The coal model for the unidentified infrared bands. II - The thermal emission mechanism

Details The coal model for the unidentified infrared bands. II - The thermal emission mechanism The coal model for the unidentified infrared bands. II - The thermal emission mechanism

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..215p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 1, July 1991, p. 215-225.

Astronomy and Astrophysics

Astronomy

30

Coal, Infrared Sources (Astronomy), Interstellar Matter, Thermal Emission, Astronomical Models, Spectral Bands

Scientific paper

The present study examines new spectroscopic data in support of the coal model for the composition and structure of the unidentified infrared band (UIB) emitters. The problem of the emission mechanism is addressed, with emphasis on coal emission in thermal equilibrium. An original technique based on the measurement of the amplitude and the phase of the sample emission under irradiation by a chopped beam of UV/visible light is used. Absorptivity curves are obtained in the range of about 300 to 600 K, from which spectral emissions are deduced. They compare reasonably well with the spectra of various astronomical sources, showing that this is the right range of grain temperatures. All these properties fit the available data on UIBs. Maps of ionized UIB-emitting regions show that the emission peaks at the interface between ionized and dissociated-hydrogen zones. The estimated power carried by electrons in this interface is adequate for heating 100 A-sized grains to about 400 K.

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