Broadband γ-Ray Spectrum of Supernova Remnant Cassiopeia A

Zhen Cao; F. Aharonian; Y. X. Bai; Y. W. Bao; D. Bastieri; X. J. Bi; Y. J. Bi; W. Bian; A. V. Bukevich; C. M. Cai; W. Y. Cao; Zhe Cao; J. Chang; J. F. Chang; A. M. Chen; E. S. Chen; H. X. Chen; Liang Chen; Long Chen; M. J. Chen; M. L. Chen; Q. H. Chen; S. Chen; S. H. Chen; S. Z. Chen; T. L. Chen; X. B. Chen; X. J. Chen; Y. Chen; N. Cheng; Y. D. Cheng; M. C. Chu; M. Y. Cui; S. W. Cui; X. H. Cui; Y. D. Cui; B. Z. Dai; H. L. Dai; Z. G. Dai; Danzengluobu; Y. X. Diao; 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; T. T. Ge; L. S. Geng; G. Giacinti; G. H. Gong; Q. B. Gou; M. H. Gu; F. L. Guo; J. Guo; X. L. Guo; Y. Q. Guo; Y. Y. Guo; Y. A. Han; O. A. Hannuksela; M. Hasan; H. H. He; H. N. He; J. Y. He; X. Y. He; Y. He; S. Hern ndez-Cadena; Y. K. Hor; B. W. Hou; C. Hou; X. Hou; H. B. Hu; S. C. Hu; C. Huang; D. H. Huang; J. J. Huang; T. Q. Huang; W. J. Huang; X. T. Huang; X. Y. Huang; Y. Huang; Y. Y. Huang; X. L. Ji; H. Y. Jia; K. Jia; H. B. Jiang; K. Jiang; X. W. Jiang; Z. J. Jiang; M. Jin; S. Kaci; M. M. Kang; I. Karpikov; D. Khangulyan; D. Kuleshov; K. Kurinov; B. B. Li; Cheng Li; Cong Li; D. Li; F. Li; H. B. Li; H. C. Li; Jian Li; Jie Li; K. Li; L. Li; R. L. Li; S. D. Li; T. Y. Li; W. L. Li; X. R. Li; Xin Li; Y. Z. Li; Zhe Li; Zhuo Li; E. W. Liang; Y. F. Liang; S. J. Lin; B. Liu; C. Liu; D. Liu; D. B. Liu; H. Liu; H. D. Liu; J. Liu; J. L. Liu; J. R. Liu; M. Y. Liu; R. Y. Liu; S. M. Liu; W. Liu; X. Liu; Y. Liu; Y. Liu; Y. N. Liu; Y. Q. Lou; Q. Luo; Y. Luo; H. K. Lv; B. Q. Ma; L. L. Ma; X. H. Ma; J. R. Mao; Z. Min; W. Mitthumsiri; G. B. Mou; H. J. Mu; Y. C. Nan; A. Neronov; K. C.Y. Ng; M. Y. Ni; L. Nie; L. J. Ou; P. Pattarakijwanich; Z. Y. Pei; J. C. Qi; M. Y. Qi; J. J. Qin; A. Raza; C. Y. Ren; D. Ruffolo; A. Sáiz; M. Saeed; D. Semikoz; L. Shao; O. Shchegolev; Y. Z. Shen; X. D. Sheng; Z. D. Shi; F. W. Shu; H. C. Song; Yu V. Stenkin; V. Stepanov; Y. Su; D. X. Sun; H. Sun; Q. N. Sun; X. N. Sun; Z. B. Sun; N. H. Tabasam; J. Takata; P. H.T. Tam; H. B. Tan; Q. W. Tang; R. Tang; Z. B. Tang; W. W. Tian; C. N. Tong; L. H. Wan; C. Wang; G. W. Wang; H. G. Wang; H. H. Wang; J. C. Wang; K. Wang; Kai Wang; Kai Wang; L. P. Wang; L. Y. Wang; L. Y. Wang; R. Wang; W. Wang; X. G. Wang; X. J. Wang; X. Y. Wang; Y. Wang; Y. D. Wang; Z. H. Wang; Z. X. Wang; Zheng Wang; D. M. Wei; J. J. Wei; Y. J. Wei; T. Wen; S. S. Weng; C. Y. Wu; H. R. Wu; Q. W. Wu; S. Wu; X. F. Wu; Y. S. Wu; S. Q. Xi; J. Xia; J. J. Xia; G. M. Xiang; D. X. Xiao; G. Xiao; Y. L. Xin; Y. Xing; D. R. Xiong; Z. Xiong; D. L. Xu; R. F. Xu; R. X. Xu; W. L. Xu; L. Xue; D. H. Yan; J. Z. Yan; T. Yan; C. W. Yang; C. Y. Yang; F. F. Yang; L. L. Yang; M. J. Yang; R. Z. Yang; W. X. Yang; Y. H. Yao; Z. G. Yao; X. A. Ye; L. Q. Yin; N. Yin; X. H. You; Z. Y. You; Y. H. Yu; Q. Yuan; H. Yue; H. D. Zeng; T. X. Zeng; W. Zeng; M. Zha; B. B. Zhang; B. T. 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. R. Zhang; S. S. Zhang; W. Y. Zhang; X. Zhang; X. P. Zhang; Yi Zhang; Yong Zhang; Z. P. Zhang; J. Zhao; L. Zhao; L. Z. Zhao; S. P. Zhao; X. H. Zhao; Z. H. Zhao; F. Zheng; W. J. Zhong; B. Zhou; H. Zhou; J. N. Zhou; M. Zhou; P. Zhou; R. Zhou; X. X. Zhou; X. X. Zhou; B. Y. Zhu; C. G. Zhu; F. R. Zhu; H. Zhu; K. J. Zhu; Y. C. Zou; X. Zuo

doi:10.3847/2041-8213/adb97c

Broadband γ-Ray Spectrum of Supernova Remnant Cassiopeia A

Zhen Cao
, F. Aharonian
, Y. X. Bai
, Y. W. Bao
, D. Bastieri
, X. J. Bi
, Y. J. Bi
, W. Bian
, A. V. Bukevich
, C. M. Cai
, W. Y. Cao
, Zhe Cao
, J. Chang
, J. F. Chang
, A. M. Chen
, E. S. Chen
, H. X. Chen
, Liang Chen
, Long Chen
, M. J. Chen

M. L. Chen, Q. H. Chen, S. Chen, S. H. Chen, S. Z. Chen, T. L. Chen, X. B. Chen, X. J. Chen, Y. Chen, N. Cheng, Y. D. Cheng, M. C. Chu, M. Y. Cui, S. W. Cui, X. H. Cui, Y. D. Cui, B. Z. Dai, H. L. Dai, Z. G. Dai, Danzengluobu, Y. X. Diao, 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, T. T. Ge, L. S. Geng, G. Giacinti, G. H. Gong, Q. B. Gou, M. H. Gu, F. L. Guo, J. Guo, X. L. Guo, Y. Q. Guo, Y. Y. Guo, Y. A. Han, O. A. Hannuksela, M. Hasan, H. H. He, H. N. He, J. Y. He, X. Y. He, Y. He, S. Hern ndez-Cadena, Y. K. Hor, B. W. Hou, C. Hou, X. Hou, H. B. Hu, S. C. Hu, C. Huang, D. H. Huang, J. J. Huang, T. Q. Huang, W. J. Huang, X. T. Huang, X. Y. Huang, Y. Huang, Y. Y. Huang, X. L. Ji, H. Y. Jia, K. Jia, H. B. Jiang, K. Jiang, X. W. Jiang, Z. J. Jiang, M. Jin, S. Kaci, M. M. Kang, I. Karpikov, D. Khangulyan, D. Kuleshov, K. Kurinov, B. B. Li, Cheng Li, Cong Li, D. Li, F. Li, H. B. Li, H. C. Li, Jian Li, Jie Li, K. Li, L. Li, R. L. Li, S. D. Li, T. Y. Li, W. L. Li, X. R. Li, Xin Li, Y. Z. Li, Zhe Li, Zhuo Li, E. W. Liang, Y. F. Liang, S. J. Lin, B. Liu, C. Liu, D. Liu, D. B. Liu, H. Liu, H. D. Liu, J. Liu, J. L. Liu, J. R. Liu, M. Y. Liu, R. Y. Liu, S. M. Liu, W. Liu, X. Liu, Y. Liu, Y. Liu, Y. N. Liu, Y. Q. Lou, Q. Luo, Y. Luo, H. K. Lv, B. Q. Ma, L. L. Ma, X. H. Ma, J. R. Mao, Z. Min, W. Mitthumsiri, G. B. Mou, H. J. Mu, Y. C. Nan, A. Neronov, K. C.Y. Ng, M. Y. Ni, L. Nie, L. J. Ou, P. Pattarakijwanich, Z. Y. Pei, J. C. Qi, M. Y. Qi, J. J. Qin, A. Raza, C. Y. Ren, D. Ruffolo, A. Sáiz, M. Saeed, D. Semikoz, L. Shao, O. Shchegolev, Y. Z. Shen, X. D. Sheng, Z. D. Shi, F. W. Shu, H. C. Song, Yu V. Stenkin, V. Stepanov, Y. Su, D. X. Sun, H. Sun, Q. N. Sun, X. N. Sun, Z. B. Sun, N. H. Tabasam, J. Takata, P. H.T. Tam, H. B. Tan, Q. W. Tang, R. Tang, Z. B. Tang, W. W. Tian, C. N. Tong, L. H. Wan, C. Wang, G. W. Wang, H. G. Wang, H. H. Wang, J. C. Wang, K. Wang, Kai Wang, Kai Wang, L. P. Wang, L. Y. Wang, L. Y. Wang, R. Wang, W. Wang, X. G. Wang, X. J. Wang, X. Y. Wang, Y. Wang, Y. D. Wang, Z. H. Wang, Z. X. Wang, Zheng Wang, D. M. Wei, J. J. Wei, Y. J. Wei, T. Wen, S. S. Weng, C. Y. Wu, H. R. Wu, Q. W. Wu, S. Wu, X. F. Wu, Y. S. Wu, S. Q. Xi, J. Xia, J. J. Xia, G. M. Xiang, D. X. Xiao, G. Xiao, Y. L. Xin, Y. Xing, D. R. Xiong, Z. Xiong, D. L. Xu, R. F. Xu, R. X. Xu, W. L. Xu, L. Xue, D. H. Yan, J. Z. Yan, T. Yan, C. W. Yang, C. Y. Yang, F. F. Yang, L. L. Yang, M. J. Yang, R. Z. Yang, W. X. Yang, Y. H. Yao, Z. G. Yao, X. A. Ye, L. Q. Yin, N. Yin, X. H. You, Z. Y. You, Y. H. Yu, Q. Yuan, H. Yue, H. D. Zeng, T. X. Zeng, W. Zeng, M. Zha, B. B. Zhang, B. T. 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. R. Zhang, S. S. Zhang, W. Y. Zhang, X. Zhang, X. P. Zhang, Yi Zhang, Yong Zhang, Z. P. Zhang, J. Zhao, L. Zhao, L. Z. Zhao, S. P. Zhao, X. H. Zhao, Z. H. Zhao, F. Zheng, W. J. Zhong, B. Zhou, H. Zhou, J. N. Zhou, M. Zhou, P. Zhou, R. Zhou, X. X. Zhou, X. X. Zhou, B. Y. Zhu, C. G. Zhu, F. R. Zhu, H. Zhu, K. J. Zhu, Y. C. Zou, X. Zuo

CAS - Institute of High Energy Physics
University of Chinese Academy of Sciences
TIANFU Cosmic Ray Research Center
University of Science and Technology of China
Yerevan State University
Max Planck Institute for Nuclear Physics
Shanghai Jiao Tong University
Guangzhou University
Institute for Nuclear Research of the Russian Academy of Sciences
Southwest Jiaotong University
University of Science and Technology of China
CAS - Purple Mountain Observatory
Zhejiang Lab
CAS - Shanghai Astronomical Observatory
Yunnan University
Tibet University
Nanjing University
Chinese University of Hong Kong
Hebei Normal University
CAS - National Astronomical Observatories
Shandong University
Observatoire de Paris
Sun Yat-Sen University
Tsinghua University
Zhengzhou University
China Center of Advanced Science and Technology World Laboratory
Sichuan University
Nanchang University
Peking University
Guangxi University
Mahidol University
Nanjing Normal University
Moscow Institute of Physics and Technology
CAS - National Space Science Center
Huazhong University of Science and Technology

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The core-collapse supernova remnant (SNR) Cassiopeia A (Cas A) is one of the brightest galactic radio sources with an angular radius of ~2.5 ¢ . Although no extension of this source has been detected in the γ-ray band, using more than 1000 days of LHAASO data above ∼0.8 TeV, we find that its spectrum is significantly softer than those obtained with Imaging Air Cherenkov Telescopes (IACTs), and its flux near ∼1 TeV is about 2 times higher. In combination with analyses of more than 16 yr of Fermi-LAT data covering 0.1 GeV–1 TeV, we find that the spectrum above 30 GeV deviates significantly from a single power law and is best described by a smoothly broken power law with a spectral index of 1.90 ± 0.15_stat (3.41 ± 0.19_stat) below (above) a break energy of 0.63 ± 0.21_stat TeV. Given differences in the angular resolution of LHAASO-WCDA and IACTs, TeV γ-ray emission detected with LHAASO may have a significant contribution from regions surrounding the SNR illuminated by particles accelerated earlier, which, however, are treated as background by IACTs. Detailed modeling can be used to constrain the acceleration processes of TeV particles in the early stage of SNR evolution.

Original language	English
Article number	L33
Journal	Astrophysical Journal Letters
Volume	982
Issue number	1
DOIs	https://doi.org/10.3847/2041-8213/adb97c
State	Published - 20 Mar 2025
Externally published	Yes

Keywords

Gamma-ray astronomy (628)
Supernova remnants (1667)
Unified Astronomy Thesaurus concepts: High energy astrophysics (739)

Access to Document

10.3847/2041-8213/adb97c

Cite this

Cao, Z., Aharonian, F., Bai, Y. X., Bao, Y. W., Bastieri, D., Bi, X. J., Bi, Y. J., Bian, W., Bukevich, A. V., Cai, C. M., Cao, W. Y., Cao, Z., Chang, J., Chang, J. F., Chen, A. M., Chen, E. S., Chen, H. X., Chen, L., Chen, L., ... Zuo, X. (2025). Broadband γ-Ray Spectrum of Supernova Remnant Cassiopeia A. Astrophysical Journal Letters, 982(1), Article L33. https://doi.org/10.3847/2041-8213/adb97c

@article{a83f91a04d1a497598632a7fe9028303,

title = "Broadband γ-Ray Spectrum of Supernova Remnant Cassiopeia A",

abstract = "The core-collapse supernova remnant (SNR) Cassiopeia A (Cas A) is one of the brightest galactic radio sources with an angular radius of \textasciitilde{}2.5 ¢ . Although no extension of this source has been detected in the γ-ray band, using more than 1000 days of LHAASO data above ∼0.8 TeV, we find that its spectrum is significantly softer than those obtained with Imaging Air Cherenkov Telescopes (IACTs), and its flux near ∼1 TeV is about 2 times higher. In combination with analyses of more than 16 yr of Fermi-LAT data covering 0.1 GeV–1 TeV, we find that the spectrum above 30 GeV deviates significantly from a single power law and is best described by a smoothly broken power law with a spectral index of 1.90 ± 0.15stat (3.41 ± 0.19stat) below (above) a break energy of 0.63 ± 0.21stat TeV. Given differences in the angular resolution of LHAASO-WCDA and IACTs, TeV γ-ray emission detected with LHAASO may have a significant contribution from regions surrounding the SNR illuminated by particles accelerated earlier, which, however, are treated as background by IACTs. Detailed modeling can be used to constrain the acceleration processes of TeV particles in the early stage of SNR evolution.",

keywords = "Gamma-ray astronomy (628), Supernova remnants (1667), Unified Astronomy Thesaurus concepts: High energy astrophysics (739)",

author = "Zhen Cao and F. Aharonian and Bai, \{Y. X.\} and Bao, \{Y. W.\} and D. Bastieri and Bi, \{X. J.\} and Bi, \{Y. J.\} and W. Bian and Bukevich, \{A. V.\} and Cai, \{C. M.\} and Cao, \{W. Y.\} and Zhe Cao and J. Chang and Chang, \{J. F.\} and Chen, \{A. M.\} and Chen, \{E. S.\} and Chen, \{H. X.\} and Liang Chen and Long Chen and Chen, \{M. J.\} and Chen, \{M. L.\} and Chen, \{Q. H.\} and S. Chen and Chen, \{S. H.\} and Chen, \{S. Z.\} and Chen, \{T. L.\} and Chen, \{X. B.\} and Chen, \{X. J.\} and Y. Chen and N. Cheng and Cheng, \{Y. D.\} and Chu, \{M. C.\} and Cui, \{M. Y.\} and Cui, \{S. W.\} and Cui, \{X. H.\} and Cui, \{Y. D.\} and Dai, \{B. Z.\} and Dai, \{H. L.\} and Dai, \{Z. G.\} and Danzengluobu and Diao, \{Y. X.\} and Dong, \{X. Q.\} and Duan, \{K. K.\} and Fan, \{J. H.\} and Fan, \{Y. Z.\} and J. Fang and Fang, \{J. H.\} and K. Fang and Feng, \{C. F.\} and H. Feng and L. Feng and Feng, \{S. H.\} and Feng, \{X. T.\} and Y. Feng and Feng, \{Y. L.\} and S. Gabici and B. Gao and Gao, \{C. D.\} and Q. Gao and W. Gao and Gao, \{W. K.\} and Ge, \{M. M.\} and Ge, \{T. T.\} and Geng, \{L. S.\} and G. Giacinti and Gong, \{G. H.\} and Gou, \{Q. B.\} and Gu, \{M. H.\} and Guo, \{F. L.\} and J. Guo and Guo, \{X. L.\} and Guo, \{Y. Q.\} and Guo, \{Y. Y.\} and Han, \{Y. A.\} and Hannuksela, \{O. A.\} and M. Hasan and He, \{H. H.\} and He, \{H. N.\} and He, \{J. Y.\} and He, \{X. Y.\} and Y. He and ndez-Cadena, \{S. Hern\} and Hor, \{Y. K.\} and Hou, \{B. W.\} and C. Hou and X. Hou and Hu, \{H. B.\} and Hu, \{S. C.\} and C. Huang and Huang, \{D. H.\} and Huang, \{J. J.\} and Huang, \{T. Q.\} and Huang, \{W. J.\} and Huang, \{X. T.\} and Huang, \{X. Y.\} and Y. Huang and Huang, \{Y. Y.\} and Ji, \{X. L.\} and Jia, \{H. Y.\} and K. Jia and Jiang, \{H. B.\} and K. Jiang and Jiang, \{X. W.\} and Jiang, \{Z. J.\} and M. Jin and S. Kaci and Kang, \{M. M.\} and I. Karpikov and D. Khangulyan and D. Kuleshov and K. Kurinov and Li, \{B. B.\} and Cheng Li and Cong Li and D. Li and F. Li and Li, \{H. B.\} and Li, \{H. C.\} and Jian Li and Jie Li and K. Li and L. Li and Li, \{R. L.\} and Li, \{S. D.\} and Li, \{T. Y.\} and Li, \{W. L.\} and Li, \{X. R.\} and Xin Li and Li, \{Y. Z.\} and Zhe Li and Zhuo Li and Liang, \{E. W.\} and Liang, \{Y. F.\} and Lin, \{S. J.\} and B. Liu and C. Liu and D. Liu and Liu, \{D. B.\} and H. Liu and Liu, \{H. D.\} and J. Liu and Liu, \{J. L.\} and Liu, \{J. R.\} and Liu, \{M. Y.\} and Liu, \{R. Y.\} and Liu, \{S. M.\} and W. Liu and X. Liu and Y. Liu and Y. Liu and Liu, \{Y. N.\} and Lou, \{Y. Q.\} and Q. Luo and Y. Luo and Lv, \{H. K.\} and Ma, \{B. Q.\} and Ma, \{L. L.\} and Ma, \{X. H.\} and Mao, \{J. R.\} and Z. Min and W. Mitthumsiri and Mou, \{G. B.\} and Mu, \{H. J.\} and Nan, \{Y. C.\} and A. Neronov and Ng, \{K. C.Y.\} and Ni, \{M. Y.\} and L. Nie and Ou, \{L. J.\} and P. Pattarakijwanich and Pei, \{Z. Y.\} and Qi, \{J. C.\} and Qi, \{M. Y.\} and Qin, \{J. J.\} and A. Raza and Ren, \{C. Y.\} and D. Ruffolo and A. S{\'a}iz and M. Saeed and D. Semikoz and L. Shao and O. Shchegolev and Shen, \{Y. Z.\} and Sheng, \{X. D.\} and Shi, \{Z. D.\} and Shu, \{F. W.\} and Song, \{H. C.\} and Stenkin, \{Yu V.\} and V. Stepanov and Y. Su and Sun, \{D. X.\} and H. Sun and Sun, \{Q. N.\} and Sun, \{X. N.\} and Sun, \{Z. B.\} and Tabasam, \{N. H.\} and J. Takata and Tam, \{P. H.T.\} and Tan, \{H. B.\} and Tang, \{Q. W.\} and R. Tang and Tang, \{Z. B.\} and Tian, \{W. W.\} and Tong, \{C. N.\} and Wan, \{L. H.\} and C. Wang and Wang, \{G. W.\} and Wang, \{H. G.\} and Wang, \{H. H.\} and Wang, \{J. C.\} and K. Wang and Kai Wang and Kai Wang and Wang, \{L. P.\} and Wang, \{L. Y.\} and Wang, \{L. Y.\} and R. Wang and W. Wang and Wang, \{X. G.\} and Wang, \{X. J.\} and Wang, \{X. Y.\} and Y. Wang and Wang, \{Y. D.\} and Wang, \{Z. H.\} and Wang, \{Z. X.\} and Zheng Wang and Wei, \{D. M.\} and Wei, \{J. J.\} and Wei, \{Y. J.\} and T. Wen and Weng, \{S. S.\} and Wu, \{C. Y.\} and Wu, \{H. R.\} and Wu, \{Q. W.\} and S. Wu and Wu, \{X. F.\} and Wu, \{Y. S.\} and Xi, \{S. Q.\} and J. Xia and Xia, \{J. J.\} and Xiang, \{G. M.\} and Xiao, \{D. X.\} and G. Xiao and Xin, \{Y. L.\} and Y. Xing and Xiong, \{D. R.\} and Z. Xiong and Xu, \{D. L.\} and Xu, \{R. F.\} and Xu, \{R. X.\} and Xu, \{W. L.\} and L. Xue and Yan, \{D. H.\} and Yan, \{J. Z.\} and T. Yan and Yang, \{C. W.\} and Yang, \{C. Y.\} and Yang, \{F. F.\} and Yang, \{L. L.\} and Yang, \{M. J.\} and Yang, \{R. Z.\} and Yang, \{W. X.\} and Yao, \{Y. H.\} and Yao, \{Z. G.\} and Ye, \{X. A.\} and Yin, \{L. Q.\} and N. Yin and You, \{X. H.\} and You, \{Z. Y.\} and Yu, \{Y. H.\} and Q. Yuan and H. Yue and Zeng, \{H. D.\} and Zeng, \{T. X.\} and W. Zeng and M. Zha and Zhang, \{B. B.\} and Zhang, \{B. T.\} and F. Zhang and H. Zhang and Zhang, \{H. M.\} and Zhang, \{H. Y.\} and Zhang, \{J. L.\} and Li Zhang and Zhang, \{P. F.\} and Zhang, \{P. P.\} and R. Zhang and Zhang, \{S. R.\} and Zhang, \{S. S.\} and Zhang, \{W. Y.\} and X. Zhang and Zhang, \{X. P.\} and Yi Zhang and Yong Zhang and Zhang, \{Z. P.\} and J. Zhao and L. Zhao and Zhao, \{L. Z.\} and Zhao, \{S. P.\} and Zhao, \{X. H.\} and Zhao, \{Z. H.\} and F. Zheng and Zhong, \{W. J.\} and B. Zhou and H. Zhou and Zhou, \{J. N.\} and M. Zhou and P. Zhou and R. Zhou and Zhou, \{X. X.\} and Zhou, \{X. X.\} and Zhu, \{B. Y.\} and Zhu, \{C. G.\} and Zhu, \{F. R.\} and H. Zhu and Zhu, \{K. J.\} and Zou, \{Y. C.\} and X. Zuo",

year = "2025",

month = mar,

day = "20",

doi = "10.3847/2041-8213/adb97c",

language = "英语",

volume = "982",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "1",

}

Cao, Z, Aharonian, F, Bai, YX, Bao, YW, Bastieri, D, Bi, XJ, Bi, YJ, Bian, W, Bukevich, AV, Cai, CM, Cao, WY, Cao, Z, Chang, J, Chang, JF, Chen, AM, Chen, ES, Chen, HX, Chen, L, Chen, L, Chen, MJ, Chen, ML, Chen, QH, Chen, S, Chen, SH, Chen, SZ, Chen, TL, Chen, XB, Chen, XJ, Chen, Y, Cheng, N, Cheng, YD, Chu, MC, Cui, MY, Cui, SW, Cui, XH, Cui, YD, Dai, BZ, Dai, HL, Dai, ZG, Danzengluobu, Diao, YX, Dong, XQ, Duan, KK, Fan, JH, Fan, YZ, Fang, J, Fang, JH, Fang, K, Feng, CF, Feng, H, Feng, L, Feng, SH, Feng, XT, Feng, Y, Feng, YL, Gabici, S, Gao, B, Gao, CD, Gao, Q, Gao, W, Gao, WK, Ge, MM, Ge, TT, Geng, LS, Giacinti, G, Gong, GH, Gou, QB, Gu, MH, Guo, FL, Guo, J, Guo, XL, Guo, YQ, Guo, YY, Han, YA, Hannuksela, OA, Hasan, M, He, HH, He, HN, He, JY, He, XY, He, Y, ndez-Cadena, SH, Hor, YK, Hou, BW, Hou, C, Hou, X, Hu, HB, Hu, SC, Huang, C, Huang, DH, Huang, JJ, Huang, TQ, Huang, WJ, Huang, XT, Huang, XY, Huang, Y, Huang, YY, Ji, XL, Jia, HY, Jia, K, Jiang, HB, Jiang, K, Jiang, XW, Jiang, ZJ, Jin, M, Kaci, S, Kang, MM, Karpikov, I, Khangulyan, D, Kuleshov, D, Kurinov, K, Li, BB, Li, C, Li, C, Li, D, Li, F, Li, HB, Li, HC, Li, J, Li, J, Li, K, Li, L, Li, RL, Li, SD, Li, TY, Li, WL, Li, XR, Li, X, Li, YZ, Li, Z, Li, Z, Liang, EW, Liang, YF, Lin, SJ, Liu, B, Liu, C, Liu, D, Liu, DB, Liu, H, Liu, HD, Liu, J, Liu, JL, Liu, JR, Liu, MY, Liu, RY, Liu, SM, Liu, W, Liu, X, Liu, Y, Liu, Y, Liu, YN, Lou, YQ, Luo, Q, Luo, Y, Lv, HK, Ma, BQ, Ma, LL, Ma, XH, Mao, JR, Min, Z, Mitthumsiri, W, Mou, GB, Mu, HJ, Nan, YC, Neronov, A, Ng, KCY, Ni, MY, Nie, L, Ou, LJ, Pattarakijwanich, P, Pei, ZY, Qi, JC, Qi, MY, Qin, JJ, Raza, A, Ren, CY, Ruffolo, D, Sáiz, A, Saeed, M, Semikoz, D, Shao, L, Shchegolev, O, Shen, YZ, Sheng, XD, Shi, ZD, Shu, FW, Song, HC, Stenkin, YV, Stepanov, V, Su, Y, Sun, DX, Sun, H, Sun, QN, Sun, XN, Sun, ZB, Tabasam, NH, Takata, J, Tam, PHT, Tan, HB, Tang, QW, Tang, R, Tang, ZB, Tian, WW, Tong, CN, Wan, LH, Wang, C, Wang, GW, Wang, HG, Wang, HH, Wang, JC, Wang, K, Wang, K, Wang, K, Wang, LP, Wang, LY, Wang, LY, Wang, R, Wang, W, Wang, XG, Wang, XJ, Wang, XY, Wang, Y, Wang, YD, Wang, ZH, Wang, ZX, Wang, Z, Wei, DM, Wei, JJ, Wei, YJ, Wen, T, Weng, SS, Wu, CY, Wu, HR, Wu, QW, Wu, S, Wu, XF, Wu, YS, Xi, SQ, Xia, J, Xia, JJ, Xiang, GM, Xiao, DX, Xiao, G, Xin, YL, Xing, Y, Xiong, DR, Xiong, Z, Xu, DL, Xu, RF, Xu, RX, Xu, WL, Xue, L, Yan, DH, Yan, JZ, Yan, T, Yang, CW, Yang, CY, Yang, FF, Yang, LL, Yang, MJ, Yang, RZ, Yang, WX, Yao, YH, Yao, ZG, Ye, XA, Yin, LQ, Yin, N, You, XH, You, ZY, Yu, YH, Yuan, Q, Yue, H, Zeng, HD, Zeng, TX, Zeng, W, Zha, M, Zhang, BB, Zhang, BT, Zhang, F, Zhang, H, Zhang, HM, Zhang, HY, Zhang, JL, Zhang, L, Zhang, PF, Zhang, PP, Zhang, R, Zhang, SR, Zhang, SS, Zhang, WY, Zhang, X, Zhang, XP, Zhang, Y, Zhang, Y, Zhang, ZP, Zhao, J, Zhao, L, Zhao, LZ, Zhao, SP, Zhao, XH, Zhao, ZH, Zheng, F, Zhong, WJ, Zhou, B, Zhou, H, Zhou, JN, Zhou, M, Zhou, P, Zhou, R, Zhou, XX, Zhou, XX, Zhu, BY, Zhu, CG, Zhu, FR, Zhu, H, Zhu, KJ, Zou, YC & Zuo, X 2025, 'Broadband γ-Ray Spectrum of Supernova Remnant Cassiopeia A', Astrophysical Journal Letters, vol. 982, no. 1, L33. https://doi.org/10.3847/2041-8213/adb97c

TY - JOUR

T1 - Broadband γ-Ray Spectrum of Supernova Remnant Cassiopeia A

AU - Cao, Zhen

AU - Aharonian, F.

AU - Bai, Y. X.

AU - Bao, Y. W.

AU - Bastieri, D.

AU - Bi, X. J.

AU - Bi, Y. J.

AU - Bian, W.

AU - Bukevich, A. V.

AU - Cai, C. M.

AU - Cao, W. Y.

AU - Cao, Zhe

AU - Chang, J.

AU - Chang, J. F.

AU - Chen, A. M.

AU - Chen, E. S.

AU - Chen, H. X.

AU - Chen, Liang

AU - Chen, Long

AU - Chen, M. J.

AU - Chen, M. L.

AU - Chen, Q. H.

AU - Chen, S.

AU - Chen, S. H.

AU - Chen, S. Z.

AU - Chen, T. L.

AU - Chen, X. B.

AU - Chen, X. J.

AU - Chen, Y.

AU - Cheng, N.

AU - Cheng, Y. D.

AU - Chu, M. C.

AU - Cui, M. Y.

AU - Cui, S. W.

AU - Cui, X. H.

AU - Cui, Y. D.

AU - Dai, B. Z.

AU - Dai, H. L.

AU - Dai, Z. G.

AU - Danzengluobu,

AU - Diao, Y. X.

AU - Dong, X. Q.

AU - Duan, K. K.

AU - Fan, J. H.

AU - Fan, Y. Z.

AU - Fang, J.

AU - Fang, J. H.

AU - Fang, K.

AU - Feng, C. F.

AU - Feng, H.

AU - Feng, L.

AU - Feng, S. H.

AU - Feng, X. T.

AU - Feng, Y.

AU - Feng, Y. L.

AU - Gabici, S.

AU - Gao, B.

AU - Gao, C. D.

AU - Gao, Q.

AU - Gao, W.

AU - Gao, W. K.

AU - Ge, M. M.

AU - Ge, T. T.

AU - Geng, L. S.

AU - Giacinti, G.

AU - Gong, G. H.

AU - Gou, Q. B.

AU - Gu, M. H.

AU - Guo, F. L.

AU - Guo, J.

AU - Guo, X. L.

AU - Guo, Y. Q.

AU - Guo, Y. Y.

AU - Han, Y. A.

AU - Hannuksela, O. A.

AU - Hasan, M.

AU - He, H. H.

AU - He, H. N.

AU - He, J. Y.

AU - He, X. Y.

AU - He, Y.

AU - ndez-Cadena, S. Hern

AU - Hor, Y. K.

AU - Hou, B. W.

AU - Hou, C.

AU - Hou, X.

AU - Hu, H. B.

AU - Hu, S. C.

AU - Huang, C.

AU - Huang, D. H.

AU - Huang, J. J.

AU - Huang, T. Q.

AU - Huang, W. J.

AU - Huang, X. T.

AU - Huang, X. Y.

AU - Huang, Y.

AU - Huang, Y. Y.

AU - Ji, X. L.

AU - Jia, H. Y.

AU - Jia, K.

AU - Jiang, H. B.

AU - Jiang, K.

AU - Jiang, X. W.

AU - Jiang, Z. J.

AU - Jin, M.

AU - Kaci, S.

AU - Kang, M. M.

AU - Karpikov, I.

AU - Khangulyan, D.

AU - Kuleshov, D.

AU - Kurinov, K.

AU - Li, B. B.

AU - Li, Cheng

AU - Li, Cong

AU - Li, D.

AU - Li, F.

AU - Li, H. B.

AU - Li, H. C.

AU - Li, Jian

AU - Li, Jie

AU - Li, K.

AU - Li, L.

AU - Li, R. L.

AU - Li, S. D.

AU - Li, T. Y.

AU - Li, W. L.

AU - Li, X. R.

AU - Li, Xin

AU - Li, Y. Z.

AU - Li, Zhe

AU - Li, Zhuo

AU - Liang, E. W.

AU - Liang, Y. F.

AU - Lin, S. J.

AU - Liu, B.

AU - Liu, C.

AU - Liu, D.

AU - Liu, D. B.

AU - Liu, H.

AU - Liu, H. D.

AU - Liu, J.

AU - Liu, J. L.

AU - Liu, J. R.

AU - Liu, M. Y.

AU - Liu, R. Y.

AU - Liu, S. M.

AU - Liu, W.

AU - Liu, X.

AU - Liu, Y.

AU - Liu, Y. N.

AU - Lou, Y. Q.

AU - Luo, Q.

AU - Luo, Y.

AU - Lv, H. K.

AU - Ma, B. Q.

AU - Ma, L. L.

AU - Ma, X. H.

AU - Mao, J. R.

AU - Min, Z.

AU - Mitthumsiri, W.

AU - Mou, G. B.

AU - Mu, H. J.

AU - Nan, Y. C.

AU - Neronov, A.

AU - Ng, K. C.Y.

AU - Ni, M. Y.

AU - Nie, L.

AU - Ou, L. J.

AU - Pattarakijwanich, P.

AU - Pei, Z. Y.

AU - Qi, J. C.

AU - Qi, M. Y.

AU - Qin, J. J.

AU - Raza, A.

AU - Ren, C. Y.

AU - Ruffolo, D.

AU - Sáiz, A.

AU - Saeed, M.

AU - Semikoz, D.

AU - Shao, L.

AU - Shchegolev, O.

AU - Shen, Y. Z.

AU - Sheng, X. D.

AU - Shi, Z. D.

AU - Shu, F. W.

AU - Song, H. C.

AU - Stenkin, Yu V.

AU - Stepanov, V.

AU - Su, Y.

AU - Sun, D. X.

AU - Sun, H.

AU - Sun, Q. N.

AU - Sun, X. N.

AU - Sun, Z. B.

AU - Tabasam, N. H.

AU - Takata, J.

AU - Tam, P. H.T.

AU - Tan, H. B.

AU - Tang, Q. W.

AU - Tang, R.

AU - Tang, Z. B.

AU - Tian, W. W.

AU - Tong, C. N.

AU - Wan, L. H.

AU - Wang, C.

AU - Wang, G. W.

AU - Wang, H. G.

AU - Wang, H. H.

AU - Wang, J. C.

AU - Wang, K.

AU - Wang, Kai

AU - Wang, L. P.

AU - Wang, L. Y.

AU - Wang, R.

AU - Wang, W.

AU - Wang, X. G.

AU - Wang, X. J.

AU - Wang, X. Y.

AU - Wang, Y.

AU - Wang, Y. D.

AU - Wang, Z. H.

AU - Wang, Z. X.

AU - Wang, Zheng

AU - Wei, D. M.

AU - Wei, J. J.

AU - Wei, Y. J.

AU - Wen, T.

AU - Weng, S. S.

AU - Wu, C. Y.

AU - Wu, H. R.

AU - Wu, Q. W.

AU - Wu, S.

AU - Wu, X. F.

AU - Wu, Y. S.

AU - Xi, S. Q.

AU - Xia, J.

AU - Xia, J. J.

AU - Xiang, G. M.

AU - Xiao, D. X.

AU - Xiao, G.

AU - Xin, Y. L.

AU - Xing, Y.

AU - Xiong, D. R.

AU - Xiong, Z.

AU - Xu, D. L.

AU - Xu, R. F.

AU - Xu, R. X.

AU - Xu, W. L.

AU - Xue, L.

AU - Yan, D. H.

AU - Yan, J. Z.

AU - Yan, T.

AU - Yang, C. W.

AU - Yang, C. Y.

AU - Yang, F. F.

AU - Yang, L. L.

AU - Yang, M. J.

AU - Yang, R. Z.

AU - Yang, W. X.

AU - Yao, Y. H.

AU - Yao, Z. G.

AU - Ye, X. A.

AU - Yin, L. Q.

AU - Yin, N.

AU - You, X. H.

AU - You, Z. Y.

AU - Yu, Y. H.

AU - Yuan, Q.

AU - Yue, H.

AU - Zeng, H. D.

AU - Zeng, T. X.

AU - Zeng, W.

AU - Zha, M.

AU - Zhang, B. B.

AU - Zhang, B. T.

AU - Zhang, F.

AU - Zhang, H.

AU - Zhang, H. M.

AU - Zhang, H. Y.

AU - Zhang, J. L.

AU - Zhang, Li

AU - Zhang, P. F.

AU - Zhang, P. P.

AU - Zhang, R.

AU - Zhang, S. R.

AU - Zhang, S. S.

AU - Zhang, W. Y.

AU - Zhang, X.

AU - Zhang, X. P.

AU - Zhang, Yi

AU - Zhang, Yong

AU - Zhang, Z. P.

AU - Zhao, J.

AU - Zhao, L.

AU - Zhao, L. Z.

AU - Zhao, S. P.

AU - Zhao, X. H.

AU - Zhao, Z. H.

AU - Zheng, F.

AU - Zhong, W. J.

AU - Zhou, B.

AU - Zhou, H.

AU - Zhou, J. N.

AU - Zhou, M.

AU - Zhou, P.

AU - Zhou, R.

AU - Zhou, X. X.

AU - Zhu, B. Y.

AU - Zhu, C. G.

AU - Zhu, F. R.

AU - Zhu, H.

AU - Zhu, K. J.

AU - Zou, Y. C.

AU - Zuo, X.

PY - 2025/3/20

Y1 - 2025/3/20

N2 - The core-collapse supernova remnant (SNR) Cassiopeia A (Cas A) is one of the brightest galactic radio sources with an angular radius of ~2.5 ¢ . Although no extension of this source has been detected in the γ-ray band, using more than 1000 days of LHAASO data above ∼0.8 TeV, we find that its spectrum is significantly softer than those obtained with Imaging Air Cherenkov Telescopes (IACTs), and its flux near ∼1 TeV is about 2 times higher. In combination with analyses of more than 16 yr of Fermi-LAT data covering 0.1 GeV–1 TeV, we find that the spectrum above 30 GeV deviates significantly from a single power law and is best described by a smoothly broken power law with a spectral index of 1.90 ± 0.15stat (3.41 ± 0.19stat) below (above) a break energy of 0.63 ± 0.21stat TeV. Given differences in the angular resolution of LHAASO-WCDA and IACTs, TeV γ-ray emission detected with LHAASO may have a significant contribution from regions surrounding the SNR illuminated by particles accelerated earlier, which, however, are treated as background by IACTs. Detailed modeling can be used to constrain the acceleration processes of TeV particles in the early stage of SNR evolution.

AB - The core-collapse supernova remnant (SNR) Cassiopeia A (Cas A) is one of the brightest galactic radio sources with an angular radius of ~2.5 ¢ . Although no extension of this source has been detected in the γ-ray band, using more than 1000 days of LHAASO data above ∼0.8 TeV, we find that its spectrum is significantly softer than those obtained with Imaging Air Cherenkov Telescopes (IACTs), and its flux near ∼1 TeV is about 2 times higher. In combination with analyses of more than 16 yr of Fermi-LAT data covering 0.1 GeV–1 TeV, we find that the spectrum above 30 GeV deviates significantly from a single power law and is best described by a smoothly broken power law with a spectral index of 1.90 ± 0.15stat (3.41 ± 0.19stat) below (above) a break energy of 0.63 ± 0.21stat TeV. Given differences in the angular resolution of LHAASO-WCDA and IACTs, TeV γ-ray emission detected with LHAASO may have a significant contribution from regions surrounding the SNR illuminated by particles accelerated earlier, which, however, are treated as background by IACTs. Detailed modeling can be used to constrain the acceleration processes of TeV particles in the early stage of SNR evolution.

KW - Gamma-ray astronomy (628)

KW - Supernova remnants (1667)

KW - Unified Astronomy Thesaurus concepts: High energy astrophysics (739)

UR - https://www.scopus.com/pages/publications/105000826702

U2 - 10.3847/2041-8213/adb97c

DO - 10.3847/2041-8213/adb97c

M3 - 文章

AN - SCOPUS:105000826702

SN - 2041-8205

VL - 982

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L33

ER -

Broadband γ-Ray Spectrum of Supernova Remnant Cassiopeia A

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this