Fermi Large Area Telescope Detection of Gamma-Rays from NGC 6251 Radio Lobe
| Autor: | Yu, Yu-Wei, Zhang, Hai-Ming, Gan, Ying-Ying, Hu, Xin-Ke, Wu, Tan-Zheng, Zhang, Jin |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We report on the detection of extended $\gamma$-ray emission from lobes in the radio galaxy NGC 6251 using observation data of Fermi Large Area Telescope (Fermi-LAT). The maximum likelihood analysis results show that a radio morphology template provides a better fit than a point-like source description for the observational data at a confidence level of 8.1$\sigma$, and the contribution of lobes accounts for more than 50\% of the total $\gamma$-ray flux. Furthermore, the $\gamma$-ray energy spectra show a significant disparity in shape between the core and lobe regions, with a curved log-parabola shape observed in core region and a power-law form observed in lobes. Neither the core region nor the northwest lobe displays the significant flux variations in the long-term $\gamma$-ray light curves. The broadband spectral energy distributions of both core region and northwest lobe can be will explained with a single-zone leptonic model. The $\gamma$-rays of core region are due to the synchrotron-self-Compton process while the $\gamma$-rays from northwest lobe are interpreted as inverse Compton emission of the cosmic microwave background. Comment: 13 pages,6 figures,3 tables, the Astrophysical Journal, Accepted |
| Databáze: | arXiv |
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