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Chinese Physics C> 2018, Vol. 42> Issue(2) : 025102 DOI: 10.1088/1674-1137/42/2/025102

Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT

  • 1.

     Theoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

  • 2.

     Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, China

  • 3.

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

  • 4.

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

  • 5.

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

  • 6.

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

  • Recently, many new dwarf spheroidal satellites (dSphs) have been discovered by the Dark Energy Survey (DES). These dSphs are ideal candidates for probing for gamma-ray emissions from dark matter (DM) annihilation. However, no significant signature has been found by the Fermi-LAT dSph observations. In this work, we reanalyze the Fermi-LAT Pass 8 data from the direction of Reticulum Ⅱ, where a slight excess has been reported by some previous studies. We treat Reticulum Ⅱ (DES J0335.6-5403) as a spatially extended source, and find that no significant gamma-ray signature is observed. Based on this result, we set upper-limits on the DM annihilation cross section.
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  • References

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Yi Zhao, Xiao-Jun Bi, Peng-Fei Yin and Xinmin Zhang. Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT[J]. Chinese Physics C, 2018, 42(2): 025102. doi: 10.1088/1674-1137/42/2/025102
Yi Zhao, Xiao-Jun Bi, Peng-Fei Yin and Xinmin Zhang. Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT[J]. Chinese Physics C, 2018, 42(2): 025102.  doi: 10.1088/1674-1137/42/2/025102 shu
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Received: 2017-11-02
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    Supported by National Natural Science Foundation of China (11121092, 11033005, 11375202, 11475191, 11475189), the CAS pilot B program (XDB23020000) and the National Key Program for Research and Development (2016YFA0400200)

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Searching for γ-ray emission from Reticulum Ⅱ by Fermi-LAT

  • 1. Theoretical Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 2. Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, China
  • 3. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 4. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 5.  Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 6. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received Date: 2017-11-02
  • Available Online: 2018-02-05
Fund Project:  Supported by National Natural Science Foundation of China (11121092, 11033005, 11375202, 11475191, 11475189), the CAS pilot B program (XDB23020000) and the National Key Program for Research and Development (2016YFA0400200)

Abstract: Recently, many new dwarf spheroidal satellites (dSphs) have been discovered by the Dark Energy Survey (DES). These dSphs are ideal candidates for probing for gamma-ray emissions from dark matter (DM) annihilation. However, no significant signature has been found by the Fermi-LAT dSph observations. In this work, we reanalyze the Fermi-LAT Pass 8 data from the direction of Reticulum Ⅱ, where a slight excess has been reported by some previous studies. We treat Reticulum Ⅱ (DES J0335.6-5403) as a spatially extended source, and find that no significant gamma-ray signature is observed. Based on this result, we set upper-limits on the DM annihilation cross section.

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