Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ASCA observations of two SNRs and NEI analysis   Based on the data from the \asca observation of SNRs Kes79 and W49B, we
present here the analysis of their X-ray spectra and morphologies. The Kes79
spectrum can be well fitted by a single NEI component, and the narrow-band
images of that source show an inhomogeneous distribution of heavy elements. The
heavy elements are richest in the positions S, SE and SW of Kes79, where there
may exist interaction between shocks and molecular clouds implied by radio
observations. For W49B we present here the non-equilibrium ionization (NEI)
analysis based on its emission line diagnostics, and the spectral fit using two
NEI components. The reverse shock in W49B may be still hot and we don't find
evidence for a hotter blast wave in \asca spectra.

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The categories of this paper are: math
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat