Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiwavelength variability study and search for periodicity of PKS
  1510-089   Blazars are the most luminous and variable AGNs, and thus excellent probes of
accretion and emission processes close to the central engine. We focus on PKS
1510-089 ($z=0.36$), one of the brightest gamma-ray sources in the Fermi LAT
catalog, to study its complex multi-wavelength variability. PKS 1510-089 was
observed twice in hard X-rays with the IBIS instrument onboard INTEGRAL during
the flares of Jan 2009 and Jan 2010, and simultaneously with Swift and NOT, in
addition to the constant Fermi monitoring. The optical polarization was
measured in several bands on 18 Jan 2010 at the NOT. Using our and archival
data we constructed historical light curves at gamma-to-radio wavelengths
covering nearly 20 years and applied variability tests. We assembled SEDs in
2009 and 2010 and compared them with those at two previous epochs and with a
model based on synchrotron and inverse Compton (IC) radiation. The SED modeling
suggests that the physical quantities that undergo the largest variations are
the total power injected into the emitting region and the random Lorentz factor
of the electron distribution cooling break, that are higher in the higher
gamma-ray states. This suggests a correlation of the injected power with
enhanced activity of the acceleration mechanism. The cooling likely takes place
at a much smaller distance ($\sim$0.03 pc) than the BLR radius. The emission at
a few hundred GeV can be reproduced with IC scattering of highly relativistic
electrons off FIR photons at $\sim$0.2 pc, presumably in a dusty torus. DCF
analysis between the long-term optical and gamma-ray light curves yields a good
correlation with no measurable delay. Our time analysis of the RXTE PCA and
Fermi LAT light curves reveals no obvious (quasi-)periodicities, up to the
maximum time scale (a few years) probed by the light curves, which are severely
affected by red noise.

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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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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: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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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: alg-geom