Large-scale properties of interstellar dust and gas in M33

Details Large-scale properties of interstellar dust and gas in M33 Large-scale properties of interstellar dust and gas in M33

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...218...78d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 78-88.

Astronomy and Astrophysics

Astronomy

17

Cosmic Dust, Galactic Structure, Infrared Sources (Astronomy), Interstellar Gas, Spiral Galaxies, Astronomical Maps, Emissivity, Infrared Astronomy Satellite

Scientific paper

IRAS observations of M33 are used to study the large-scale characteristics of interstellar dust. At the four IRAS wavelengths, the M33 emission can be separated into a diffuse disk and a bright point-source component. The point-source emission is shown to be associated with star-formation regions and to contribute half of the total IR luminosity of M33. The diffuse disk emission displays spectral characteristics similar to the Galactic cirrus. The results suggest that large particles are selectively destructed by the more intense interstellar radiation field near the center of M33. A steep radial decrease of the dust-to-(atomic) gas ratio is found. The results are consistent with the grain model of Draine and Anderson (1985).

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