Sulphur and carbon isotopes towards Galactic centre clouds

P. K. Humire; V. Thiel; C. Henkel; A. Belloche; J.-C. Loison; T. Pillai; D. Riquelme; V. Wakelam; N. Langer; A. Hernández-Gómez; R. Mauersberger; K. M. Menten

doi:10.1051/0004-6361/202038216

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Volume 642 (October 2020)

A&A, 642 (2020) A222

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Table 2

Line parameters for the nine measured CS isotopologue transitions in the +50 km s⁻¹ Cloud.

Isotopologue	Transition	∫ T_mbdV	Peak velocity	FWHM	T	τ ^(a)
		(K km s⁻¹)	(km s⁻¹)	(km s⁻¹)	(K)
¹³C³⁴S^(b)	2–1	1.25 ± 0.12	48.44 ± 0.92	20.99 ± 2.24	0.06 ± 0.005	–
¹³CS	2–1	23.28 ± 0.28	46.94 ± 0.12	22.28 ± 0.29	0.98 ± 0.01	0.08
C³⁴S	2–1	32.61 ± 0.41	46.45 ± 0.13	23.07 ± 0.32	1.33 ± 0.02	–
C³³S	2–1	7.73 ± 0.31	47.05 ± 0.45	27.61 ± 1.14	0.26 ± 0.01	–
CS⁽⁺⁾	2–1	250.00 ± 6.66	48.10 ± 0.11	27.56 ± 0.51	8.52 ± 0.16	1.9
CS⁽⁻⁾	2–1	–37.62 ± 6.13	48.09 ± 0.19	10.85 ± 0.82	–3.26 ± 0.32	–
C³⁴S	3–2	21.19 ± 0.19	45.95 ± 0.09	22.39 ± 0.22	0.89 ± 0.01	0.05–0.15
CS⁽⁺⁾	3–2	250.00 ± 14.22	47.87 ± 0.10	25.59 ± 0.61	9.18 ± 0.73	1.0–2.8
CS⁽⁻⁾	3–2	–78.71 ± 14.69	48.45 ± 0.12	13.97 ± 0.77	–5.29 ± 0.71	–
¹³CS	6–5	2.39 ± 0.12	43.94 ± 0.43	18.61 ± 1.04	0.120 ± 0.005	–
C³⁴S	6–5	3.32 ± 0.10	44.42 ± 0.26	18.51 ± 0.62	0.169 ± 0.005	–

Notes. ^(a) Peak opacity. ^(b)A CH₃ OCH₃ (see Sect. 4.1 and Fig. 2) contribution was subtracted before performing a single Gaussian fit to this line. ⁽⁺⁾ Positive component (in blue in Fig. 2). ⁽⁻⁾Negative component (in green in Fig. 2).

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