Warm dust in the neutral interstellar medium
F. Boulanger, B. Baud, G. D. van Albada;
AaA, 1985, 144, L9
ABSTRACT:A comparative study of H I and IRAS maps of a 20 x 18 deg field at high galactic latitude is presented.
The galactic infrared emission is shown to be
well correlated with the H I distribution.
A quantitative relation
between H I column density and far-infrared surface brightness is
derived.
From this correlation the possible use of IRAS observations to map high
galactic latitude extinction is discussed.
The infrared spectrum of one
diffuse H I cloud, from 12 to 100 microns is presented.
Its emission in the
mid-infrared (12 and 25 microns) is several orders of magnitude larger than
predicted by standard dust models.
The power radiated at 12 microns represents
25 percent of the 100 microns emission.
The spectrum presents a minimum
at 25 microns.
The implications of these results on interstellar dust
properties are discussed.
KEYWORDS: cosmic dust, hydrogen clouds, infrared astronomy, interstellar extinction, interstellar matter, neutral gases, astronomical maps, emission spectra, galactic radiation, heliosphere, infrared astronomy satellite, infrared spectra
PERSOKEY:dust, iras, fir, mir, cirrus, h_i, 21 cm, ,
CODE: boulanger85