Discovery of Very High Energy Gamma-Ray Emissions from the Low-luminosity AGN NGC 4278 by LHAASO
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Published:2024-08-01
Issue:2
Volume:971
Page:L45
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ISSN:2041-8205
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Container-title:The Astrophysical Journal Letters
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language:
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Short-container-title:ApJL
Author:
Cao Zhen, Aharonian F.ORCID, 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 Zhe, Chang J., Chang J. F., Chen A. M., Chen E. S., Chen H. X., Chen LiangORCID, Chen Lin, Chen Long, 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.ORCID, 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., Li C. M., Li Cheng, Li Cong, Li D., Li F., Li H. B., Li H. C., Li Jian, Li Jie, Li K., Li S. D., Li W. L., Li W. L., Li X. R., Li Xin, Li Y. Z., Li Zhe, Li Zhuo, Liang E. W., Liang Y. F., Lin S. J., Liu B., Liu C., Liu D., Liu D. B., Liu H., Liu H. D., Liu J., Liu J. L., Liu M. Y., Liu R. Y., Liu S. M., Liu W., Liu Y., Liu Y. N., Luo Q., Luo Y., 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 L. J., Pattarakijwanich P., Pei Z. Y., Qi J. C., Qi M. Y., Qiao B. Q., Qin J. J., Raza A., Ruffolo D., Sáiz A., Saeed M., Semikoz D., Shao L., Shchegolev O., Sheng X. D., Shu F. W., Song H. C., Stenkin Yu. V., Stepanov V., Su Y., Sun D. X., Sun Q. N., Sun X. N., Sun Z. B., Takata J., Tam P. H. T., Tang Q. W., Tang R., Tang Z. B., Tian W. W., Wang C., Wang C. B., Wang G. W., Wang H. G., Wang H. H., Wang J. C., Wang Kai, Wang Kai, 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 Zhen, Wang Zheng, Wei D. M., Wei J. J., Wei Y. J., Wen T., Wu C. Y., Wu H. R., Wu Q. W., Wu S., Wu X. F., Wu Y. S., Xi S. Q., Xia J., Xiang G. M., Xiao D. X., Xiao G., Xin Y. L., Xing Y., Xiong D. R., 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 C. Y., Yang F., Yang F. F., Yang L. L., Yang M. J., Yang R. Z., Yang W. X., Yao Y. H., Yao Z. G., 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., Zhang H. M., Zhang H. Y., Zhang J. L., Zhang Li, Zhang 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 Yi, Zhang YongORCID, Zhao B., Zhao J., Zhao L., Zhao L. Z., Zhao S. P., Zhao X. H., Zheng F., Zhong W. J., Zhou B., Zhou H., Zhou J. N., Zhou M., Zhou P., Zhou R., Zhou X. X., Zhou X. X., Zhu B. Y., Zhu C. G., Zhu F. R., Zhu H., Zhu K. J., Zou Y. C., Zuo X.,
Abstract
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 f
1–10 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.
Funder
MOST ∣ National Natural Science Foundation of China National Science and Technology Development Agency National Research Council of Thailand The Department of Science and Technology of Sichuan Province, China Shanghai Pilot Program for Basic Research, Chinese Academy of Science, Shanghai Branc
Publisher
American Astronomical Society
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