Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multiwavelength analysis and the difference in the behavior of the
  spectral features during the 2010 and 2014 flaring periods of the blazar 3C
  454.3   The flat-spectrum radio quasar 3C~454.3 throughout the years has presented
very high activity phases (flares) in which the different wavebands increase
their flux dramatically. In this work, we perform multiwavelength analysis from
radio to gamma-rays and study the Mg~II~$\lambda 2798$\AA\ emission line and
the UV~Fe~II band from 2008-2018. We found that an increase in the 43 GHz flux
density of the quasi-stationary component C, coincides with the estimated time
at which a superluminal blob ejected from the radio core (which caused the
brightest flare of 2010) collides with the quasi-stationary component (at a
projected distance of $\sim4.6$ pc from the radio core). The spectral index
different behavior in the first ($5000 < \text{JD}-2450000 < 5600$) and second
($6600 < \text{JD}-2450000 < 7900$) flaring periods suggest changes in the
physical conditions. The complex nature of the second period can be a result of
a superposition of multiple events at different locations. The Mg~II has an
anti-correlation with the UV-continuum while Fe~II correlates positively.
Except by the time of the brightest flare of 2010, when both have a strong
response at high continuum luminosities. Our results suggest that the dominant
gamma-ray emission mechanism for the first flaring period is External Compton.
For the second flaring period the seed photons emission region is co-spatial
with the gamma-ray emission region. However, a SED study using a multizone jet
emission model is required to confirm the nature of each significant flare
during the second period.

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The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph