Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Suzaku Observations of Tycho's Supernova Remnant   Tycho's supernova remnant was observed by the XIS and HXD instruments onboard
the Suzaku satellite on 2006 June 26-29 for 92 ks. The spectrum up to 30 keV
was well fitted with a two-component model, consisting of a power-law with
photon index of 2.7 and a thermal bremsstrahlung model with temperature of 4.7
keV. The former component can alternatively be modeled as synchrotron emission
from a population of relativistic electrons with an estimated roll-off energy
of around 1 keV. In the XIS spectra, in addition to the prominent Fe K_alpha
line (6.445 keV), we observe for the first time significant K_alpha line
emission from the trace species Cr and Mn at energies of 5.48 keV and 5.95 keV,
respectively. Faint K_beta lines from Ca (4.56 keV) and Fe (7.11 keV) are also
seen. The ionization states of Cr and Mn, based on their line centroids, are
estimated to be similar to that of Fe K_alpha (Fe XV or XVI).

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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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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: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys