Discovery of thiofulminic acid with the QUIJOTE line survey: A study of the isomers of HNCS and HNCO in TMC-1

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Volume 682 (February 2024)

A&A, 682 (2024) L4

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Table A.1.

Observed line parameters for the isomers and isotopologues of HNCS.

Species	J_u − J_l	F_u − F_l^a	ν_rest^b	^c	v_LSR	Δv^d	^e	Notes
			(MHz)	(mK km s⁻¹)	(km s⁻¹)	(km s⁻¹)	(mK)
HCNS	3-2		36908.475±0.010	0.95±0.06	5.83	1.04±0.09	0.85±0.07
	4-3		49211.115±0.010	0.77±0.11	5.83	0.47±0.08	1.56±0.14
	6-5		73815.835±0.020	1.34±0.39	5.83	0.38±0.10	3.40±0.90

HNCS	3₀₃ − 2₀₂	2-2	35186.557±0.010	0.19±0.06	5.83	0.63±0.10	0.29±0.07
		Main	35187.089±0.010	5.05±0.06	5.83	0.99±0.09	4.82±0.07
		3-3	35187.445±0.010	0.16±0.04	5.83	0.46±0.11	0.33±0.07
	4₀₄ − 3₀₃	3-3	46915.466±0.010	0.67±0.10	5.83	0.72±0.13	0.87±0.14	^A
		Main	46915.976±0.010	5.98±0.11	5.83	0.68±0.05	8.19±0.14
		4-4	46916.349±0.010	0.27±0.10	5.83	0.51±0.23	0.50±0.14	^A
	7₀₇ − 6₀₆	Main	82101.810±0.010	6.04±0.09	5.83	0.45±0.07	12.68±2.10
	8₀₈ − 7₀₇	Main	93830.036±0.010	3.29±0.16	5.83	0.53±0.04	5.83±0.60

HSCN	3₁₃ − 2₁₂	3-2	34227.919±0.020	0.14±0.06	5.83	0.62±0.12	0.21±0.09
	3₁₃ − 2₁₂	Main	34228.329±0.010	0.39±0.06	5.83	0.84±0.14	0.44±0.09
	3₀₃ − 2₀₂	3-3	34407.322±0.010	1.62±0.09	5.83	0.77±0.04	1.98±0.11
	3₀₃ − 2₀₂	2-1	34408.425±0.010	7.74±0.08	5.83	0.72±0.01	10.26±0.11
	3₀₃ − 2₀₂	Main	34408.660±0.010	28.58±0.09	5.83	0.90±0.01	29.82±0.11
	3₀₃ − 2₀₂	2-2	34410.448±0.010	1.38±0.09	5.83	0.67±0.04	1.93±0.11
	3₁₂ − 2₁₁	3-2	34587.252±0.010	0.27±0.05	5.83	1.02±0.21	0.24±0.06
	3₁₂ − 2₁₁	Main	34587.606±0.010	0.35±0.05	5.83	1.53±0.32	0.21±0.06	^B
	4₁₄ − 3₁₃	4-3	45637.236±0.010	0.28±0.07	5.83	0.45±0.14	0.57±0.14
	4₁₄ − 3₁₃	Main	45637.423±0.010	0.51±0.09	5.83	0.81±0.18	0.59±0.14
	4₀₄ − 3₀₃	4-4	45876.458±0.010	0.80±0.07	5.83	0.61±0.05	1.24±0.14
	4₀₄ − 3₀₃	3-2	45877.725±0.010	10.52±0.34	5.83	0.68±0.02	14.57±0.14
	4₀₄ − 3₀₃	Main	45877.828±0.010	27.29±0.34	5.83	0.65±0.01	39.75±0.14
	4₀₄ − 3₀₃	3-3	45878.621±0.010	0.39±0.08	5.83	0.88±0.08	0.41±0.14
	4₁₃ − 3₁₂	4-3	46116.344±0.020	0.18±0.04	5.83	0.60±0.00	0.30±0.13	^C
	4₁₃ − 3₁₂	3-2	46116.396±0.020	0.28±0.07	5.83	0.60±0.00	0.31±0.13	^C
	4₁₃ − 3₁₂	5-4	46116.492±0.020	0.36±0.07	5.83	0.60±0.00	0.60±0.13	^C
	7₀₇ − 6₀₆	Main	80283.160±0.010	19.98±0.44	5.83	0.61±0.02	28.89±0.64
	8₀₈ − 7₀₇	Main	80283.160±0.010	10.54±0.77	5.83	0.60±0.05	16.63±1.66

DSCN	3₁₃ − 2₁₂	Main	33258.268±0.010	0.24±0.07	5.83	0.72±0.21	0.32±0.09
	3₀₃ − 2₀₂	Main	33581.957±0.010	0.33±0.04	5.83	0.87±0.11	0.35±0.06	^D
	3₁₂ − 2₁₁	Main	33905.771±0.003				≤0.3
	4₁₄ − 3₁₃	Main	44343.744±0.010	0.36±0.12	5.83	0.66±0.26	0.52±0.10
	4₀₄ − 3₀₃	Main	44774.598±0.010	0.84±0.13	5.83	0.78±0.14	1.01±0.13
	4₁₃ − 3₁₂	Main	45207.143±0.010	0.29±0.07	5.83	0.46±0.14	0.60±0.11

H³⁴SCN	3₀₃ − 2₀₂	2-1	33642.089±0.020	0.39±0.07	5.83	0.91±0.17	0.40±0.07
	3₀₃ − 2₀₂	Main	33642.328±0.010	0.98±0.07	5.83	0.96±0.09	0.96±0.07
	4₀₄ − 3₀₃	Main	44856.085±0.020	0.64±0.05	5.83	0.57±0.06	1.06±0.11

NCS	5/2-3/2 ef	9/2-7/2	42699.184±0.010	2.25±0.07	5.83	0.67±0.02	3.14±0.10
	5/2-3/2 ef	7/2-4/2	42702.930±0.010	2.10±0.08	5.83	0.82±0.04	2.39±0.10
	5/2-3/2 ef	5/2-3/2	43705.851±0.010	1.61±0.08	5.83	0.81±0.05	1.88±0.10

Notes.

^(a)

Main refers to the three hyperfine components with the strongest line intensities, F_u − F_l=J + 1→J, J→J − 1, and J − 1→J − 2, respectively. These are unresolved but could produce a measurable line broadening. However, the model to compute the synthetic spectrum of all CHNS isomers and isotopologues takes into account all hyperfine components.

^(b)

Observed frequencies for the transitions of the species studied in this work assuming a v_LSR of 5.83 km s⁻¹ (see text). For lines for which only upper limits to the intensity are obtained the predicted frequencies from the laboratory data are given.

^(c)

Integrated line intensity in mK km s⁻¹.

^(d)

Line width at half intensity using a Gaussian fit in the line profile (in km s⁻¹).

^(e)

Antenna temperature (in mK). Upper limits correspond to 3σ values.

^(A)

These hyperfine components appear too strong compared with the other transition of the same molecule. They are probably blended with unknown lines as shown in Fig. 1.

^(B)

Heavily blended line. Derived parameters are uncertain (see Fig. A.2).

^(C)

The hyperfine components are blended but produce a well-defined line profile. The line width has been fixed to 0.6 km s⁻¹ (see Fig. A.2).

^(D)

The main component is affected by a line of HC₄N at +8 MHz in the frequency switching data with a throw of 8 MHz, and by a line of c-C₃HCCH at -10 MHz in the data with a throw of 10 MHz. The corresponding line parameters are uncertain (see Fig. A.3).

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