Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291l...5b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 1, p. L5-L8
Astronomy and Astrophysics
Astronomy
41
Cosmic Dust, Infrared Astronomy, Infrared Radiation, Infrared Spectra, Interstellar Extinction, Interstellar Matter, Abundance, Emissivity, Polycyclic Aromatic Hydrocarbons, Temperature Distribution
Scientific paper
We present the spectral distribution of dust in the diffuse Interstellar (ISM) as derived from the first release of the DIRBE (Diffuse Infrared Background Explorer) data, in the wavelength range from 3.5 to 240 micrometers. Although the spectrum of diffuse regions strongly decreases from 12 micrometers toward shorter wavelengths, it is found that some dust emission is still present in the L and M bands. On average, it corresponds to approximately = 1% of the total IR emission. The comparison with the 3.3 micrometer Polycyclic Aromatic Hydrocarbon (PAH) feature emissivity of the diffuse medium in the inner galaxy shows that only a small fraction (8-16%) of the DIRBE L and ISM emission is likely to be produced by the 3.3 micrometer feature. Along with the presence of an important dust emission in the DIRBE M band, where no PAH feature is expected, this implies that a continuum component and/or other features from dust also contribute significantly to the short wavelength emission. The carrier of this emission still has to be identified. Large color variations are observed from region to region over most of the DIRBE range, which might reflect abundance variations of the various dust components.
Bernard J.-Ph.
Boulanger Francois
Desert François Xavier
Giard Martin
Helou George
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