Discovery of Very High Energy Gamma-Ray Emissions from the Low-luminosity AGN NGC 4278 by LHAASO
Issued Date
2024-08-01
Resource Type
ISSN
20418205
eISSN
20418213
Scopus ID
2-s2.0-85202455399
Journal Title
Astrophysical Journal Letters
Volume
971
Issue
2
Rights Holder(s)
SCOPUS
Bibliographic Citation
Astrophysical Journal Letters Vol.971 No.2 (2024)
Suggested Citation
Cao Z., Aharonian F., Axikegu, Bai Y.X., Bao Y.W., Bastieri D., Bi X.J., Bi Y.J., Bian W., Bukevich A.V., Cao Q., Cao W.Y., Cao Z., Chang J., Chang J.F., Chen A.M., Chen E.S., Chen H.X., Chen L., Chen L., Chen L., Chen M.J., Chen M.L., Chen Q.H., Chen S., 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., Danzengluobu, Dong X.Q., Duan K.K., Fan J.H., Fan Y.Z., Fang J., Fang J.H., Fang K., Feng C.F., Feng H., Feng L., Feng S.H., Feng X.T., Feng Y., Feng Y.L., Gabici S., Gao B., Gao C.D., 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., Hasan M., He H.H., He H.N., He J.Y., 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., Ji X.L., Jia H.Y., Jia K., Jiang K., Jiang X.W., Jiang Z.J., Jin M., Kang M.M., Karpikov I., Kuleshov D., Kurinov K., Li B.B. Discovery of Very High Energy Gamma-Ray Emissions from the Low-luminosity AGN NGC 4278 by LHAASO. Astrophysical Journal Letters Vol.971 No.2 (2024). doi:10.3847/2041-8213/ad5e6d Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/100927
Title
Discovery of Very High Energy Gamma-Ray Emissions from the Low-luminosity AGN NGC 4278 by LHAASO
Author(s)
Cao Z.
Aharonian F.
Axikegu
Bai Y.X.
Bao Y.W.
Bastieri D.
Bi X.J.
Bi Y.J.
Bian W.
Bukevich A.V.
Cao Q.
Cao W.Y.
Cao Z.
Chang J.
Chang J.F.
Chen A.M.
Chen E.S.
Chen H.X.
Chen L.
Chen L.
Chen L.
Chen M.J.
Chen M.L.
Chen Q.H.
Chen S.
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.
Danzengluobu
Dong X.Q.
Duan K.K.
Fan J.H.
Fan Y.Z.
Fang J.
Fang J.H.
Fang K.
Feng C.F.
Feng H.
Feng L.
Feng S.H.
Feng X.T.
Feng Y.
Feng Y.L.
Gabici S.
Gao B.
Gao C.D.
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.
Hasan M.
He H.H.
He H.N.
He J.Y.
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.
Ji X.L.
Jia H.Y.
Jia K.
Jiang K.
Jiang X.W.
Jiang Z.J.
Jin M.
Kang M.M.
Karpikov I.
Kuleshov D.
Kurinov K.
Li B.B.
Aharonian F.
Axikegu
Bai Y.X.
Bao Y.W.
Bastieri D.
Bi X.J.
Bi Y.J.
Bian W.
Bukevich A.V.
Cao Q.
Cao W.Y.
Cao Z.
Chang J.
Chang J.F.
Chen A.M.
Chen E.S.
Chen H.X.
Chen L.
Chen L.
Chen L.
Chen M.J.
Chen M.L.
Chen Q.H.
Chen S.
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.
Danzengluobu
Dong X.Q.
Duan K.K.
Fan J.H.
Fan Y.Z.
Fang J.
Fang J.H.
Fang K.
Feng C.F.
Feng H.
Feng L.
Feng S.H.
Feng X.T.
Feng Y.
Feng Y.L.
Gabici S.
Gao B.
Gao C.D.
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.
Hasan M.
He H.H.
He H.N.
He J.Y.
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.
Ji X.L.
Jia H.Y.
Jia K.
Jiang K.
Jiang X.W.
Jiang Z.J.
Jin M.
Kang M.M.
Karpikov I.
Kuleshov D.
Kurinov K.
Li B.B.
Author's Affiliation
Zhejiang Lab
State Key Laboratory of Particle Detection & Electronics
Université Paris Cité
Yunnan Observatories
Nanjing University
Shanghai Astronomical Observatory Chinese Academy of Sciences
Institute for Nuclear Research of the Russian Academy of Sciences
Shandong University
Yunnan University
Institute of High Energy Physics, Chinese Academy of Sciences
University of Chinese Academy of Sciences
Guangzhou University
Tsinghua University
Shanghai Jiao Tong University
Sun Yat-Sen University
University of Science and Technology of China
Zhengzhou University
Institiúid Ard-Lénn Bhaile Átha Cliath
Sichuan University
National Astronomical Observatories Chinese Academy of Sciences
Max-Planck-Institut für Kernphysik
Southwest Jiaotong University
China Center of Advanced Science and Technology World Laboratory
Purple Mountain Observatory Chinese Academy of Sciences
Hebei Normal University
Tibet University
TIANFU Cosmic Ray Research Center
State Key Laboratory of Particle Detection & Electronics
Université Paris Cité
Yunnan Observatories
Nanjing University
Shanghai Astronomical Observatory Chinese Academy of Sciences
Institute for Nuclear Research of the Russian Academy of Sciences
Shandong University
Yunnan University
Institute of High Energy Physics, Chinese Academy of Sciences
University of Chinese Academy of Sciences
Guangzhou University
Tsinghua University
Shanghai Jiao Tong University
Sun Yat-Sen University
University of Science and Technology of China
Zhengzhou University
Institiúid Ard-Lénn Bhaile Átha Cliath
Sichuan University
National Astronomical Observatories Chinese Academy of Sciences
Max-Planck-Institut für Kernphysik
Southwest Jiaotong University
China Center of Advanced Science and Technology World Laboratory
Purple Mountain Observatory Chinese Academy of Sciences
Hebei Normal University
Tibet University
TIANFU Cosmic Ray Research Center
Corresponding Author(s)
Other Contributor(s)
Abstract
The first source catalog of the Large High Altitude Air Shower Observatory (LHAASO) reported the detection of a very high energy gamma-ray source, 1LHAASO J1219+2915. This Letter presents a further detailed study of the spectral and temporal behavior of this pointlike source. The best-fit position of the TeV source (R.A. = 185.°05 ± 0.°04, decl. = 29.°25 ± 0.°03) is compatible with NGC 4278 within ∼0.°03. Variation analysis shows an indication of variability on a timescale of a few months in the TeV band, which is consistent with low-frequency observations. Based on these observations, we report the detection of TeV γ-ray emissions from this low-luminosity active galactic nucleus. The observation by LHAASO's Water Cherenkov Detector Array during the active period has a significance level of 8.8σ with a best-fit photon spectral index Γ = 2.56 ± 0.14 and a flux f1-10 TeV = (7.0 ± 1.1sta ± 0.35syst) × 10−13 photons cm−2 s−1, or approximately 5% of the Crab Nebula. The discovery of VHE gamma-ray emission from NGC 4278 indicates that compact, weak radio jets can efficiently accelerate particles and emit TeV photons.