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Chinese Physics C > 2019, Vol. 43 > Issue(8): 085101 DOI: 10.1088/1674-1137/43/8/085101

Nearby dark matter subhalo that accounts for the DAMPE excess

  • 1.

    College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China

  • 2.

    Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

  • 3.

    School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

  • The precise spectrum of electrons and positrons at high energies plays an important role in understanding their origin. DArk Matter Particle Explorer has reported their first measurement of the $e^+e^- $ spectrum from 25 GeV to 4.6 TeV. This spectrum reveals a tentative peak at ~1.4 TeV, which requires a nearby source of $e^+e^- $ . In this work, we study the properties of a large nearby dark matter subhalo that accouns for this spectral peak, such as its mass and distance from Earth, for different concentration models. We compare spectra of the sources in 3FGL with that from DM annihilation in the subhalo, and find ten candidates that have comparable gamma-ray spectra. However, according to the N-body simulation, the probability that such a large subhalo is close enough to Earth is less than 0.1%.
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  • References

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Yi Zhao, Xiao-Jun Bi, Su-Jie Lin and Peng-Fei Yin. Nearby dark matter subhalo that accounts for the DAMPE excess[J]. Chinese Physics C, 2019, 43(8): 085101. doi: 10.1088/1674-1137/43/8/085101
Yi Zhao, Xiao-Jun Bi, Su-Jie Lin and Peng-Fei Yin. Nearby dark matter subhalo that accounts for the DAMPE excess[J]. Chinese Physics C, 2019, 43(8): 085101. doi:10.1088/1674-1137/43/8/085101 shu
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Received: 2019-04-10
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    Nearby dark matter subhalo that accounts for the DAMPE excess

    • 1. College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, China
    • 2. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    • 3. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
    • Received Date:2019-04-10
    • Available Online:2019-08-01

      Abstract:The precise spectrum of electrons and positrons at high energies plays an important role in understanding their origin. DArk Matter Particle Explorer has reported their first measurement of the $e^+e^- $ spectrum from 25 GeV to 4.6 TeV. This spectrum reveals a tentative peak at ~1.4 TeV, which requires a nearby source of $e^+e^- $ . In this work, we study the properties of a large nearby dark matter subhalo that accouns for this spectral peak, such as its mass and distance from Earth, for different concentration models. We compare spectra of the sources in 3FGL with that from DM annihilation in the subhalo, and find ten candidates that have comparable gamma-ray spectra. However, according to theN-body simulation, the probability that such a large subhalo is close enough to Earth is less than 0.1%.

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