首页|Lobe-dominated γ-Ray Emission of Compact Symmetric Objects
Lobe-dominated γ-Ray Emission of Compact Symmetric Objects
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The γ-ray emitting compact symmetric objects(CSOs)PKS 1718-649,NGC 3894,and TXS 0128+554 are lobe-dominated in the radio emission.In order to investigate their γ-ray radiation properties,we analyze the～14yr Fermi/LAT observation data of the three CSOs.They all show the low luminosity(1041-1043 erg s-1)and no significant variability in the γ-ray band.Their γ-ray average spectra can be well fitted by a power-law function.These properties of γ-rays are clearly different from the γ-ray emitting CSOs CTD 135 and PKS 1413+135,for which the γ-rays are produced by a restarted aligned jet.In the Lγ-Γγ plane,the three CSOs are also located at the region occupied by radio galaxies(RGs)while CTD 135 and PKS 1413+135 display a similar feature to blazars.Together with a similar radio emission property to γ-ray emitting RGs Cen A and Fornax A,we speculate that theγ-rays of the three CSOs stem from their extended mini-lobes.The broadband spectral energy distributions of the three CSOs can be well explained by the two-zone leptonic model,where their γ-rays are produced by the inverse Compton process of the relativistic electrons in extended regions.By extrapolating the observed Fermi/LAT spectra to the very high energy band,we find that TXS 0128+554 among the three CSOs may be detected by the Cherenkov Telescope Array in the future.
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