Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dissecting the X-ray Emission in the Young Planetary Nebula NGC 7027   We present analysis of a second observation of the young planetary nebula
(PN) NGC 7027 by the Chandra X-ray Observatory. This latest 59.2 ks exposure
with ACIS-S was acquired approximately 14 years after the initial 18.2 ks
ACIS-S observation, and the improved photon statistics allow us to perform a
detailed spatial and spectral analysis of the X-ray emission. Comparison with
multiwavelength imaging of NGC 7027 reveals a strong anti-correlation between
extinction across the nebula and the soft band X-ray emission. Dissecting the
X-ray emission into low- and high-extinction regions results in more robust
characterization of the plasma spectral properties. We determine that the X-ray
emitting plasma has a temperature of $\sim3.6$ MK, is deficient in Fe, and has
an X-ray luminosity of $L_{\rm X}\sim7\times10^{31}{\rm ~erg~s}^{-1}$, all of
which are generally consistent with the plasma properties found in PN hot
bubbles. We find no evidence of evolution in the X-ray surface brightness over
the 14 year baseline between Chandra observations. Our analysis underscores the
importance of accounting for nebular absorption of the X-ray emission in
accurately determining plasma properties for hot bubbles within PNe.

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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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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: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex