Mapping M31 in submillimetre dust emission

Details Mapping M31 in submillimetre dust emission Mapping M31 in submillimetre dust emission

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000immm.proc...77g&link_type=abstract

The interstellar medium in M31 and M33. Proceedings 232. WE-Heraeus Seminar, 22-25 May 2000, Bad Honnef, Germany. Edited by El

Computer Science

Scientific paper

M31 is an ideal testbed for studying global star formation processes in spiral galaxies. However, its proximity to us is also a major drawback for submillimetre observing, as it is very difficult to subtract sky emission over degree-size scales. Recently, a new fast-scanning technique has been developed for the SCUBA camera at the JCMT, allowing us to map continuously regions up to 45 arcmin across. We have thus begun a complete map of M31 in submillimetre dust emission, at a wavelength of 850 micron, and some preliminary results are discussed here. Large cloud complexes have been detected, with peaks corresponding to bright far-infrared knots but extending over much greater distances and not limited to the narrow 10 kpc star-forming ring. This cold diffuse dust could add substantially to the total ISM mass of M31, and be comparable to the cold Galactic dust suggested by COBE data.

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