Does the gamma-ray signal from the central milky way indicate sommerfeld enhancement of dark matter annihilation?

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Abstract

Recently, some studies showed that the GeV gamma-ray excess signal from the central Milky Way can be explained by the annihilation of ~ 40 GeV dark matter through the bbar b channel. Based on the morphology of the gamma-ray flux, the best-fit inner slope of the dark matter density profile is γ = 1.26. However, recent analyses of the Milky Way dark matter profile favor γ = 0.6 – 0.8. In this article, we show that the GeV gamma-ray excess can also be explained by the Sommerfeld-enhanced dark matter annihilation through the bbar b channel with γ = 0.85 – 1.05. We constrain the parameters of the Sommerfeld-enhanced annihilation by using data from Fermi-LAT. We also show that the predicted gamma-ray fluxes emitted from dwarf galaxies generally satisfy recent upper limits on gamma-ray fluxes detected by Fermi-LAT. Copyright © 2016 National Astronomical Observatories, Chinese Academy of Sciences and IOP Publishing Ltd.
Original languageEnglish
Pages (from-to)163
JournalResearch in Astronomy and Astrophysics
Volume16
Issue number10
DOIs
Publication statusPublished - Oct 2016

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dark matter
gamma rays
augmentation
astronomical observatories
dwarf galaxies
profiles
observatory
slopes

Citation

Chan, M. H. (2016). Does the gamma-ray signal from the central milky way indicate sommerfeld enhancement of dark matter annihilation?. Research in Astronomy and Astrophysics, 16(10), 163.