The High-Resolution CO Survey of M 31

Details The High-Resolution CO Survey of M 31 The High-Resolution CO Survey of M 31

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dms..conf...45n&link_type=abstract

DEEP MILLIMETER SURVEYS Implications for Galaxy Formation and Evolution. Held 19-21 June 2000 in University of Massachusetts, Am

Astronomy and Astrophysics

Astronomy

Scientific paper

We are about to finish a fully sampled high resolution survey of the molecular gas in the nearby spiral M 31. It covers the whole disk (~ 1 sq degree) at 23'' resolution. The good stability of the receivers resulted in a very uniform base level. A typical noise figure in the final spectra is 30 mK rms. The molecular gas in M 31 is distributed in long, narrow spiral arm segments that show a much higher arm/interarm contrast than the atomic gas. Significant molecular emission is found between radii of about 4 kpc to 18 kpc. On average, the ratio of atomic to molecular gas rises with radius. Close to the nucleus a special observing technique was necessary to detect any molecular gas - at a level 10 times lower than in the disk. Strong large-scale streaming motions are absent - they seem to be at the 10 kms-1 level which requires a detailed analysis to disentangle them from the random motions of the molecular clouds. However, several regions in the galaxy show broad and even multiple-component spectra with separations of up to 50 kms-1 generated by local effects.

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