Table 2
CN line parameters of NGC 253, obtained from Gaussian fits.
| Line |
|
ν | Δν1 /2 | T mb | |
| (K MHz) | (MHz) | (MHz) | (mK) | ||
|
|
|||||
| CN N = 1 → 0 | 21.637 ± 0.083 | 113 069.244 ± 0.166 | 88.721 ± 0.388 | 244 ± 1 | |
| 33.537 ± 0.061 | 113 393.540 ± 0.063 | 70.041 ± 0.170 | 479 ± 1 | ||
| 13CN N = 1 → 0 | 0.736 ± 0.086 | 108 555.278 ± 3.931 | 70.565 ± 9.396 | 10.4 ± 1.8 | |
| 0.632 ± 0.091 | 108 686.718 ± 4.555 | 61.822 ± 10.458 | 10.2 ± 2.3 | ||
| CH3OH 00 → 1-1 E | 1.569 ± 0.108 | 108 785.756 ± 1.333 | 56.561 ± 6.061 | 27.7 ± 3.5 | |
| CN N = 2 → 1 | 15.009 ± 0.160 | 226 138.445 ± 0.556 | 116.099 ± 1.369 | 129 ± 2 | |
| 29.210 ± 0.167 | 226 518.547 ± 0.324 | 115.337 ± 0.750 | 253 ± 2 | ||
| 47.099 ± 0.164 | 226 676.359 ± 0.174 | 105.801 ± 0.463 | 445 ± 2 | ||
Notes. Because of large bandwidths (4–8 GHz) that yield potentially complex velocity-frequency correlations, all fits were obtained on a frequency scale. All fitted CN components refer to groups of individual lines. Column 3 displays observed frequencies, referring to the local standard of rest (LSR) VLSR = 0 km s-1 frequency scale. All given errors are standard deviations obtained from Gaussian fits. The Tmb values (last column) were obtained from the values given in Cols. 2 and 4. Calibration uncertainties are not considered here but are discussed in Sect. 3.6.2.
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