Computer Science
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..386..511s&link_type=abstract
The 13th international conference on spectral line shapes. AIP Conference Proceedings, Volume 386, pp. 511-514 (1997).
Computer Science
Infrared Spectra, Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Molecular Clouds, H2 Clouds, Dense Clouds, And Dark Clouds
Scientific paper
The far-infrared continuum spectra observed in the FIRAS-COBE mission are explained by a one-component dust source in the Galaxy and a cold excess due to collision induced radiation of the primordial mixture of normal molecular hydrogen and helium gas in the outer Galaxy. The dust model is based on an empirical temperature-dependent mass absorption coefficient and a reasonable dust density distribution close to the Galactic plane. The temperature of the dust along the line of sight is determined by a fit curve. The ``dark matter'' candidate cold molecular (normal-) hydrogen gas, in the primordial mixture with 14% helium, has been chosen for the gas model. It is conceivable as condensed gas in hierarchical fractal structured clouds with gravitationally bound elementary fragments in which enormous density gradients occur in gravitational turbulence providing the observed very low volume-filling high density inhomogeneities. The gas spectrum emitted in a small temperature interval at 11 Kelvin and at the estimated (equilibrium-) sublimation density of about 4.5.1018 cm-3 has been found appropriate to accurately fit the remaining cold excess of the FIRAS-COBE spectra all over the sky. It was also found that the fitted column densities of the gas sources are closely correlated with the very specific HI (atomic H) column densities in the outer Galaxy (at RG>Rsolar). There is an alternative to the gas sources: the emission spectrum of a ``cold'' dust source of 7.0 K could equally well fit the remaining cold excess intensity.
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