Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inverse Compton Scattering of the Central Source Photons as an X-ray
  Emission Mechanism on Kiloparsec Scales in PKS 1127-145   The beamed inverse Compton/cosmic microwave background model has generally
been used for the interpretation of X-ray radiation from kiloparsec-scale jets
of the core-dominated quasars. Recent \textit{Fermi}-LAT and \textit{HST}
observations have brought this model into question. We examine the assumption
that X-rays from the kiloparsec-scale jet of the quasar PKS~1127$-$145 are
produced by inverse Compton scattering of the central source emission. In this
context, we show that both similarity and distinction between the observed
radio and X-ray spectral indices for some of the jet knots can be explained
under a single power-law electron energy distribution. We derive that the
viewing angle of the kiloparsec-scale jet is about $35^\circ$ and the jet has a
moderate relativistic speed of $\approx 0.8c$. The predicted gamma-ray flux of
the jet is found to be a few orders of magnitude lower than the minimum flux
level measured by \textit{Fermi}-LAT, further supporting our scenario.

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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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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: math-ph
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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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: hep-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys