Discovery of the Ultrahigh-energy Gamma-Ray Source LHAASO J2108+5157
Discovery of the Ultrahigh-energy Gamma-Ray Source LHAASO J2108+5157
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超高能伽马射线源LHAASO J2108 5157的发现
DOI：
10.3847/2041-8213/ac2579
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发表时间：
2021-06
期刊：
影响因子：
--
通讯作者：
Cao
中科院分区：
文献类型：
--
作者：
Cao
通过分析LHAASO- km2a 308.33天的数据，我们发现了一个UHE伽玛射线源LHAASO J2108+5157。在25-100 TeV和$\gt$100 TeV两个能量带，分别以9.5西格玛和8.5西格玛观测到显著过量的伽马射线引起的阵雨。该源的角扩展小于KM2A的点扩散函数，不适合作为一个广泛的源。测量到的20 ~ 200tev的能谱可以用指数为-2.83$\pm$ 0.18stat的幂律函数来近似描述。考虑到Fermi-LAT观测设定的通量上限，在较低能量下需要较硬的谱。伽马射线发射的位置与一个巨大的分子云有关，这有利于强子起源。目前还没有发现明显的对应物，更深入的多波长观测将有助于揭示这个有趣的UHE源。
We report the discovery of a UHE gamma-ray source, LHAASO J2108+5157, by analyzing the LHAASO-KM2A data of 308.33 live days. Significant excess of gamma-ray induced showers is observed in both energy bands of 25-100 TeV and $\gt$100 TeV with 9.5 sigma and 8.5 sigma, respectively. This source is not significantly favored as an extensive source with the angular extension smaller than the point-spread function of KM2A. The measured energy spectrum from 20 to 200 TeV can be approximately described by a power-law function with an index of -2.83$\pm$ 0.18stat. A harder spectrum is demanded at lower energies considering the flux upper limit set by Fermi-LAT observations. The position of the gamma-ray emission is correlated with a giant molecular cloud, which favors a hadronic origin. No obvious counterparts have been found, deeper multiwavelength observations will help to shed new light on this intriguing UHE source.
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DOI：
10.1088/0004-637x/694/1/12
发表时间：
2008-11
期刊：
The Astrophysical Journal
影响因子：
--
作者：
F. Mattana;M. Falanga;D. Gotz;R. Terrier;P. Esposito;A. Pellizzoni;A. Luca;V. Marandon;A. Goldwu
通讯作者：
F. Mattana;M. Falanga;D. Gotz;R. Terrier;P. Esposito;A. Pellizzoni;A. Luca;V. Marandon;A. Goldwu
DOI：
10.1086/375301
发表时间：
2003-06
期刊：
The Astronomical Journal
影响因子：
--
作者：
J. English;A. Taylor;J. Irwin;S. Dougherty;S. Basu;C. Beichman;Jo-Anne C. Brown;Y. Cao;C. Carignan;D. Crabtree;P. Dewdney;N. Duric;M. Fich;É. Gagnon;J. Galt;S. Germain;N. Ghazzali;S. Gibson;S. Godbout;A. Gray;D. Green;C. Heiles;M. Heyer;L. Higgs;S. Jean;D. Johnstone;G. Joncas;T. Landecker;W. Langer;D. Leahy;P. Martin;H. Matthews;W. Mccutcheon;G. Moriarity-Scheiven;S. Pineault;C. Purton;R. Roger;D. Routledge;N. St-Louis;K. Tapping;S. Terebey;F. Vaneldik;D. Watson;H. Wendker;T. Willis;X. Zhang
通讯作者：
J. English;A. Taylor;J. Irwin;S. Dougherty;S. Basu;C. Beichman;Jo-Anne C. Brown;Y. Cao;C. Carignan;D. Crabtree;P. Dewdney;N. Duric;M. Fich;É. Gagnon;J. Galt;S. Germain;N. Ghazzali;S. Gibson;S. Godbout;A. Gray;D. Green;C. Heiles;M. Heyer;L. Higgs;S. Jean;D. Johnstone;G. Joncas;T. Landecker;W. Langer;D. Leahy;P. Martin;H. Matthews;W. Mccutcheon;G. Moriarity-Scheiven;S. Pineault;C. Purton;R. Roger;D. Routledge;N. St-Louis;K. Tapping;S. Terebey;F. Vaneldik;D. Watson;H. Wendker;T. Willis;X. Zhang
影响因子：
4.9
作者：
Atwood, W. B.;Abdo, A. A.;Ziegler, M.
通讯作者：
Ziegler, M.
DOI：
10.22323/1.358.0219
发表时间：
2019-07
期刊：
Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)
影响因子：
--
作者：
Song-zhan Chen
通讯作者：
Song-zhan Chen
影响因子：
0.6
作者：
Huihai He;F. C. Collaboration
通讯作者：
Huihai He;F. C. Collaboration