Physics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50077p&link_type=abstract
Spitzer Proposal ID #50077
Physics
Scientific paper
Despite the increasing evidence that the anomalous emission is a new physical mechanism acting in the diffuse interstellar medium, the nature and distribution of this component remains elusive. In particular, the infrared properties of the sources which, to date, are known to exhibit microwave excess, are very poorly known mostly due to the limited angular resolution and frequency coverage of DIRBE and IRAS. We propose to analyze archival observations of anomalous emission regions in order to characterize the typical dust population and environment, in particular the grain size, grain constituents and radiation field hardness, in these regions. A search in the Spitzer archive has revealed that almost the entirety of the objects with signatures of anomalous emission have been observed by its instruments. In addition, Spitzer data, with their unique combination of high resolution, sensitivity and wide spectral coverage, provide a unique tool for investigating the physical properties of dust in these sources. Such characterization will allow to put tight constraints on the existing models and provide new predictions on the level of contamination expected in future CMB experiments.
Carey Sean
Casassus Simon
Cleary Kieran
Dickinson Clive
Flagey Nicolas
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