Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Blazar OJ 287 After First VHE Activity: Tracking the Re-emergence of the
  HBL like Component in 2020   We report the re-emergence of a new broadband emission through a detailed and
systematic study of the multi-wavelength spectral and temporal behavior of OJ
287 after its first-ever reported VHE activity in 2017 to date, which includes
the second-highest X-ray flux of the source. The source shows high optical to
X-ray flux variations, accompanied mainly by strong spectral changes. The
optical to X-ray flux variations are correlated and simultaneous except for two
durations when they are anti-correlated. The flux variations, however, are
anti-correlated with the X-ray spectral state while correlated with optical-UV
(ultraviolet). Weekly binned {\it Fermi}-LAT data around the duration of the
highest X-ray activity show a few detections with a log-parabola model but none
with a power-law; yet the extracted LAT spectral energy distribution (SED) of
the high activity duration for both the models is similar and show a hardening
above 1 GeV. Further, near-infrared (NIR) data indicate strong spectral change,
resembling a thermal component. Overall, the combined optical to gamma-ray
broadband spectrum establishes the observed variations to a new
high-energy-peaked (HBL) broadband emission component, similar to the one seen
during the highest reported X-ray flux state of the source in 2017. The
observed activities indicate some peculiar features that seem to be
characteristic of this emission component while its appearance, a few years
around the claimed \(\sim 12\)-year optical outbursts strongly indicate a
connection between the two.

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The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th