CO, HI and dust in M31

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Scientific paper

We have mapped the Andromeda galaxy in the 12CO(1-0) line transition with a resolution of 23 arcsec. The On-the-Fly observing technique enabled us to survey a region of 2o x 0.5o with the unprecedented spatial resolution of 90 pc x 420 pc. The distribution of integrated CO emission is studied in comparison to that of HI and to dust emission at 175 micron. All three tracers of the ISM follow the same arm crest but carbon monoxide is much more concentrated in spiral arms than the others. CO has a high arm-interarm ratio which makes it an ideal tracer of spiral arm structure. Furthermore, we found that the column density of the total gas correlates best with emission from cold dust at about 16 Kelvin.

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