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Table 1

Column densities, rotational temperatures, and fractional abundances of all the observed molecules in the NE lobe of M 82.

Moleculea Nmol (cm-2) Trotb (K) Nmol/NC34S

C2H (1.3 ± 0.6) × 1015 20.0 ± 10.0 118.2 ± 60.7
NO (1.2 ± 0.1) × 1015 8.8 ± 4.4 109.1 ± 10.7
CH3CCHc (1.2 ± 0.1) × 1015 31.6 ± 0.1 109.1 ± 10.7
CS (1)c (2.0 ± 0.1) × 1014 5.9 ± 0.1 22.0 ± 1.7
CS (2)c (4.2 ± 0.1) × 1013 14.7 ± 0.8 ...
CH3OH (1.2 ± 1.1) × 1014 26.2 ± 11.7 10.9 ± 11.7
H2CO (1.1 ± 0.2) × 1014 25.5 ± 3.0 10.0 ± 2.7
H2 S (6.1 ± 4.5) × 1013 20.0 ± 10.0 5.5 ± 5.2
c-C3H2 (4.8 ± 1.3) × 1013 10.1 ± 1.2 4.4 ± 2.0
HCO (3.9 ± 2.8) × 1013 20.0 ± 10.0 3.5 ± 3.5
SO (3.7 ± 0.5) × 1013 20.0 ± 10.0 3.4 ± 1.2
H2CS (3.1 ± 2.5) × 1013 20.0 ± 10.0 2.8 ± 3.2
HC3Nc (2.5 ± 1.2) × 1013 24.2 ± 3.9 2.3 ± 1.9
SO2 (1.2 ± 0.6) × 1013 20.0 ± 10.0 1.1 ± 1.3
NH2 CN (1.2 ± 1.5) × 1013 80.3 ± 52.9 1.1 ± 2.2
C34S (1.1 ± 0.7) × 1013 20.0 ± 10.0 1.0 ± 1.0
CH3 CN (6.4 ± 1.2) × 1012 32.9 ± 1.6 0.6 ± 0.8
H13 CN (1.7 ± 1.6) × 1012 20.0 ± 10.0 0.2 ± 0.9
H13CO+ (1.3 ± 0.8) × 1012 20.0 ± 10.0 0.1 ± 0.8

C18Od (3.5 ± 1.7) × 1016 20.0 ± 10.0 3181.8 ± 1700.7
CNe (2.0 ± 0.5) × 1014 ... 18.2 ± 5.7
HCNe (4.0 ± 0.5) × 1013 ... 3.6 ± 1.2
HNCf 2.2 × 1013 10.0 2.0
CO+g (6.6 ± 3.4) × 1012 20.0 ± 10.0 0.6 ± 1.0
HOC+h (3.9 ± 1.9) × 1012 20.0 ± 10.0 0.4 ± 0.9

Notes. 

(a)

Molecules in boldface are new detections in M 82.

(b)

Some molecules do not have a wide enough dynamic range in energy to calculate the rotational temperature with precision. For them, we assumed Trot = 20 ± 10 K (see Sect. 3.4 and Appendix A for details).

(c)

Some extra detections observed by Aladro et al. (2011) were used. CS shows two components with different column densities and rotational values corresponding to the two fits that result from its Boltzmann diagram. The fractional abundance value is in this case  [NCS(1) + NCS(2)] /NC34S. The molecules shown at the bottom of the table were observed by:

(e)

Fuente et al. (2005) (averaged value for the galaxy disk);

(f)

Hüttemeister et al. (1995) (averaged value for the nuclear zone);

(h)

Aladro et al. (in prep.).

(†)

Only upper limits were reported until now: SO, and SO2 by Petuchowski & Bennett (1992), and H13CN by Wild et al. (1990).

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