Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...506..797j&link_type=abstract
Astronomy and Astrophysics, Volume 506, Issue 2, 2009, pp.797-798
Astronomy and Astrophysics
Astrophysics
3
Dust, Extinction, Ism: Lines And Bands
Scientific paper
Context: The origin of the anomalous microwave emission is not yet identified but it may be associated with (spinning) dust. Aims: We point out that the emission from low-energy, solid-state structural transitions, apparent over a range of dust temperatures, and particularly important at low dust temperatures (Td < 30 K), could provide an origin for the excess microwave emission. Methods: The physics of two-level systems (TLS) within amorphous materials is applied within the context of interstellar dust. Results: TLS systems, which are thought to be at the origin of the temperature-dependent emissivity of interstellar dust, should reveal their existence at long wavelengths in the emission from dust. Conclusions: Low-energy, structural transitions in amorphous interstellar grains could make a contribution to the anomalous microwave emission, which should correlate with the emission from dust components with temperatures less than about 30 K.
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