Table 5
Parameters of the models for the three selected positions in the vicinity of Sgr A*.
| Position | D (b,c) | D/G | Source | log  |
Tk (c,d) | O/P (c) | 16O/18O |  |
V t (e) | Td (e) | log τd (f) | log  |
log  |
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Com. (a) | (kpc) | Ratio (c) (%) | Radius (d) (pc) | (cm−3) | (K) | Ratio (c) | (×10−6) | (km s−1) | (K) | (cm−2) | (cm−2) | |||
| CND1 | 1 | 7.9 | 1 | 0.31 | 4.5 | 200 | 3 | 250 | 9.3 |
23 ± 3 | 45 |
−2.1 |
22.48 |
17.45 |
| 2 | 7.9 | 1 | 0.08 | 5.2 | 500 | 3 | 250 | 6.7 |
23 ± 3 | 30 |
−2.0 |
22.59 |
17.42 |
|
| CND2 | 1 | 7.9 | 1 | 0.32 | 4.5 | 175 | 3 | 250 | 1.3 |
14 ± 3 | 15 |
−2.1 |
22.50 |
16.62 |
| 2 | 7.9 | 1 | 0.06 | 5.3 | 325 | 3 | 250 | 13.3 |
14 ± 3 | 25 |
−2.0 |
22.56 |
17.69 |
|
| 20 km s−1 cloud | 1 | 7.9 | 1 | 2.3 | 4.6 | 100 | 3 | 250 | 0.04 |
9 ± 2 | 26 (i) | −1.1 |
23.44 |
16.04 |
Notes. (a) Component. (b) Distance to source. (c)Fixed parameter. (d)These values are taken from Requena-Torres et al. (2012) for the two CND positions. The
and Tk are taken from Amo-Baladrón et al. (2011) and Hüttemeiser et al. (1993), respectively, for the 20 km s−1 cloud, while the radius of this source is estimated from our H2O maps (see Appendix B.2). (e)Free parameter. (f)Predicted value at 250 μm. The uncertainty in the τd is calculated assuming a 10% uncertainty in the source size. (g)Estimated
assuming a mass-absorption coefficient of 8.2 cm2 g−1 at 250 μm (González-Alfonso et al. 2014) and a D/G of 1%. 
derived using the 
and 
given in this table. (i)The Td used for the 20 km s−1 position is fixed as no observational continuum was available to constrain the Td of this position.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.