Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Soft X-ray Spectroscopy of the Cygnus Loop Supernova Remnant   The Cygnus X-ray Emission Spectroscopic Survey (CyXESS) sounding rocket
payload was launched from White Sands Missile Range on 2006 November 20 and
obtained a high resolution spectrum of the Cygnus Loop supernova remnant in the
soft X-rays. The novel X-ray spectrograph incorporated a wire-grid collimator
feeding an array of gratings in the extreme off-plane mount which ultimately
dispersed the spectrum onto Gaseous Electron Multiplier (GEM) detectors. This
instrument recorded 65 seconds of usable data between 43-49.5 \AA in two
prominent features. The first feature near 45 \AA is dominated by the He-like
triplet of \ion{O}{7} in second order with contributions from \ion{Mg}{10} and
\ion{Si}{9}-\ion{Si}{12} in first order, while the second feature near 47.5 \AA
is first order \ion{S}{9} and \ion{S}{10}. Fits to the spectra give an
equilibrium plasma at $\log(T)=6.2$ ($kT_e=0.14$ keV) and near cosmic
abundances. This is consistent with previous observations, which demonstrated
that the soft x-ray emission from the Cygnus Loop is dominated by interactions
between the initial blast wave with the walls of a precursor formed cavity
surrounding the Cygnus Loop and that this interaction can be described using
equilibrium conditions.

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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org