A new broad K/Ka-band receiver (18.0–32.3 GHz) for the Yebes Observatory’s 40 meter radio telescope

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Volume 705 (January 2026)

A&A, 705 (2026) A17

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Table 9

Observed lines of HC₇NH⁺ in TMC-1.

Transition	ν_obs^a (MHz)	ν_obs − ν_cal^b (kHz)	$T_{A}^{}^{c}$ $\[T_{A}^{}{ }^{c}\]$ (mK)	σ^d (mK)
17–16	18833.854 ± 0.005	0.8	4.07	0.28
18–17	19941.722 ± 0.005	4.5	4.01	0.61
19–18	21049.584 ± 0.005	3.8	3.92	0.30
20–19	22157.444 ± 0.005	2.9	4.49	0.27
21–20	23265.299 ± 0.005	−1.3	4.47	0.29
22–21	24373.161 ± 0.005	3.4	4.45	0.24
23–22	25481.013 ± 0.005	0.0	5.43	0.30
24–23	26588.865 ± 0.005	−1.3	3.42	0.80
25–24	27696.709 ± 0.005	−8.4	5.33	0.84
26–25	28804.561 ± 0.005	−5.3	3.88	0.74
27–26	29912.403 ± 0.010	−9.8	3.36	0.86
28–27	31020.262 ± 0.010	5.1	3.51	0.89
29–28	32128.096 ± 0.005	−2.6
30–29	33235.947 ± 0.010	9.4
31–30	34343.775 ± 0.005	1.1
32–31	35451.607 ± 0.005	−0.5
33–32	36559.436 ± 0.005	−2.1
34–33	37667.266 ± 0.005	0.1
35–34	38775.092 ± 0.005	1.5
36–35	39882.917 ± 0.005	4.9
37–36	40990.729 ± 0.010	−1.4
38–37	42098.559 ± 0.010	13.6
39–38	43206.352 ± 0.010	−5.0
40–39	44314.154 ± 0.010	−11.1

Notes. ^(a)Observed frequency assuming a v_{LS R} of 5.83 km s⁻¹. ^(b)Observed minus calculated frequencies in kHz. ^(c)Antenna temperature in milli-Kelvin. ^(d)Root mean square noise of the data.

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