)

For the laboratory transitions J′−J″ = 5−4, 6−5, and 7−6, the observed frequencies correspond to the F′−F″ hyperfine components 6−5, 7−6, and 8−7, respectively.

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