Origins of the 12-200 micron flux in NGC 6946 - Starlight and continuum dust emission from an SC galaxy

Details Origins of the 12-200 micron flux in NGC 6946 - Starlight and continuum dust emission from an SC galaxy Origins of the 12-200 micron flux in NGC 6946 - Starlight and continuum dust emission from an SC galaxy

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...76..875e&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 76, July 1991, p. 875-910.

Astronomy and Astrophysics

Astronomy

49

Cosmic Dust, Galactic Radiation, Infrared Astronomy, Infrared Radiation, Spiral Galaxies, Stellar Radiation, Brightness Distribution, Continuous Radiation, H Ii Regions, Infrared Astronomy Satellite, Infrared Photometry, Infrared Spectra, Luminous Intensity, Visible Spectrum, Visual Photometry

Scientific paper

Infrared maps and optical CCD images of NGC 6946, a nearly face-on spiral with evidence of active star formation, are presented. Consideration is given, at 1-3 kpc spatial scales, to the relationship of the infrared continuum to spiral and radial structure, tracers of the interstellar medium, and ionizing and nonionizing sources of stellar radiation. Two infrared components were revealed - one with surface brightnesses of 20-60 Jy per 45 arcsec aperture at 160 microns, and the other with a surface brightness of less than 20 Jy. Various continuum distributions show discrete sources coinciding with giant H II regions superposed on a smooth unresolved disk background which decreases exponentially with the radius. The optical and spectral properties of the nuclear source and the disk are described. Dust properties and heating conditions, and far-infrared emitting phases are discussed.

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