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- W1972345082 abstract "Sgr A East appears to be a single, mixed-morphology 10,000 yr 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 2 orders of magnitude greater than that of the other EGRET-detected SNRs. 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), strongly magnetized (B ~ 0.18 mG) environment in which it is located." @default.
- W1972345082 created "2016-06-24" @default.
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- W1972345082 date "2003-10-20" @default.
- W1972345082 modified "2023-10-09" @default.
- W1972345082 title "A Kinship between the EGRET Supernova Remnants and Sagittarius A East" @default.
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- W1972345082 doi "https://doi.org/10.1086/378041" @default.
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