Mathematics – Logic
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..204...47b&link_type=abstract
The Extragalactic Infrared Background and its Cosmological Implications, Proceedings of IAU Symposium #204, held 15-18 August 20
Mathematics
Logic
4
Scientific paper
One important difficulty in the analysis of the diffuse infrared emission is the separation of the Solar System, Galactic and extragalactic contributions to the sky emission. The discovery of the far-infrared extragalatic background resulted from the understanding of the dust emission in high latitude regions with low H I column density. Spatial correlation between the COBE sky images with the H I Leiden-Dwingeloo survey in these regions showed that the far-infrared and submillimetre dust emission spectrum is well fitted by a modified Planck curve with an emissivity proportional to ν2 and a temperature of 17.5 K. Further analysis of the COBE data and observations obtained from sub-millimetre balloon borne experiments have since shown the existence of a colder dust (12-15 K) component in molecular clouds and also cirrus clouds transparent to visible star light. I will argue that the transition from warm (17.5 K) to cold dust is correlated with changes in the size distribution and the emissivity of dust grains and that it is a manifestation of the evolution of dust among interstellar medium components. The recent completion of the WHAM Hα survey allows us to estimate the contribution of dust in the Warm Ionized Medium (WIM) to the high latitude far-infrared sky emission which remains the largest source of uncertainty on the strength of the extragalactic background around 150 μ m. It also allows us to compute the free-free emission from the WIM and thereby discuss a potential contribution from spinning dust grains to the sky emission at millemeter and centimeter wavelengths.
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