Table 4
Isotopic ratios determined in the envelope of Sgr B2(N) (13CS/13C34S and C34S/13C34S) and in GC clouds along the line of sight to Sgr B2(N) (CS/C34S) using absorption lines of CS isotopologues.
| Isotopic ratios determined in the envelope of Sgr B2(N) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Δx (a) | Δy (a) | VLSR | N(C34S)(b) | N(13CS)(b) | N(13C34S)(b) | FWHM(c) | 13CS/13C34S | C34S/13C34S |
| (′′) | (′′) | (km s−1) | (1012 cm−2) | (1012 cm−2) | (1012 cm−2) | (km s−1) | ||
| 1.8 | 11.1 | 71.6 | 70.0 ± 1.1 | 35.0 ± 1.2 | 2.5 ± 0.6 | 4.0 | 14.0 ± 3.3 | 28.0 ± 6.6 |
| 1.8 | 11.1 | 65.8 | 120.0 ± 1.6 | 90.0 ± 2.2 | 3.5 ± 0.7 | 5.0 | 25.7 ± 5.3 | 34.3 ± 7.1 |
| 1.8 | 11.1 | 61.1 | 65.0 ± 1.1 | 38.0 ± 1.4 | 2.6 ± 0.7 | 5.0 | 14.6 ± 4.1 | 25.0 ± 7.0 |
| 9.3 | 1.8 | 71.1 | 39.0 ± 0.9 | 30.0 ± 0.9 | 1.2 ± 0.4 | 4.0 | 25.0 ± 8.8 | 32.5 ± 11.4 |
| 9.3 | 1.8 | 63.8 | 200.0 ± 2.3 | 160.0 ± 2.1 | 8.2 ± 0.8 | 7.5 | 19.5 ± 2.0 | 24.4 ± 2.4 |
| 4.8 | 9.3 | 80.6 | 94.0 ± 3.1 | 74.0 ± 3.7 | 7.0 ± 1.9 | 9.0 | 10.6 ± 3.0 | 13.4 ± 3.7 |
| 4.8 | 9.3 | 61.3 | 280.0 ± 6.5 | 120.0 ± 4.7 | 8.0 ± 2.0 | 9.5 | 15.0 ± 3.8 | 35.0 ± 8.8 |
| 6.6 | 3.3 | 64.2 | 420.0 ± 4.5 | 280.0 ± 4.3 | 15.0 ± 1.5 | 12.5 | 18.7 ± 1.8 | 28.0 ± 2.7 |
| average | 17.9 ± 5.0 | 27.6 ± 6.5 | ||||||
| Isotopic ratios determined in GC clouds along the line of sight to Sgr B2(N) | ||||||||
| Δx (a) | Δy (a) | VLSR | N(CS)(b) | N(C34S)(b) | FWHM(c) | CS/C34S | ||
| (′′) | (′′) | (km s−1) | (1012 cm−2) | (1012 cm−2) | (km s−1) | |||
| 1.8 | 11.1 | −73.3 | 26.0 ± 0.7 | 1.4 ± 0.5 | 3.5 | 18.6 ± 6.3 | ||
| 1.8 | 11.1 | −81.2 | 45.0 ± 0.9 | 2.5 ± 0.6 | 5.0 | 18.0 ± 4.0 | ||
| 1.8 | 11.1 | −104.2 | 58.0 ± 1.0 | 3.0 ± 0.6 | 5.0 | 19.3 ± 3.6 | ||
| 9.3 | 1.8 | −82.5 | 16.0 ± 0.7 | 1.4 ± 0.4 | 2.5 | 11.4 ± 3.7 | ||
| 9.3 | 1.8 | −92.6 | 20.0 ± 0.7 | 1.2 ± 0.5 | 2.5 | 16.7 ± 7.3 | ||
| 9.3 | 1.8 | −104.7 | 63.0 ± 1.1 | 3.0 ± 0.7 | 6.5 | 21.0 ± 4.9 | ||
| 6.6 | 3.3 | −71.8 | 65.0 ± 1.5 | 7.2 ± 0.8 | 5.5 | 9.0 ± 1.0 | ||
| 6.6 | 3.3 | −79.8 | 29.0 ± 1.0 | 1.8 ± 0.6 | 4.0 | 16.1 ± 5.8 | ||
| Average | 16.3 ± 3.8 | |||||||
Notes. (a) The offset positions (Δx, Δy) in units of arcseconds: (1.8, 11.1), (9.3, 1.8), (4.8,9.3), and (6.6, 3.3), correspond to K4, K6shell, K5shell, and K6shell,a, in Fig. 1, respectively. See the caption to Fig. 1 and the green crosses in the image. (b) Column densities determined using Weeds. (c)It is assumed that all isotopologues have the same FWHM. The average isotope ratios presented by the lowest line of each panel are unweighted and provide the standard deviation of an individual measurement (without dividing by the square root of the number of ratios).
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