The Sgr B2 giant molecular cloud is claimed to be an ‘X-ray reflection nebula’ — the reprocessing site of a powerful flare of the Sgr A* source, which occurred a few hundred years ago. The shape of the X-ray spectrum and the strength of the iron fluorescent line support this hypothesis. We argue that the cleanest test of the origin of X-rays from Sgr B2 would be a detection of polarized emission from this source.
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Churazov et al. (2002) studied this question.
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