Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000immm.proc...73s&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
Other
Scientific paper
The discrete far-infrared (FIR) sources of M31 are identified in the ISO 175 micron map and characterized via their FIR colours, luminosities and masses. They have an average size of 800 pc. At least two λ-2 modified Planck curves with temperatures of about 40 K and 15-21 K are necessary to fit the 60-175 micron spectral energy distributions (SEDs) of the knots. Comparisons with radio and optical tracers show that - statistically - the cold knots can be well identified with CO and HI radio sources and thus might represent mainly molecular cloud complexes. The warm knots coincide with known HII regions and supernova remnants. However, even the cold knots have a considerable luminosity and their discovery raises the question of hidden star formation. The ratio of FIR luminosity to dust mass, L/M, is used to measure the energy content of the dust. The knots have a clear L/M excess over the rest of M31, providing evidence that they are powered by star formation in addition to the interstellar radiation field. Furthermore, the L/M ratio of the warm knots is comparable to that of Galactic HII regions like M42 or NGC2024, while that of the cold knots still reaches values as in the average Orion complex. Thus both the warm and the cold knots are interpreted as containing large cloud complexes with considerable ongoing star formation. The by far brightest knot at 175 micron, northwest of M31's centre, does hardly show up in the mid-infrared and is also inconspicous in any other tracers so far. Additional SCUBA-observations at 850 micron help to confirm its high mass and low temperature.
Haas Marcel
Lemke Deitrich
Schmidtobreick Linda
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