IRAS large-beam and ground-based small-beam measurements of the unidentified 11.3 and forbidden NE II 12.8 micron line fluxes in the starburst galaxy M82

Details IRAS large-beam and ground-based small-beam measurements of the unidentified 11.3 and forbidden NE II 12.8 micron line fluxes in the starburst galaxy M82 IRAS large-beam and ground-based small-beam measurements of the unidentified 11.3 and forbidden NE II 12.8 micron line fluxes in the starburst galaxy M82

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..592l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 592-595.

Astronomy and Astrophysics

Astronomy

8

Astronomical Spectroscopy, Galactic Structure, Infrared Spectra, Line Spectra, Radiant Flux Density, Star Formation, Starburst Galaxies, Cosmic Dust, Galactic Nuclei, H Ii Regions, Infrared Astronomy Satellite, Neon

Scientific paper

The low resolution spectrometer data obtained by IRAS on M82, when compared with smaller ground-based beam 8-14 micron spectra, provide interesting beam-dependent ratios of the fluxes for the 'unidentified' 11.3 micron emission feature, the forbidden Ne II 12.8 micron fine structure line, and the 10 micron continuum. Specifically, the relative strengths of the 11.3 micron feature and the 10 continuum are constant for the small and large beam diameters, concordant with published interpretations of both as being associated with dusty regions of thermal radiation. By contrast, the relative strength of either the 11.3 micron feature or 10 micron continuum fluxes to the forbidden Ne II 12.8 micron line flux increases modestly from the smaller to the larger IRAS beam diameter. This is taken as evidence for significant amounts of warm dust above that associated with the H II regions in the nucleus of M82.

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