Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of a faint 437 s X-ray pulsar 1SAX J1452.8-5949   A new pulsar, 1SAX J1452.8-5949, was discovered during a BeppoSAX galactic
plane survey on 1999 July 20 at R.A.=14h 52m 49s, Dec=-59 49' 18'' (J2000) with
a 90% confidence uncertainty radius of 50''. Coherent pulsations were detected
with a barycentric period of a 437.4 +/- 1.4 s. The X-ray spectrum can be
modeled by a power-law with a photon index of 1.4 +/- 0.6 and absorption
consistent with the galactic value in the direction of the source ($1.9 \times
10^{22}$ atom cm$^{-2}$). An Fe K line with a equivalent width of
$\approxgt$1.3 keV may be present in the spectrum. The unabsorbed 2-10 keV flux
is $9 \times 10^{-13}$ erg cm$^{-2}$s$^{-1}$. The X-ray properties and lack of
an obvious optical counterpart are consistent with a Be star companion at a
distance of between approximately 6 and 12 kpc which implies a luminosity of
(4-15)$\times 10^{33}$ erg s$^{-1}$.

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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex