Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: IGR J16393-4643: a new heavily-obscured X-ray pulsar   An analysis of the high-energy emission from IGR J16393-4643 (=AX
J1639.0-4642) is presented using data from INTEGRAL and XMM-Newton. The source
is persistent in the 20-40 keV band at an average flux of 5.1x10^-11
ergs/cm2/s, with variations in intensity by at least an order of magnitude. A
pulse period of 912.0+/-0.1 s was discovered in the ISGRI and EPIC light
curves. The source spectrum is a strongly-absorbed (nH=(2.5+/-0.2)x10^23
atoms/cm2) power law that features a high-energy cutoff above 10 keV. Two iron
emission lines at 6.4 and 7.1 keV, an iron absorption edge >7.1 keV, and a soft
excess emission of 7x10^-15 ergs/cm2/s between 0.5-2 keV, are detected in the
EPIC spectrum. The shape of the spectrum does not change with the pulse. Its
persistence, pulsation, and spectrum place IGR J16393-4643 among the class of
heavily-absorbed HMXBs. The improved position from EPIC is R.A.
(J2000)=16:39:05.4 and Dec.=-46:42:12 (4" uncertainty) which is compatible with
that of 2MASS J16390535-4642137.

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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: physics