Table 1
Some observational and physical parameters for the five measured CS isotopologue transitions in the +50 km s−1 Cloud and the four transitions from the l.o.s. clouds towards Sgr B2(N), which are also located in the Galactic centre region.
| Target | Telescope | Isotopologue | Transition | ν0 (a) | Eup∕k (b) | Au,l (c) | HPBW (d) |
|---|---|---|---|---|---|---|---|
| (GHz) | (K) | (s−1) | (′′) | ||||
| +50 Cloud | IRAM 30 m | 13C34S | 2–1 | 90.9260260 | 6.55 | 1.19 × 10−5 | 27.0 |
| +50 Cloud | IRAM 30 m | 13CS | 2–1 | 92.4943080 | 6.66 | 1.41 × 10−5 | 26.6 |
| +50 Cloud | IRAM 30 m | C34S | 2–1 | 96.4129495 | 6.25 | 1.60 × 10−5 | 25.5 |
| +50 Cloud | IRAM 30 m | C33S | 2–1 | 97.1720639 | 7.00 | 1.63 × 10−5 | 25.3 |
| +50 Cloud | IRAM 30 m | CS | 2–1 | 97.9809533 | 7.05 | 1.67 × 10−5 | 25.1 |
| +50 Cloud | IRAM 30 m | C34S | 3–2 | 144.6171007 | 11.80 | 5.74 × 10−5 | 17.0 |
| +50 Cloud | IRAM 30 m | CS | 3–2 | 146.9690287 | 14.10 | 6.05 × 10−5 | 16.6 |
| +50 Cloud | APEX 12 m | 13CS | 6–5 | 277.4554050 | 46.60 | 4.40 × 10−4 | 22.1 |
| +50 Cloud | APEX 12 m | C34S | 6–5 | 289.2090684 | 38.19 | 4.81 × 10−4 | 21.2 |
| Sgr B2(N) | ALMA | 13C34S | 2–1 | 90.9260260 | 6.55 | 1.19 × 10−5 | 1.8 × 1.6 |
| Sgr B2(N) | ALMA | 13CS | 2–1 | 92.4943080 | 6.66 | 1.41 × 10−5 | 2.9 × 1.5 |
| Sgr B2(N) | ALMA | C34S | 2–1 | 96.4129549 | 6.25 | 1.60 × 10−5 | 1.9 × 1.4 |
| Sgr B2(N) | ALMA | CS | 2–1 | 97.9809533 | 7.05 | 1.67 × 10−5 | 1.8 × 1.3 |
Notes. The spectroscopic information for each molecule is taken from the Cologne Database for Molecular Spectroscopy (CDMS, Müller et al. 2005; Endres et al. 2016). (a) Rest frequency. (b) Upper energy level. (c) Einstein coefficient for spontaneousemission from upper u to lower l level. (d) Half-power beam width. For the IRAM sources it was calculated following Eq. (1) in http://www.iram.es/IRAMES/telescope/telescopeSummary/telescope_summary.html.
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