Very small grains and the infrared colors of galaxies

Details Very small grains and the infrared colors of galaxies Very small grains and the infrared colors of galaxies

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376..505h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, Aug. 1, 1991, p. 505-513.

Astronomy and Astrophysics

Astronomy

40

Disk Galaxies, Galactic Radiation, Infrared Photometry, Color, Grains, Infrared Astronomy Satellite, Interstellar Matter

Scientific paper

The contribution of very small grains with fluctuating temperature to the IR emission of disk galaxies is evaluated in light of IRAS data, and the abundance variation of these small grains among galaxies, relative to the 'classical', thermally stable grains, is estimated. It is suggested that the low dispersion in the 'cold' galaxies is representative of the true dispersion in the small-to-large grain abundance ratio among galaxies, while the larger dispersion among warmer galaxies results from increasing optical depth-heating dust effects due to AGNs, in conjunction with the destruction of small dust grains at high radiative energy densities.

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