Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermi/LAT observations of Lobe-dominant Radio Galaxy 3C 207 and Possible
  Radiation Region of the Gamma-Rays   3C 207 is a lobe-dominant radio galaxy with one sided jet and the bright
knots in kpc-Mpc scale were resolved in the radio, optical and X-ray bands. It
was confirmed as a gamma-ray emitter with Fermi/LAT, but it is uncertain
whether the gamma-ray emission region is the core or knots due to the low
spatial resolution of Fermi/LAT. We present an analysis of its Fermi/LAT data
in the past 9 years. Different from the radio and optical emission from the
core, it is found that the gamma-ray emission is steady without detection of
flux variation over 2 sigma confidence level. This likely implies that the
gamma-ray emission is from its knots. We collect the radio, optical, and X-ray
data of knot-A, the closest knot from the core at 1 arcsec, and compile its
spectral energy distribution (SED). Although the single-zone
synchrotron+SSC+IC/CMB model by assuming knot-A at rest can reproduce the SED
in the radio-optical-X-ray band, the predicted gamma-ray flux is lower than the
LAT observations and the derived magnetic field strength deviates the
equipartition condition with 3 orders of magnitude. Assuming that knot-A is
relativistically moving, its SED from radio to gamma-ray bands would be well
represented with the single-zone synchrotron+SSC+IC/CMB model under the
equipartition condition. These results likely suggest that the gamma-ray
emission may be from knot-A via the IC/CMB process and the knot should have
relativistical motion. The jet power derived from our model parameters is also
roughly consistent with the kinetic power estimated with the radio data.

15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph