Discovery of Very High Energy Gamma-Ray Emissions from the Low-luminosity AGN NGC 4278 by LHAASO

The Astrophysical Journal Letters Pub Date : 2024-08-19 DOI:10.3847/2041-8213/ad5e6d

Zhen Cao, F. Aharonian, Axikegu, Y. X. Bai, Y. W. Bao, D. Bastieri, X. J. Bi, Y. J. Bi, W. Bian, A. V. Bukevich, Q. Cao, W. Y. Cao, Zhe Cao, J. Chang, J. F. Chang, A. M. Chen, E. S. Chen, H. X. Chen, Liang 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. Chen, N. Cheng, Y. D. Cheng, M. Y. Cui, S. W. Cui, X. H. Cui, Y. D. Cui, B. Z. Dai, H. L. Dai, Z. G. Dai, Danzengluobu, X. Q. Dong, K. K. Duan, J. H. Fan, Y. Z. Fan, J. Fang, J. H. Fang, K. Fang, C. F. Feng, H. Feng, L. Feng, S. H. Feng, X. T. Feng, Y. Feng, Y. L. Feng, S. Gabici, B. Gao, C. D. Gao, Q. Gao, W. Gao, W. K. Gao, M. M. Ge, L. S. Geng, G. Giacinti, G. H. Gong, Q. B. Gou, M. H. Gu, F. L. Guo, X. L. Guo, Y. Q. Guo, Y. Y. Guo, Y. A. Han, M. Hasan, H. H. He, H. N. He, J. Y. He, Y. He, Y. K. Hor, B. W. Hou, C. Hou, X. Hou, H. B. Hu, Q. Hu, S. C. Hu, D. H. Huang, T. Q. Huang, W. J. Huang, X. T. Huang, X. Y. Huang, Y. Huang, X. L. Ji, H. Y. Jia, K. Jia, K. Jia..

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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.

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利用 LHAASO 发现低亮度 AGN NGC 4278 的超高能量伽马射线发射

大型高空气流淋浴天文台（LHAASO）的第一份源目录报告探测到了一个能量非常高的伽马射线源，1LHAASO J1219+2915。这封信介绍了对这个点状源的光谱和时间行为的进一步详细研究。TeV源的最佳拟合位置（R.A. = 185.°05 ± 0.°04, decl. = 29.°25 ± 0.°03）与NGC 4278相吻合，误差在0.°03以内。变异分析表明，在 TeV 波段上存在几个月的变异，这与低频观测结果一致。根据这些观测结果，我们报告了从这个低照度活动星系核中探测到的 TeV γ 射线辐射。LHAASO的水切伦科夫探测器阵列在活动期间的观测结果的显著性水平为8.8σ，最佳拟合光子光谱指数Γ = 2.56 ± 0.14，通量f1-10 TeV = (7.0 ± 1.1sta ± 0.35syst)×10-13光子cm-2 s-1，约为蟹状星云的5%。NGC 4278的VHE伽马射线发射的发现表明，紧凑而微弱的射电喷流可以有效地加速粒子并发射TeV光子。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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The Astrophysical Journal Letters

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