Other
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.2603f&link_type=abstract
American Astronomical Society Meeting 202, #26.03; Bulletin of the American Astronomical Society, Vol. 35, p.733
Other
Scientific paper
Sgr A East appears to be a single, mixed-morphology 10,000-year-old supernova remnant (SNR) at the Galactic center. It also appears to belong to a class of remnants that have been observed and detected at 1720 MHz, the transition frequency of OH maser emission. However, if the EGRET source 3EG J1746-2852 coincident with the Galactic center is itself associated with this object, it would endow it with a γ -ray luminosity almost two orders of magnitude greater than that of the other EGRET-detected SNR's. We here reconsider the viability of a pion-production mechanism as the source of the broadband emission observed from Sgr A East, and show that what connects these objects---and ultimately also accounts for their different γ -ray emissivity---is the very important interaction between the expanding SNR shell and the surrounding molecular cloud environment. The singularly high γ -ray luminosity of Sgr A East, as well as its unusually steep radio spectral index, can thereby be attributed to the high-density (nH=103 cm-3), strong magnetized (B ˜ 0.18 mG) environment in which it is located.
Fatuzzo Marco
Melia Fulvio
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