Evidence for particle acceleration approaching PeV energies in the W51 complex

LHASSO Collaboration; Cao, Zhen; Aharonian, F.; Axikegu ,; Y. X., Bai; 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, 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.; 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 ,; X. Q., Dong; 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.; 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, Yong; 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.

doi:10.1016/j.scib.2024.07.017

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Evidence for particle acceleration approaching PeV energies in the W51 complex

LHASSO Collaboration, Cao, Z., Aharonian, F., Axikegu, Y. X., B., Bao, Y., et al. (2024). Evidence for particle acceleration approaching PeV energies in the W51 complex. Science Bulletin, 69(18), 2833-2841. doi:10.1016/j.scib.2024.07.017.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000F-DBB4-F Version Permalink: https://hdl.handle.net/21.11116/0000-000F-DBB5-E

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https://www.sciencedirect.com/science/article/pii/S2095927324004961?via%3Dihub (Publisher version) Open Access Hybrid

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https://arxiv.org/pdf/2407.00624 (Preprint) Open Access Green

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Creators:
LHASSO Collaboration, Author
Cao, Zhen, Author
Aharonian, F.¹, Author
Axikegu , Author
Y. X., Bai, Author
Bao, Y. W., Author
Bastieri, D., Author
Bi, X. J., Author
Bi, Y. J., Author
Bian, W., Author
Bukevich, A. V., Author
Cao, Q., Author
Cao, W. Y., Author
Cao, Zhe, Author
Chang, J., Author
Chang, J. F., Author
Chen, A. M., Author
Chen, E. S., Author
Chen, H. X., Author
Chen, Liang, Author
Chen, Lin, AuthorChen, Long, AuthorChen, M. J., AuthorChen, M. L., AuthorChen, Q. H., AuthorChen, S., AuthorChen, S. H., AuthorChen, S. Z., AuthorChen, T. L., AuthorChen, Y., AuthorCheng, N., AuthorCheng, Y. D., AuthorCui, M. Y., AuthorCui, S. W., AuthorCui, X. H., AuthorCui, Y. D., AuthorDai, B. Z., AuthorDai, H. L., AuthorDai, Z. G., AuthorDanzengluobu , AuthorX. Q., Dong, AuthorDuan, K. K., AuthorFan, J. H., AuthorFan, Y. Z., AuthorFang, J., AuthorFang, J. H., AuthorFang, K., AuthorFeng, C. F., AuthorFeng, H., AuthorFeng, L., AuthorFeng, S. H., AuthorFeng, X. T., AuthorFeng, Y., AuthorFeng, Y. L., AuthorGabici, S., AuthorGao, B., AuthorGao, C. D., AuthorGao, Q., AuthorGao, W., AuthorGao, W. K., AuthorGe, M. M., AuthorGeng, L. S., AuthorGiacinti, G., AuthorGong, G. H., AuthorGou, Q. B., AuthorGu, M. H., AuthorGuo, F. L., AuthorGuo, X. L., AuthorGuo, Y. Q., AuthorGuo, Y. Y., AuthorHan, Y. A., AuthorHasan, M., AuthorHe, H. H., AuthorHe, H. N., AuthorHe, J. Y., AuthorHe, Y., AuthorHor, Y. K., AuthorHou, B. W., AuthorHou, C., AuthorHou, X., AuthorHu, H. B., AuthorHu, Q., AuthorHu, S. C., AuthorHuang, D. H., AuthorHuang, T. Q., AuthorHuang, W. J., AuthorHuang, X. T., AuthorHuang, X. Y., AuthorHuang, Y., AuthorJi, X. L., AuthorJia, H. Y., AuthorJia, K., AuthorJiang, K., AuthorJiang, X. W., AuthorJiang, Z. J., AuthorJin, M., AuthorKang, M. M., AuthorKarpikov, I., AuthorKuleshov, D., AuthorKurinov, K., AuthorLi, B. B., AuthorLi, C. M., AuthorLi, Cheng, AuthorLi, Cong, AuthorLi, D., AuthorLi, F., AuthorLi, H. B., AuthorLi, H. C., AuthorLi, Jian, AuthorLi, Jie, AuthorLi, K., AuthorLi, S. D., AuthorLi, W. L., AuthorLi, W. L., AuthorLi, X. R., AuthorLi, Xin, AuthorLi, Y. Z., AuthorLi, Zhe, AuthorLi, Zhuo, AuthorLiang, E. W., AuthorLiang, Y. F., AuthorLin, S. J., AuthorLiu, B., AuthorLiu, C., AuthorLiu, D., AuthorLiu, D. B., AuthorLiu, H., AuthorLiu, H. D., AuthorLiu, J., AuthorLiu, J. L., AuthorLiu, M. Y., AuthorLiu, R. Y., AuthorLiu, S. M., AuthorLiu, W., AuthorLiu, Y., AuthorLiu, Y. N., AuthorLuo, Q., AuthorLuo, Y., AuthorLv, H. K., AuthorMa, B. Q., AuthorMa, L. L., AuthorMa, X. H., AuthorMao, J. R., AuthorMin, Z., AuthorMitthumsiri, W., AuthorMu, H. J., AuthorNan, Y. C., AuthorNeronov, A., AuthorOu, L. J., AuthorPattarakijwanich, P., AuthorPei, Z. Y., AuthorQi, J. C., AuthorQi, M. Y., AuthorQiao, B. Q., AuthorQin, J. J., AuthorRaza, A., AuthorRuffolo, D., AuthorSáiz, A., AuthorSaeed, M., AuthorSemikoz, D., AuthorShao, L., AuthorShchegolev, O., AuthorSheng, X. D., AuthorShu, F. W., AuthorSong, H. C., AuthorStenkin, Yu. V., AuthorStepanov, V., AuthorSu, Y., AuthorSun, D. X., AuthorSun, Q. N., AuthorSun, X. N., AuthorSun, Z. B., AuthorTakata, J., AuthorTam, P. H. T., AuthorTang, Q. W., AuthorTang, R., AuthorTang, Z. B., AuthorTian, W. W., AuthorWang, C., AuthorWang, C. B., AuthorWang, G. W., AuthorWang, H. G., AuthorWang, H. H., AuthorWang, J. C., AuthorWang, Kai, AuthorWang, Kai, AuthorWang, L. P., AuthorWang, L. Y., AuthorWang, P. H., AuthorWang, R., AuthorWang, W., AuthorWang, X. G., AuthorWang, X. Y., AuthorWang, Y., AuthorWang, Y. D., AuthorWang, Y. J., AuthorWang, Z. H., AuthorWang, Z. X., AuthorWang, Zhen, AuthorWang, Zheng, AuthorWei, D. M., AuthorWei, J. J., AuthorWei, Y. J., AuthorWen, T., AuthorWu, C. Y., AuthorWu, H. R., AuthorWu, Q. W., AuthorWu, S., AuthorWu, X. F., AuthorWu, Y. S., AuthorXi, S. Q., AuthorXia, J., AuthorXiang, G. M., AuthorXiao, D. X., AuthorXiao, G., AuthorXin, Y. L., AuthorXing, Y., AuthorXiong, D. R., AuthorXiong, Z., AuthorXu, D. L., AuthorXu, R. F., AuthorXu, R. X., AuthorXu, W. L., AuthorXue, L., AuthorYan, D. H., AuthorYan, J. Z., AuthorYan, T., AuthorYang, C. W., AuthorYang, C. Y., AuthorYang, F., AuthorYang, F. F., AuthorYang, L. L., AuthorYang, M. J., AuthorYang, R. Z., AuthorYang, W. X., AuthorYao, Y. H., AuthorYao, Z. G., AuthorYin, L. Q., AuthorYin, N., AuthorYou, X. H., AuthorYou, Z. Y., AuthorYu, Y. H., AuthorYuan, Q., AuthorYue, H., AuthorZeng, H. D., AuthorZeng, T. X., AuthorZeng, W., AuthorZha, M., AuthorZhang, B. B., AuthorZhang, F., AuthorZhang, H., AuthorZhang, H. M., AuthorZhang, H. Y., AuthorZhang, J. L., AuthorZhang, Li, AuthorZhang, P. F., AuthorZhang, P. P., AuthorZhang, R., AuthorZhang, S. B., AuthorZhang, S. R., AuthorZhang, S. S., AuthorZhang, X., AuthorZhang, X. P., AuthorZhang, Y. F., AuthorZhang, Yi, AuthorZhang, Yong, AuthorZhao, B., AuthorZhao, J., AuthorZhao, L., AuthorZhao, L. Z., AuthorZhao, S. P., AuthorZhao, X. H., AuthorZheng, F., AuthorZhong, W. J., AuthorZhou, B., AuthorZhou, H., AuthorZhou, J. N., AuthorZhou, M., AuthorZhou, P., AuthorZhou, R., AuthorZhou, X. X., AuthorZhou, X. X., AuthorZhu, B. Y., AuthorZhu, C. G., AuthorZhu, F. R., AuthorZhu, H., AuthorZhu, K. J., AuthorZou, Y. C., AuthorZuo, X., Author more..

Affiliations:
1Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society, ou_2074298

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Free keywords: UHE, y-ray, Cosmic rays, SNR W51C, Star clusters

Abstract: The y-ray emission from the W51 complex is widely acknowledged to be attributed to the interaction between the cosmic rays (CRs) accelerated by the shock of supernova remnant (SNR) W51C and the dense molecular clouds in the adjacent star-forming region, W51B. However, the maximum acceleration capability of W51C for CRs remains elusive. Based on observations conducted with the Large High Altitude Air Shower Observatory (LHAASO), we report a significant detection of y rays emanating from the W51 complex, with energies from 2 to 200 TeV. The LHAASO measurements, for the first time, extend the y-ray emission from the W51 complex beyond 100 TeV and reveal a significant spectrum bending at tens of TeV. By combining the "π⁰ -decay bump" featured data from Fermi-LAT, the broadband y-ray spectrum of the W51 region can be well-characterized by a simple pp-collision model. The observed spectral bending feature suggests an exponential cutoff at 400 TeV or a power-law break at 200 TeV in the CR proton spectrum, most likely providing the first evidence of SNRs serving as CR accelerators approaching the PeV regime. Additionally, two young star clusters within W51B could also be theoretically viable to produce the most energetic y rays observed by LHAASO. Our findings strongly support the presence of extreme CR accelerators within the W51 complex and provide new insights into the origin of Galactic CRs.

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Dates: Published Online: 2024-07-16

Publication Status: Published online

Pages: 9

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Identifiers: DOI: 10.1016/j.scib.2024.07.017

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Title: Science Bulletin

Abbreviation : Sci. Bull.

Source Genre: Journal

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Publ. Info: Elsevier B.V.

Pages: - Volume / Issue: 69 (18) Sequence Number: - Start / End Page: 2833 - 2841 Identifier: ISSN: 2095-9273
CoNE: https://pure.mpg.de/cone/journals/resource/2095-9273