| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - The far-infrared continuum spectrum of the Milky Way explained by a dust and gas model
|
| Date
| |
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - 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 radiation of molecular hydrogen gas in the outer Galaxy. The dust model is based on an empirically tested 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 gas source is conceivable as a small part of cold molecular hydrogen and helium gas in the outer Galaxy which is only observable in a small temperature interval at 11 K and at corresponding (equilibrium ) condensation densities of about $\rm 4.5\cdot 10^{18} \; cm ^{-3}$. It is assumed that the high densities occur in very small and short-living inhomogeneities of the fractal-structured gas due to self-gravitation, turbulence and starting condensation in the elementary fragments, i.e. the gas is at a stage close to star formation. Preliminary tests show that the gas sources are very likely correlated with the well-known HI sources in the outer Galaxy. The gas sources contribute to the spectra still at latitudes up to |b| < 25-30 degrees, while the instrument noise is larger at higher latitudes.
|
| article type
| |
| publisher identifier
| |
| Date Copyrighted
| |
| Rights
| |
| Rights Holder
| |
| is part of this journal
| |
| is primary topic
of | |
