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3C 207 is a lobe-dominant radio galaxy with one sided jet and the brightknots in kpc-Mpc scale were resolved in the radio, optical and X-ray bands. Itwas confirmed as a gamma-ray emitter with Fermi/LAT, but it is uncertainwhether the gamma-ray emission region is the core or knots due to the lowspatial resolution of Fermi/LAT. We present an analysis of its Fermi/LAT datain the past 9 years. Different from the radio and optical emission from thecore, it is found that the gamma-ray emission is steady without detection offlux variation over 2 sigma confidence level. This likely implies that thegamma-ray emission is from its knots. We collect the radio, optical, and X-raydata of knot-A, the closest knot from the core at 1 arcsec, and compile itsspectral energy distribution (SED). Although the single-zonesynchrotron+SSC+IC/CMB model by assuming knot-A at rest can reproduce the SEDin the radio-optical-X-ray band, the predicted gamma-ray flux is lower than theLAT observations and the derived magnetic field strength deviates theequipartition condition with 3 orders of magnitude. Assuming that knot-A isrelativistically moving, its SED from radio to gamma-ray bands would be wellrepresented with the single-zone synchrotron+SSC+IC/CMB model under theequipartition condition. These results likely suggest that the gamma-rayemission may be from knot-A via the IC/CMB process and the knot should haverelativistical motion. The jet power derived from our model parameters is alsoroughly consistent with the kinetic power estimated with the radio data.

Fermi/LAT observations of Lobe-dominant Radio Galaxy 3C 207 and Possible Radiation Region of the Gamma-Rays