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Title:
Infrared imaging and polarimetry of M82 - Evidence for a ring of warm dust
Authors:
Dietz, R. D.; Gehrz, R. D.; Jones, T. J.; Grasdalen, G. L.; Smith, J.; Gullixson, C.; Hackwell, John A.
Affiliation:
AA(Northern Colorado, University, Greeley, CO), AB(Minnesota, University, Minneapolis), AC(Minnesota, University, Minneapolis), AD(Wyoming Infrared Observatory, Laramie), AE(National Center for Atmospheric Research, Boulder, CO)
Publication:
Astronomical Journal (ISSN 0004-6256), vol. 98, Oct. 1989, p. 1260-1264. Research supported by the University of Wyoming, University of Minnesota, NSF, USAF, and Aerospace Corp. (AJ Homepage)
Publication Date:
10/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COSMIC DUST, INFRARED ASTRONOMY, POLARIMETRY, STARBURST GALAXIES, ASTRONOMICAL MAPS, INFRARED IMAGERY, NEAR INFRARED RADIATION
DOI:
10.1086/115213
Bibliographic Code:
1989AJ.....98.1260D

Abstract

Images of the starburst galaxy M82 at 10 microns and 19.5 microns reveal a pair of emission peaks symmetrically flanking the 2.2-micron nucleus. It is argued that these peaks, which lie interior to the CO/H I lobes and along the major axis of the galaxy, are produced by a ring of warm dust heated by young stars of the starburst. Near-infrared polarization measurements of the nucleus show 1-percent linear polarization oriented almost perpendicular to the major axis of the galaxy. This polarization is attributed to scattering by the circumnuclear dust ring. Photometry and polarimetry of the brightest extranuclear source of 2.2-micron emission (K2) are also presented.

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