학술논문

Discovery of Very-high-energy Gamma-ray Emissions from the Low Luminosity AGN NGC 4278 by LHAASO
Document Type
Working Paper
Author
Cao, ZhenAharonian, F.An, Q.AxikeguBai, Y. X.Bao, Y. W.Bastieri, D.Bi, X. J.Bi, Y. J.Cai, J. T.Cao, Q.Cao, W. Y.Cao, ZheChang, J.Chang, J. F.Chen, A. M.Chen, E. S.Chen, LiangChen, LinChen, LongChen, M. J.Chen, M. L.Chen, Q. H.Chen, S. H.Chen, S. Z.Chen, T. L.Chen, Y.Cheng, N.Cheng, Y. D.Cui, M. Y.Cui, S. W.Cui, X. H.Cui, Y. D.Dai, B. Z.Dai, H. L.Dai, Z. G.DanzengluobuDong, X. Q.Duan, K. K.Fan, J. H.Fan, Y. Z.Fang, J.Fang, K.Feng, C. F.Feng, L.Feng, S. H.Feng, X. T.Feng, Y. L.Gabici, S.Gao, B.Gao, C. D.Gao, L. Q.Gao, Q.Gao, W.Gao, W. K.Ge, M. M.Geng, L. S.Giacinti, G.Gong, G. H.Gou, Q. B.Gu, M. H.Guo, F. L.Guo, X. L.Guo, Y. Q.Guo, Y. Y.Han, Y. A.He, H. H.He, H. N.He, J. Y.He, X. B.He, Y.Hor, Y. K.Hou, B. W.Hou, C.Hou, X.Hu, H. B.Hu, Q.Hu, S. C.Huang, D. H.Huang, T. Q.Huang, W. J.Huang, X. T.Huang, X. Y.Huang, Y.Huang, Z. C.Ji, X. L.Jia, H. Y.Jia, K.Jiang, K.Jiang, X. W.Jiang, Z. J.Jin, M.Kang, M. M.Ke, T.Kuleshov, D.Kurinov, K.Li, B. B.Li, ChengLi, CongLi, D.Li, F.Li, H. B.Li, H. C.Li, H. Y.Li, J.Li, JianLi, JieLi, K.Li, W. L.Li, X. R.Li, XinLi, Y. Z.Li, ZheLi, ZhuoLiang, E. W.Liang, Y. F.Lin, J.Liu, B.Liu, C.Liu, D.Liu, H.Liu, H. D.Liu, J.Liu, J. L.Liu, J. Y.Liu, M. Y.Liu, R. Y.Liu, S. M.Liu, W.Liu, Y.Liu, Y. N.Lu, R.Luo, Q.Lv, H. K.Ma, B. Q.Ma, L. L.Ma, X. H.Mao, J. R.Min, Z.Mitthumsiri, W.Mu, H. J.Nan, Y. C.Neronov, A.Ou, Z. W.Pang, B. Y.Pattarakijwanich, P.Pei, Z. Y.Qi, M. Y.Qi, Y. Q.Qiao, B. Q.Qin, J. J.Ruffolo, D.Sáiz, A.Semikoz, D.Shao, C. Y.Shao, L.Shchegolev, O.Sheng, X. D.Shu, F. W.Song, H. C.Stenkin, Yu. V.Stepanov, V.Su, Y.Sun, Q. N.Sun, X. N.Sun, Z. B.Tam, P. H. T.Tang, Q. W.Tang, Z. B.Tian, W. W.Wang, C.Wang, C. B.Wang, G. W.Wang, H. G.Wang, H. H.Wang, J. C.Wang, K.Wang, L. P.Wang, L. Y.Wang, P. H.Wang, R.Wang, W.Wang, X. G.Wang, X. Y.Wang, Y.Wang, Y. D.Wang, Y. J.Wang, Z. H.Wang, Z. X.Wang, ZhenWang, ZhengWei, D. M.Wei, J. J.Wei, Y. J.Wen, T.Wu, C. Y.Wu, H. R.Wu, S.Wu, X. F.Wu, Y. S.Xi, S. Q.Xia, J.Xia, J. J.Xiang, G. M.Xiao, D. X.Xiao, G.Xin, G. G.Xin, Y. L.Xing, Y.Xiong, Z.Xu, D. L.Xu, R. F.Xu, R. X.Xu, W. L.Xue, L.Yan, D. H.Yan, J. Z.Yan, T.Yang, C. W.Yang, F.Yang, F. F.Yang, H. W.Yang, J. Y.Yang, L. L.Yang, M. J.Yang, R. Z.Yang, S. B.Yao, Y. H.Yao, Z. G.Ye, Y. M.Yin, L. Q.Yin, N.You, X. H.You, Z. Y.Yu, Y. H.Yuan, Q.Yue, H.Zeng, H. D.Zeng, T. X.Zeng, W.Zha, M.Zhang, B. B.Zhang, F.Zhang, H. M.Zhang, H. Y.Zhang, J. L.Zhang, L. X.Zhang, LiZhang, P. F.Zhang, P. P.Zhang, R.Zhang, S. B.Zhang, S. R.Zhang, S. S.Zhang, X.Zhang, X. P.Zhang, Y. F.Zhang, YiZhang, YongZhao, B.Zhao, J.Zhao, L.Zhao, L. Z.Zhao, S. P.Zheng, F.Zheng, J. H.Zhou, B.Zhou, H.Zhou, J. N.Zhou, M.Zhou, P.Zhou, R.Zhou, X. X.Zhu, C. G.Zhu, F. R.Zhu, H.Zhu, K. J.Zou, Y. C.Zuo, X.
Source
Subject
Astrophysics - High Energy Astrophysical Phenomena
Language
Abstract
The first source catalog of Large High Altitude Air Shower Observatory reported the detection of a very-high-energy gamma ray source, 1LHAASO J1219+2915. In this paper a further detailed study of the spectral and temporal behavior of this point-like source have been carried. The best-fit position of the TeV source ($\rm{RA}=185.05^{\circ}\pm0.04^{\circ}$, $\rm{Dec}=29.25^{\circ}\pm0.03^{\circ}$) is compatible with NGC 4278 within $\sim0.03$ degree. Variation analysis shows an indication of the variability at a few months level in the TeV band, which is consistent with low frequency observations. Based on these observations, we report the detection of TeV $\gamma$-ray emissions from this low-luminosity AGN NGC 4278. The observations by LHAASO-WCDA during active period has a significance level of 8.8\,$\sigma$ with best-fit photon spectral index $\varGamma=2.56\pm0.14$ and a flux $f_{1-10\,\rm{TeV}}=(7.0\pm1.1_{\rm{sta}}\pm0.35_{\rm{syst}})\times10^{-13}\,\rm{photons\,cm^{-2}\,s^{-1}}$, or approximately $5\%$ of the Crab Nebula. The discovery of VHE from NGC 4278 indicates that the compact, weak radio jet can efficiently accelerate particles and emit TeV photons.
Comment: 11 pages, 5 figures