Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Identifying Breaks and Curvature in the Fermi Spectra of Bright Flat
  Spectrum Radio Quasars   Knowing the site of gamma-ray emission in AGN jets will do much for our
understanding of the physics of the source. In particular, if the emission
region is close to the black hole then absorption of gamma-rays with photons
from the broad-line region could become significant. Such absorption is
predicted to produce two specific spectral breaks in the gamma-ray spectra of
Flat Spectrum Radio Quasars (FSRQs). We test this hypothesis using 3 years of
Fermi observations of nine bright FSRQs. A simple power law fit to the spectrum
of each source can be significantly improved by introducing a break, but the
break energies are inconsistent with those predicted by the double-absorber
model. In some cases the fit can be further improved by a log-parabola. In
addition, by dividing the data from each source into two equal epochs we find
that the best description of an object's spectrum often varies between a
log-parabola and a broken power law.

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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: math
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
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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: q-bio
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The categories of this paper are: patt-sol
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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: hep-ex