Study of ultra-high-energy gamma-ray source 1LHAASO J0056+6346u and its possible origins

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.; Chang J.; Chang J.F.; Chen A.M.; Chen E.S.; Chen H.X.; 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.; Chu M.C.; 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.; Ge T.T.; Geng L.S.; Giacinti G.; Gong G.H.; Gou Q.B.; Gu M.H.; Guo F.L.; Guo J.; Guo X.L.; Guo Y.Q.; Guo Y.Y.; Han Y.A.; Hannuksela O.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 C.; Huang D.H.; Huang T.Q.; Huang W.J.; Huang X.T.; Huang X.Y.; Huang Y.; Huang Y.Y.; Ji X.L.; Jia H.Y.; Jia K.; Jiang H.B.; Jiang K.; Jiang X.W.

Study of ultra-high-energy gamma-ray source 1LHAASO J0056+6346u and its possible origins

Issued Date

2025-07-01

Resource Type

Article

ISSN

16747348

eISSN

18691927

DOI

10.1007/s11433-024-2661-8

Scopus ID

2-s2.0-105007106152

Journal Title

Science China Physics Mechanics and Astronomy

Volume

68

Issue

7

Rights Holder(s)

SCOPUS

Bibliographic Citation

Science China Physics Mechanics and Astronomy Vol.68 No.7 (2025)

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., Chu M.C., 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., Ge T.T., Geng L.S., Giacinti G., Gong G.H., Gou Q.B., Gu M.H., Guo F.L., Guo J., Guo X.L., Guo Y.Q., Guo Y.Y., Han Y.A., Hannuksela O.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 C., Huang D.H., Huang T.Q., Huang W.J., Huang X.T., Huang X.Y., Huang Y., Huang Y.Y., Ji X.L., Jia H.Y., Jia K., Jiang H.B., Jiang K., Jiang X.W. Study of ultra-high-energy gamma-ray source 1LHAASO J0056+6346u and its possible origins. Science China Physics Mechanics and Astronomy Vol.68 No.7 (2025). doi:10.1007/s11433-024-2661-8 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/110570

Title

Study of ultra-high-energy gamma-ray source 1LHAASO J0056+6346u and its possible origins

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.
Chu M.C.
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.
Ge T.T.
Geng L.S.
Giacinti G.
Gong G.H.
Gou Q.B.
Gu M.H.
Guo F.L.
Guo J.
Guo X.L.
Guo Y.Q.
Guo Y.Y.
Han Y.A.
Hannuksela O.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 C.
Huang D.H.
Huang T.Q.
Huang W.J.
Huang X.T.
Huang X.Y.
Huang Y.
Huang Y.Y.
Ji X.L.
Jia H.Y.
Jia K.
Jiang H.B.
Jiang K.
Jiang X.W.

Author's Affiliation

TIANFU Cosmic Ray Research Center
Institiúid Ard-Lénn Bhaile Átha Cliath
Zhejiang Lab
China Center of Advanced Science and Technology World Laboratory
Zhengzhou University
University of Chinese Academy of Sciences
Institute for Nuclear Research of the Russian Academy of Sciences
Shanghai Jiao Tong University
Shandong University
Purple Mountain Observatory Chinese Academy of Sciences
State Key Laboratory of Particle Detection & Electronics
Yunnan University
Guangzhou University
Max-Planck-Institut für Kernphysik
Sun Yat-Sen University
Nanjing University
Tsinghua University
Yunnan Observatories
National Astronomical Observatories Chinese Academy of Sciences
University of Science and Technology of China
Université Paris Cité
Southwest Jiaotong University
Shanghai Astronomical Observatory Chinese Academy of Sciences
Institute of High Energy Physics, Chinese Academy of Sciences
Hebei Normal University
Chinese University of Hong Kong
Tibet University

Corresponding Author(s)

Cao Z.

Other Contributor(s)

Mahidol University

Abstract

We report a dedicated study of the newly discovered extended UHE γ-ray source 1LHAASO J0056+6346u. Analyzing 979 d of LHAASO-WCDA data and 1389 d of LHAASO-KM2A data, we observed a significant excess of γ-ray events with both WCDA and KM2A. Assuming a point power-law source with a fixed spectral index, the significance maps reveal excesses of 12.65 σ, 22.18 σ, and 10.24 σ in the energy ranges of 1–25, 25–100, and >100 TeV, respectively. We use a 3D likelihood algorithm to derive the morphological and spectral parameters, and the source is detected with significances of 13.72 σ by WCDA and 25.27 σ by KM2A. The best-fit positions derived from WCDA and KM2A data are (R.A. = 13.96° ± 0.09°, Decl. = 63.92° ± 0.05°) and (R.A. = 14.00° ± 0.05°, Decl. = 63.79° ± 0.02°), respectively. The angular size (r<inf>39</inf>) of 1LHAASO J0056+6346u is 0.34° ± 0.04° at 1–25 TeV and 0.24° ± 0.02° at >25 TeV. The differential flux of this UHE γ-ray source can be described by an exponential cutoff power-law function: (2.67 ± 0.25) × 10−15 (E/20 TeV)(−1.97±0.10) e−E/(55.1±7.2) TeV TeV−1 cm−2 s−1. To explore potential sources of γ-ray emission, we investigated the gas distribution around 1LHAASO J0056+6346u. 1LHAASO J0056+6346u is likely to be a TeV PWN powered by an unknown pulsar, which would naturally explain both its spatial and spectral properties. Another explanation is that this UHE γ-ray source might be associated with gas content illuminated by a nearby CR accelerator, possibly the SNR candidate G124.0+1.4.

Keyword(s)

Physics and Astronomy

URI

https://repository.li.mahidol.ac.th/handle/123456789/110570

Collections

Scopus 2025

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