Statistical interpretation of the spatial distribution of current 130 GeV gamma-ray line signal within the dark matter annihilation scenario

Abstract

Recently, several groups identified a tentative $\gamma$-ray line signal with energy $\sim 130$ GeV in the central Galaxy from the Fermi-LAT data. %The morphology study shows that the signal is consistent with dark matter %annihilation, but with an offset $\sim 220$ pc ($1.5^{\circ }$) of the %center from the Galactic center Sgr A${}^{\star }$, Such a $\gamma -$ray line can be interpreted as the signal of dark matter annihilation. However, the offset $\sim 220$ pc ($1.5^{\circ }$) of the center of the most prominent signal region from the Galactic center Sgr A${}^{\star }$ has been thought to challenge the dark matter annihilation interpretation. Considering the fact that such a 130 GeV $\gamma$-ray line signal consists of only $\sim 14$ photons, we suggest that the "imperfect" consistency of these photons with the expected dark matter distribution is due to the limited statistics. The offset will be smaller as more signal photons have been collected in the near future. Our Monte Carlo simulation supports the above speculation.

arXiv comment4 pages, 2 figures, Phys. Lett. B in press

References in corpus (15)

• A Universal Density Profile from Hierarchical Clustering
• A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope
• Strong Evidence for Gamma-ray Line Emission from the Inner Galaxy
• What if Dark Matter Gamma-Ray Lines come with Gluon Lines?
• 130 GeV dark matter and the Fermi gamma-ray line
• Dirac right-handed sneutrino dark matter and its signature in the gamma-ray lines
• A 130 GeV photon line from dark matter annihilation in the NMSSM
• Fermi Gamma Ray Line at 130 GeV from Axion-Mediated Dark Matter
• 130 GeV Fermi gamma-ray line from dark matter decay
• Cold ultrarelativistic pulsar winds as potential sources of galactic gamma-ray lines above 100 GeV
• 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
• Testing the 130 GeV gamma-ray line with high energy resolution detectors
• Brightening the (130 GeV) Gamma-Ray Line
• PAMELA/Fermi-LAT electron cosmic ray spectrum at $\sim$100 GeV: implication for dark matter annihilation signal in accordance with the 130 GeV $\gamma$-ray line
• Mixed Wino-Axion Dark Matter in String/M Theory and the 130 GeV Gamma-line "Signal"

Cited by in corpus (15)

• 130 GeV gamma-ray line and enhancement of $h\to \gamma \gamma$ in the Higgs triplet model plus a scalar dark matter
• UV Completions of Magnetic Inelastic Dark Matter and RayDM for the Fermi Line(s)
• Three Exceptions for Thermal Dark Matter with Enhanced Annihilation to Gamma Gamma
• Search for a gamma-ray line feature from a group of nearby Galaxy clusters with Fermi LAT Pass 8 data
• Composite magnetic dark matter and the 130 GeV line
• Galactic Center Radio Constraints on Gamma-Ray Lines from Dark Matter Annihilation
• Indirect Detection of Dark Matter with gamma rays
• The 130 GeV Fingerprint of Right-Handed Neutrino Dark Matter
• Fermi-LAT gamma-ray signal from Earth Limb, systematic detector effects and their implications for the 130 GeV gamma-ray excess
• PAMELA/Fermi-LAT electron cosmic ray spectrum at $\sim$100 GeV: implication for dark matter annihilation signal in accordance with the 130 GeV $\gamma$-ray line
• Are Lines From Unassociated Gamma-Ray Sources Evidence For Dark Matter Annihilation?
• A Clustering Analysis of the Morphology of the 130 GeV Gamma-Ray Feature
• Where are the Fermi Lines Coming From?
• The spatial distribution of dark-matter-annihilation originated gamma-ray line signal
• 130GeV gamma-ray line through axion conversion