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Table 3

Lines covered as part of CLAWS with measurements re-gridded onto the same hexagonal grid and convolved to a common working resolution: 15,27, or 34 arcsec.

35’’/1.4 kpc aperture (a) 60’’/2.4 kpc aperture (a)


Band Line Resolution Tpeak <rms> Wline S/Nline Wline/W12CO(2–1) Wline S/Nline Wline/W12CO(2-1)
(″) (mK) (mK) (K km s–1) (K km s–1)
(1) (2) (3) (4) (5) (6) (7) (8) (9)
3mm CN(1–0) 34 32 4.4 1.7 66 0.05 1.1 50 0.04
C17O(1–0) 27
34
26
20
5.8
4.2
0.23 10 0.006 0.1 11 0.007
13CO(1–0) 27
34
142
116
4.9
3.6
5.5 250 0.15 4.2 280 0.15
C18O(1–0) 27
34
40
33
4.7
3.4
1.2 52 0.033 0.9 47 0.030
CS (2–1) 34 15 3.0 0.6 35 0.016 0.4 36 0.014
CH3OH(2–1) 34 13 2.8 0.2 9 0.004 0.1 7 0.004
N2H+ (1–0) 34 14 3.0 0.3 19 0.007 0.2 11 0.006
HC3N(10–9) 34 16 3.7 0.2 10 0.006 0.2 15 0.007

1mm 15 1420 20
12CO(2–1) 27 850 10.6 37 710 1.0 29 750 1.0
34 730 8.8
15 185 17.6
13CO(2–1) 27 103 9.2 3.3 67 0.09 2.3 73 0.08
34 88 7.7
15 88 18.3
C18O(2–1) 27 51 9.4 0.9 21 0.03 0.6 21 0.02
34 41 7.8

Notes. (a)Emission of the central region convolved to the given aperture size. (1) Working resolutions used for each molecular line. (2) Maximum peak temperature observed across the full map of M 51 for a given emission line at a given working resolution. (3) Average channel rms sensitivity at 4 km s–1 channel width. (4, 7) Velocity-integrated brightness temperature within the central aperture. (5,8) S/N within the central aperture. (6,9) line ratio of a given line with respect to the velocity-integrated 12CO (2–1) brightness temperature.

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