Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exploring the nature of broadband variability in the FSRQ 3C 273   Detailed investigation of broadband flux variability in the blazar 3C 273
allows us to probe the location and size of emission regions and their physical
conditions. We report the results on correlation studies of the flaring
activity observed between 2008 and 2012. The observed broadband variations were
investigated using the structure function and the discrete correlation
function, and power spectral density analysis (PSD) methods. The PSD analysis
showed that the optical/IR light curve slopes are consistent with the slope of
white noise processes, while, the PSD slopes at radio, X-ray and gamma-ray
energies are consistent with red-noise processes. The flux variations at
gamma-ray and mm-radio bands are found to be significantly correlated. Using
the estimated time lag of (110\pm27) days between gamma-ray and radio light
curves, we constrained the location of the gamma-ray emission region at a
de-projected distance of 1.2\pm0.9 pc from the jet apex. Flux variations at
X-ray bands were found to have a significant correlation with variations at
both radio and \gamma-rays energies. The correlation between X-rays and
gamma-rays light curves suggests presence of two components responsible for the
X-ray emission. A negative time lag of -(50\pm20) days, where the X-rays are
leading the emission, suggests X-rays are emitted closer to the jet apex from a
compact region at a distance of ~(0.5\pm0.4) pc from the jet apex. A positive
time lag of (110\pm20) days suggests jet-base origin of the other X-ray
component at ~(4--5)~pc from the jet apex. The flux variations at radio
frequencies were found to be well correlated with each other such that the
variations at higher frequencies are leading the lower frequencies, which could
be expected in the standard shock-in-jet model.

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The categories of this paper are: acc-phys
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
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The categories of this paper are: solv-int
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an