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Home All issues Volume 522 (November 2010) A&A, 522 (2010) A62 Full HTML
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Table 1

Observed lines parameters, and derived column densities and 12C/13C ratios.

Source Isotopologue J−J′ ∫TMBdv v LSR Δv1/2a T MB a rms1σb N c 12C/13C
(K km s-1) (km s-1) (km s-1) (mK) (mK) ( × 1013 cm-2)
M 82 CCH 2−1 34.2 ± 0.6 307 97 119 7.6 55 ± 1 ...
C13CH 2−1  < 0.42d ... ... ... 2.3  < 0.7  > 78
13CCH 2−1  < 0.30d ... ... ... 1.7  < 0.5  > 110
13CCH+C13CH 2−1  < 0.25d ... ... ... 1.5  < 0.4  > 138
C18O 1−0 6.2 ± 0.1 293 106 55 1.9 620 ± 10 ...
13C18O 1−0  < 0.11 0.8  < 11  > 56
NGC 253 CCH 2−1 45.8 ± 0.6 216 171 90 8.4 73 ± 1 ...
C13CH 2−1  < 0.91d ... ... ... 4.5  < 1.6  > 46
13CCH 2−1  < 0.73d ... ... ... 3.3  < 1.3  > 56
13CCH+C13CH 2−1  < 0.51d ... ... ... 2.2  < 0.9  > 81
C18O 1−0 34.7 ± 0.2 270 183 178 3.7 3470 ± 20 ...
13C18O 1−0  ~0.58 ± 0.13e 270 183 3 1.5 58 ± 13  ≳ 60

Notes.

(a)

This value refers to the brightest component in the group.

(b)

1σ rms at the resolution shown in Fig. 1.

(c)

Beam averaged column density assuming a Tex = 10 K.

(d)

3σ limit to the integrated intensity

(e)

Tentative detection blended to an H2CS transition. Velocity and width parameters were fixed to fit both lines simultaneously.

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