Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369..135t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 1, 1991, p. 135-146.
Astronomy and Astrophysics
Astrophysics
107
Barred Galaxies, Galactic Structure, Infrared Imagery, Interstellar Matter, Starburst Galaxies, Gas Dynamics, H Ii Regions, Optical Thickness, Star Formation, Stellar Luminosity
Scientific paper
New 1-30-micron images of the starburst galaxy M82 are presented. The appearance of M82 at 2 microns indicates that a bar about 1 kpc long is located at its center. This bar may dramatically influence the gas dynamics and may have caused the formation of the central gas and dust toroid associated with the luminous episode of star formation. The mid-IR maps define the structure of the toroid out to 30 microns and show that the extent of the emitting region is at least 1.3 kpc. The absorption optical depth determined from 1-2 micron colors corresponds to A(v) less than about 8 and is distributed in a ridge spanning the starburst region and closely resembling the distribution of H I optical depth. Finally, the contribution that very small grains may make to the 10-micron emission is considered, and it is concluded, by comparison to Galactic H II regions, that their mid-IR emission is significant.
Campins Humberto
Decher Rudolf
Dietz Klaus
Joy Marhshall
Telesco Charles M.
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