Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Origin of TeV Gamma-ray Emission from HESS J1834-087   We present an X-ray study of the field containing the extended TeV source
HESS J1834-087 using data obtained with the XMM-Newton telescope. Previously,
the coincidence of this source with both the shell-type supernova remnant (SNR)
W41 and a giant molecular cloud (GMC) was interpreted as favoring pi^0-decay
gamma-rays from interaction of the old SNR with the GMC. Alternatively, the TeV
emission has been attributed to inverse Compton scattering from leptons
deposited by PSR J1833-0827, a pulsar assumed to have been born in W41 but now
located 24' from the center of the SNR (and the TeV source). Instead, we argue
for a third possibility, that the TeV emission is powered by a previously
unknown pulsar wind nebula located near the center of W41. The candidate pulsar
is XMMU J183435.3-084443, a hard X-ray point source that lacks an optical
counterpart to R>21 and is coincident with diffuse X-ray emission. The X-rays
from both the point source and diffuse feature are evidently non-thermal and
highly absorbed. A best fit power-law model yields photon index Gamma ~ 0.2 and
Gamma ~ 1.9, for the point source and diffuse emission, respectively, and 2-10
keV flux ~ 5 X 10^(-13) ergs/cm^(2)/s for each. At the measured 4 kpc distance
of W41, the observed X-ray luminosity implies an energetic pulsar with Edot ~
10^(36)d_4^2 ergs/s, which is also sufficient to generate the observed
gamma-ray luminosity of 2.7 X 10^(34)d_4^2 ergs/s via inverse Compton
scattering.

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The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph