anomalous microwave emission
(component of microwave background discovered in the 1990s)
Anomalous microwave emission (AME) refers
to a component of the microwave background
coming from regions of Milky Way dust
that was uncovered by COBE in 1995.
Its frequency is on the order of 30GHz
but varies by region. It is relatively flat
(a spectral index close to zero),
a hint that it is some type of free-free radiation.
It was labeled anomalous because no mechanism was known by which
such dust would produce it.
It has been a subject of study since, both for
understanding dust and for understanding its precise
effect on the microwave background: the exact observed pattern
of the cosmic microwave background is of high interest in cosmology,
which requires careful accounting of any other microwave
sources. A number of theories for AME production
have been developed, one being spinning dust grains.
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|10mm||30GHz||124μeV||anomalous microwave emission|