Spectral and spatial variations of the diffuse gamma-ray background in the vicinity of the Galactic plane and possible nature of the feature at 130 GeV

Abstract

We study the properties of the diffuse gamma-ray background around the Galactic plane at energies 20 -- 200 GeV. We find that the spectrum of this emission possesses significant spacial variations with respect to the average smooth component. The positions and shapes of these spectral features change with the direction on the sky. We therefore argue, that the spectral feature around 130 GeV, found in several regions around the Galactic Center and in the Galactic plane in [1203.1312, 1204.2797, 1205.1045, 1206.1616], can not be interpreted with confidence as a gamma-ray line, but may be a component of the diffuse background and can be of instrumental or astrophysical origin. Therefore, the dark matter origin of this spectral feature becomes dubious.

Extended analysis that further confirms the existence of several "hot spots" around the Galactic plane and discussion of their possible origin

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Cited by in corpus (19)

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• Investigating Gamma-Ray Lines from Dark Matter with Future Observatories
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• Neutralino dark matter and the Fermi gamma-ray lines
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• Axino dark matter with R-parity violation and 130 GeV gamma-ray line
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• Statistical interpretation of the spatial distribution of current 130 GeV gamma-ray line signal within the dark matter annihilation scenario
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• Right Sneutrino Dark Matter and a Monochromatic Photon Line
• TASI 2014 Lectures: The Hunt for Dark Matter
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• Remarks on Two Gamma Ray Lines from the Inner Galaxy
• Limits on the Weyl meson parameters due to Fermi-LAT gamma-ray observations
• 130GeV gamma-ray line through axion conversion