Table 3.
Best fit parameters from our LTE modeling.
| E–CH3OH |
A–CH3OH |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Region | N(Sp) | Tex | FWHM | VLSR | N(Sp) | Tex | FWHM | VLSR | Mean VLSR | |
| [×1014 cm−3] | [K] | [km s−1] | [km s−1] | [×1014 cm−3] | [K] | [km s−1] | [km s−1] | [km s−1] | ||
| R1 | 3.7 |
14.8 |
59.7 |
305.4 |
0.76 |
18.8 |
61.3 |
302.9 |
304 ± 9 | |
| R2 | 5.0 |
9.3 |
43.6 |
328.1 |
1.0 |
14.8 |
37.4 |
327.2 |
328 ± 9 | |
| R3 | 19.5 |
21.4 |
53.8 |
283.2 |
9.3 |
26.6 |
55.0 |
284.7 |
283 ± 9 | |
| R4 | 10.16 |
31.0 |
60.2 |
252.0 |
9.0 |
34.2 |
60.1 |
251.5 |
252 ± 9 | |
| R5 | 6.2 |
32.2 |
136.0 |
217.2 |
3.2 |
32.2 |
136.0 |
217.2 |
217 ± 10 | |
| R6 | 22.32 |
24.8 |
65.3 |
179.9 |
14.1 |
31.0 |
66.0 |
182.1 |
181 ± 9 | |
| R7 | 17.4 |
19.5 |
82.8 |
169.3 |
5.5 |
22.9 |
83.2 |
173.6 |
171 ± 9 | |
| R8 | 5.9 |
14.8 |
63.7 |
204.2 |
1.2 |
19.5 |
59.1 |
205.2 |
205 ± 9 | |
| R9 | 5.6 |
13.9 |
57.4 |
202.7 |
1.5 |
19.2 |
56.3 |
201.4 |
202 ± 9 | |
| R10 | 1.0 |
12.3 |
24.9 |
143.9 |
0.27 |
27.36 |
22.8 |
146.4 |
145 ± 9 | |
Notes. From left to right columns are: selected region of the CMZ of NGC 253 (see Table 3), E-type methanol parameters: column density of the species (N(Sp)), excitation temperature (Tex), FWHM of the modeled methanol lines, and the local standard of rest velocity of the region VLSR. Columns (6)–(9) provide the same gas parameters for A–CH3OH. Uncertainties are 1σ. An extra uncertainty of 15% should be added to N(Sp) (due to the flux calibration accuracy, see Sect. 2). In the last column we present the average velocity of the two methanol symmetric types. In this case our 1σ uncertainty is summed in quadrature with our velocity resolution of ∼8–9 km s−1, which dominates.
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