NAOC Open IR
Fermi/LAT observations of lobe-dominant radio galaxy 3C 207 and possible radiation region of γ-rays
Guo Shengchu1; Zhang Haiming1; Zhang Jin2; Liang Enwei1
2018
Source Publication天文和天体物理学研究:英文版
ISSN1674-4527
Volume18.0Issue:006Pages:70
Abstract3 C 207 is a lobe-dominant radio galaxy with a one sided jet and bright knots, spanning a kpcMpc scale, which have been resolved in the radio, optical and X-ray bands. This target was confirmed as a γ-ray emitter with Fermi/LAT, but it is uncertain whether the γ-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 acquired during the past 9 years. Different from the radio and optical emission from the core, it is found that theγ-ray emission is steady without detection of flux variation at over a 2σ confidence level. This likely implies that the γ-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 1.4′′, and compile its spectral energy distribution(SED). Although the single-zone synchrotron+SSC+IC/CMB model that assumes knot-A is at rest can reproduce the SED in the radio-optical-X-ray band, the predicted γ-ray flux is lower than the LAT observations and the derived magnetic field strength deviates from the equipartition condition by 3 orders of magnitude. Assuming that knot-A is moving relativistically, its SED from radio to γ-ray bands would be represented well with the single-zone synchrotron+SSC+IC/CMB model under the equipartition condition. These results likely suggest that the γ-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 radio data。
Keywordgalaxies: active -- galaxies: jets -- radiation mechanisms: non-thermal -- galaxies: indi-vidual (3C 207)
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/64735
Collection中国科学院国家天文台
Affiliation1.广西大学
2.中国科学院国家天文台
Recommended Citation
GB/T 7714
Guo Shengchu,Zhang Haiming,Zhang Jin,et al. Fermi/LAT observations of lobe-dominant radio galaxy 3C 207 and possible radiation region of γ-rays[J]. 天文和天体物理学研究:英文版,2018,18.0(006):70.
APA Guo Shengchu,Zhang Haiming,Zhang Jin,&Liang Enwei.(2018).Fermi/LAT observations of lobe-dominant radio galaxy 3C 207 and possible radiation region of γ-rays.天文和天体物理学研究:英文版,18.0(006),70.
MLA Guo Shengchu,et al."Fermi/LAT observations of lobe-dominant radio galaxy 3C 207 and possible radiation region of γ-rays".天文和天体物理学研究:英文版 18.0.006(2018):70.
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