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Monday, April 22, 2019 at 4:00pm to 5:00pm
Rockefeller Hall, Schwartz Auditorium
General Physics Colloquium and Gold Lecture, Professor Bruce Draine, Princeton University.
Refreshments from 3:30-3:50 pm
Title: Anomalous Microwave Emission from the Interstellar Medium
Host: Dong Lai
Abstract: The "Anomalous Microwave Emission" (AME) is emission in the 20-60 GHz
range that is spatially correlated with interstellar dust. Discovered
in 1996 by the COBE DMR experiment, the AME is a "foreground" that
needs to be removed to study the CMB. The AME is also an
astrophysical puzzle: the emission process responsible for the AME
One hypothesis is that the AME is electric dipole radiation from
nanoparticles spinning at 20-60 GHz, although other hypotheses have
also been proposed, including thermal fluctuations in the
magnetization of ferromagnetic grain materials. The
existing evidence favors the "spinning dust" hypothesis.