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The core dominance parameter and Fermi detection of extragalactic radio sources
Liu ZhenKuo1; Wu ZhongZu1; Gu MinFeng2
2016
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume16Issue:8Pages:118
AbstractBy cross-correlating an archive sample of 542 extragalactic radio sources with the Fenni-LAT Third Source Catalog (3FGL), we have compiled a sample of 80 gamma-ray sources and 462 non-Fermi sources with available core dominance parameter (RcD), and core and extended radio luminosity; all the parameters are directly measured or derived from available data in the literature. We found that ROD has significant correlations with radio core luminosity, gamma-ray luminosity and gamma-ray flux; the Fermi sources have on average higher ROD than non-Fermi sources. These results indicate that the Fermi sources should be more compact, and the beaming effect should play a crucial role in the detection of gamma-ray emission. Moreover, our results also show Fermi sources have systematically larger radio flux than non-Fermi sources at fixed RcD, indicating larger intrinsic radio flux in Fermi sources. These results show a strong connection between radio and gamma-ray flux for the present sample and indicate that the non-Fermi sources are likely due to the low beaming effect, and/or the low intrinsic gamma-ray flux. This supports a scenario that has been published in the literature: a co-spatial origin of the activity for the radio and gamma-ray emission, suggesting that the origin of the seed photons for the high-energy gamma-ray emission is within the jet.
KeywordLARGE-AREA TELESCOPE ACTIVE GALACTIC NUCLEI VLBI OBSERVATIONS RAY CONNECTION LOUD BLAZARS GALAXIES CATALOG SAMPLE BL Lacertae objects: general galaxies: active quasars: general galaxies: general gamma-rays: general
Language英语
Funding Project[National Natural Science Foundation of China] ; [Science and Technology Commission of Shanghai Municipality]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/63146
Collection中国科学院国家天文台
Affiliation1.贵州大学
2.中国科学院国家天文台
Recommended Citation
GB/T 7714
Liu ZhenKuo,Wu ZhongZu,Gu MinFeng. The core dominance parameter and Fermi detection of extragalactic radio sources[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(8):118.
APA Liu ZhenKuo,Wu ZhongZu,&Gu MinFeng.(2016).The core dominance parameter and Fermi detection of extragalactic radio sources.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(8),118.
MLA Liu ZhenKuo,et al."The core dominance parameter and Fermi detection of extragalactic radio sources".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.8(2016):118.
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