|The Australia Telescope National Facility Colloquium|
|15:30-16:30 Wed 12 Jul 2006|
ATNF Basement Meeting Room
(University of Adelaide)
Non-thermal Emission from the Sagittarius B GMC and the Cosmic Ray Spectrum in the Galactic Center Region - Roland Crocker Colloquium
The HESS instrument has recently observed a diffuse flux of gamma-rays in the energy range ~300 GeV - 10 TeV emanating from a large solid angle (~2 deg by 1 deg) around the Galactic centre (GC). Of particular interest, the HESS observations reveal gamma ray emission from the Sagittarius B Giant Molecular Cloud which is located at around 100 pc from the actual GC. In general, over the entire field of observation the gamma-ray emission is correlated with the ambient gas density through the GC region suggesting that the gamma rays ultimately originate in hadronic interactions between a population of cosmic rays (CRs) pervading the region and ambient matter. Prompted by this, using the ATCA, we have made detailed radio observations of Sgr B to see whether we can detect the non-thermal signature of synchrotron emission from the expected ambient secondary electrons and positrons (created in the same hadronic interactions between the GC CR population and ambient gas that
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