On The Origin Of The Gamma Rays From The Galactic Center

Abstract

The region surrounding the center of the Milky Way is both astrophysically rich and complex, and is predicted to contain very high densities of dark matter. Utilizing three years of data from the Fermi Gamma Ray Space Telescope (and the recently available Pass 7 ultraclean event class), we study the morphology and spectrum of the gamma ray emission from this region and find evidence of a spatially extended component which peaks at energies between 300 MeV and 10 GeV. We compare our results to those reported by other groups and find good agreement. The extended emission could potentially originate from either the annihilations of dark matter particles in the inner galaxy, or from the collisions of high energy protons that are accelerated by the Milky Way's supermassive black hole with gas. If interpreted as dark matter annihilation products, the emission spectrum favors dark matter particles with a mass in the range of 7-12 GeV (if annihilating dominantly to leptons) or 25-45 GeV (if annihilating dominantly to hadronic final states). The intensity of the emission corresponds to a dark matter annihilation cross section consistent with that required to generate the observed cosmological abundance in the early universe (sigma v ~ 3 x 10^-26 cm^3/s). We also present conservative limits on the dark matter annihilation cross section which are at least as stringent as those derived from other observations.

13 pages, 11 figures

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• The Earth Mover's Pinball Loss: Quantiles for Histogram-Valued Regression
• Interpretation of the Galactic gamma-ray excess with the dark matter indicated by ${}^8$Be and ${}^4$He anomalous transitions
• $\mathcal{O}$(1) GeV dark matter in SUSY and a very light pseudoscalar at the LHC
• Possible counterpart signal of the Fermi bubbles at the cosmic-ray positrons
• Are we really seeing dark matter signals from the Milky Way center?
• On the Gravitational Wave Counterpart to a Gamma-ray Galactic Center Signal from Millisecond Pulsars
• Improved Modeling of the Discrete Component of the Galactic Interstellar Gamma-ray Emission and Implications for the Fermi-LAT Galactic Center Excess
• Characterizing the Expected Behavior of Non-Poissonian Template Fitting
• Non-Standard Neutrino Spectra From Annihilating Neutralino Dark Matter
• The Galactic Isotropic $\gamma$-ray Background and Implications for Dark Matter
• A Fermi-LAT Study of Globular Cluster Dynamical Evolution in the Milky Way: Millisecond Pulsars as the Probe
• Higgs, supersymmetry and dark matter after Run I of the LHC
• Extended Higgs-portal dark matter and the Fermi-LAT Galactic Center Excess
• Lα line of dark positronium as nongravitational detection of dark matter
• Spin-one dark matter and gamma ray signals from the galactic center
• The Density of Dark Matter in the Galactic Bulge and Implications for Indirect Detection
• Implications of the Fermi-LAT Pass 8 Galactic Center Excess on Supersymmetric Dark Matter
• Blois 2019: highlights and outlook
• On the Energy Distribution of the Galactic Center Excess' Sources
• Millisecond Pulsars in Globular Clusters and Implications for the Galactic Center Gamma-Ray Excess
• Probing the millisecond pulsar origin of the $\gamma$-ray excess in the Galactic centre with LISA
• What Can Gamma-rays from Space tell us About the Madala Hypothesis?
• Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X
• Dark Matter Phenomenology: Sterile Neutrino Portal and Gravitational Portal in Extra-Dimensions
• Searching for dark matter annihilation in the Sun with the IceCube Upgrade
• Search for new physics in jet multiplicity patterns of multilepton events at $\sqrt{s}$ = 13 TeV
• Astrophysical Signatures of Fermionic Dark Matter
• Extragalactic Searches for Dark Matter Annihilation
• New energy spectra in neutrino and photon detectors to reveal hidden dark matter signals
• Probing Bottom-flavored Scalar Dark Matters at Loop Level