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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1602.06527 (astro-ph)
[Submitted on 21 Feb 2016 (v1), last revised 26 May 2016 (this version, v2)]

Title:Search for a gamma-ray line feature from a group of nearby Galaxy clusters with Fermi LAT Pass 8 data

Authors:Yun-Feng Liang, Zhao-Qiang Shen, Xiang Li, Yi-Zhong Fan, Xiaoyuan Huang, Shi-Jun Lei, Lei Feng, En-Wei Liang, Jin Chang
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Abstract:Galaxy clusters are the largest gravitationally bound objects in the universe and may be suitable targets for indirect dark matter searches. With 85 months of Fermi-LAT Pass 8 publicly available data, we analyze the gamma-ray emission in the directions of 16 nearby Galaxy Clusters with an unbinned likelihood analysis. No globally statistically-significant $\gamma-$ray line feature is identified and a tentative line signal may be present at $\sim 43$ GeV. The 95\% confidence level upper limits on the velocity-averaged cross section of dark matter particles annihilating into double $\gamma-$rays (i.e., $\langle \sigma v \rangle_{\chi\chi\rightarrow \gamma\gamma}$) are derived. Unless very optimistic boost factors of dark matter annihilation in these Galaxy Clusters have been assumed, such constraints are much weaker than the bounds set by the Galactic $\gamma-$ray data.
Comments: The version published in Phys. Rev. D, minor revision (10 pages including 4 eps figures)
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1602.06527 [astro-ph.HE]
  (or arXiv:1602.06527v2 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1602.06527
Journal reference: Phys. Rev. D 93, 103525 (2016)
Related DOI: https://doi.org/10.1103/PhysRevD.93.103525

Submission history

From: Yi-Zhong Fan [view email]
[v1] Sun, 21 Feb 2016 13:36:38 UTC (53 KB)
[v2] Thu, 26 May 2016 00:40:13 UTC (53 KB)
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