1300-micron continuum observations of M82 and NGC 253

Details 1300-micron continuum observations of M82 and NGC 253 1300-micron continuum observations of M82 and NGC 253

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240..232k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 2, Dec. 1990, p. 232-236.

Astronomy and Astrophysics

Astrophysics

43

Irregular Galaxies, Starburst Galaxies, Carbon Monoxide, Cosmic Dust, Galactic Evolution, Interstellar Matter, Spatial Resolution

Scientific paper

1300-micron continuum maps of the central parts in the star burst galaxies M82 and NGC 253 are presented, showing the dust distribution with unprecedented spatial resolution. The dust in M82 has an elongated shape with a pronounced maximum; another weaker one is coincident with the 2.2-micron peak. Estimates for the dust temperature are discussed, and a mass Mg of 8.7 x 10 to the 8th solar masses of interstellar matter is derived within a distance of 500 pc from the center of M82. Interestingly, this mass of gas equals the mass of stars. A similar analysis for NGC 253, which also exhibits an elongated dust distribution, yields a gas mass of 4.2 x 10 to the 8th solar masses. Compared to M82, this mass is confined to a much smaller volume indicating a higher gas density and thus an earlier stage of the star burst evolution.

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