Constraints on the dark matter annihilation scenario of Fermi 130 GeV gamma-ray line emission by continuous gamma-rays, Milky Way halo, galaxy clusters and dwarf galaxies observations

Journal Article · Thu Nov 01 04:00:00 EDT 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/11/048· OSTI ID:22279851

Huang, Xiaoyuan; Chen, Xuelei ^[1]; Yuan, Qiang; Yin, Peng-Fei; Bi, Xiao-Jun ^[2]

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1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
2. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)

It was recently reported that there may exist monochromatic γ-ray emission at ∼ 130 GeV from the Galactic center in the Fermi Large Area Telescope data, which might be related with dark matter (DM) annihilation. In this work we carry out a comprehensive check of consistency of the results with the DM annihilation scenario, using the 3.7 yrs Fermi observation of the inner Galaxy, Galactic halo, clusters of galaxies and dwarf galaxies. The results found are as follows. 1) Very strong constraints on the DM annihilation into continuous γ-rays from the Galactic center are set, which are as stringent as the 'natural' scale assuming thermal freeze-out of DM. Such limit sets strong constraint on the DM models to explain the line emission. 2) No line emission from the Galactic halo is found in the Fermi data, (and the constraints on line emission is marginally consistent with) the DM annihilation interpretation of the ∼ 130 GeV line emission from the inner Galaxy. 3) No line emission from galaxy clusters and dwarf galaxies is detected, although possible concentration of photons from clusters in 120–140 GeV is revealed. The constraints from clusters and dwarf galaxies are weak and consistent with the DM annihilation scenario to explain the ∼ 130 GeV line emission.

• OSTI ID: 22279851
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 11 Vol. 2012; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANNIHILATION
ASTROPHYSICS
CONCENTRATION RATIO
COSMIC PHOTONS
COSMOLOGY
GALAXY CLUSTERS
GAMMA RADIATION
GEV RANGE
LIMITING VALUES
MILKY WAY
MONOCHROMATIC RADIATION
NONLUMINOUS MATTER