Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polarization of X-ray emission from the Sgr B2 cloud   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,
occurred 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 most clean test of the origin of X-rays from Sgr B2 would be a detection of
polarized emission from this source.

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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph