Dark Matter Annihilation in The Galactic Center As Seen by the Fermi Gamma Ray Space Telescope

Abstract

We analyze the first two years of data from the Fermi Gamma Ray Space Telescope from the direction of the inner 10 degrees around the Galactic Center with the intention of constraining, or finding evidence of, annihilating dark matter. We find that the morphology and spectrum of the emission between 1.25 degrees and 10 degrees from the Galactic Center is well described by a the processes of decaying pions produced in cosmic ray collisions with gas, and the inverse Compton scattering of cosmic ray electrons in both the disk and bulge of the Inner Galaxy, along with gamma rays from known points sources in the region. The observed spectrum and morphology of the emission within approximately 1.25 degrees (~175 parsecs) of the Galactic Center, in contrast, departs from the expectations for by these processes. Instead, we find an additional component of gamma ray emission that is highly concentrated around the Galactic Center. The observed morphology of this component is consistent with that predicted from annihilating dark matter with a cusped (and possibly adiabatically contracted) halo distribution (density proportional to r^{-gamma}, with gamma=1.18 to 1.33). The observed spectrum of this component, which peaks at energies between 1-4 GeV (in E^2 units), can be well fit by a 7-10 GeV dark matter particle annihilating primarily to tau leptons with a cross section in the range of 4.6 x 10^-27 to 5.3 x 10^-26 cm^3/s, depending on how the dark matter distribution is normalized. We also discuss other sources for this emission, including the possibility that much of it originates from the Milky Way's supermassive black hole.

23 pages, 16 figures

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• Molecular Clouds as the Origin of the Fermi Gamma-Ray GeV-Excess
• Known Radio Pulsars Do Not Contribute to the Galactic Center Gamma-Ray Excess
• Searching for Dark Matter Annihilation in the Smith High-Velocity Cloud
• Cherenkov Telescope Array sensitivity to the putative millisecond pulsar population responsible for the Galactic center excess
• Testing Type II Radiative Seesaw Model: from Dark Matter Detection to LHC Signatures
• Indirect Probes of Dark Matter and Globular Cluster Properties From Dark Matter Annihilation within the Coolest White Dwarfs
• Updated Collider and Direct Detection Constraints on Dark Matter Models for the Galactic Center Gamma-Ray Excess
• Mixed Dark Matter in Left-Right Symmetric Models
• An Elusive Vector Dark Matter
• Constraints on dark matter annihilation and decay from the large-scale structure of the nearby universe
• Robustness of dark matter constraints and interplay with collider searches for New Physics
• Multi-messenger constraints on dark matter annihilation into electron-positron pairs
• Robust inference of the Galactic centre gamma-ray excess spatial properties
• Lepton-Flavor Violating Mediators
• Dark matter annihilation into right-handed neutrinos and the galactic center gamma-ray excess
• Muon g-2 and galactic centre $\gamma$-ray excess in a scalar extension of the 2HDM type-X
• A Phantom Menace: On the Morphology of the Galactic Center Excess
• A Robust Approach to Constraining Dark Matter from Gamma-Ray Data
• Reconstructing WIMP properties through an interplay of signal measurements in direct detection, Fermi-LAT, and CTA searches for dark matter
• Dark Matter Annihilation into Four-Body Final States and Implications for the AMS Antiproton Excess
• Determining the Quantum Numbers of Simplified Models in $t\bar{t}X$ production at the LHC
• Strongly Interacting Neutrino Portal Dark Matter
• Wavelet-Based Techniques for the Gamma-Ray Sky
• The Sensitivity of Future Gamma-Ray Telescopes to Primordial Black Holes
• Antiproton signatures from astrophysical and dark matter sources at the galactic center
• Tau Portal Dark Matter models at the LHC
• Inverse Compton emission from millisecond pulsars in the Galactic bulge
• The effect of stellar encounters on the dark matter annihilation signal from prompt cusps
• Fermi LAT observations of Sagittarius A*: Imaging Analysis
• Dark Matter, Shared Asymmetries, and Galactic Gamma Ray Signals
• Connecting the new H.E.S.S. diffuse emission at the Galactic center with the Fermi GeV excess: a combination of millisecond pulsars and heavy dark matter?
• Dark matter annihilation and the Galactic Centre Excess
• Fermionic Dark Matter through a Light Pseudoscalar Portal: Hints from the DAMA Results
• Robustness of the Galactic Center Excess Morphology Against Masking
• Di-photon excess at LHC and the gamma ray excess at the Galactic Centre
• Illuminating the Darkest Galaxies
• Exploring the Nature of the Galactic Center Gamma-Ray Source with the Cherenkov Telescope Array
• Search for gamma-ray line features from Milky Way satellites with Fermi-LAT Pass 8 data
• 3FGL J1924.8-1034 : A Spatially-Extended Stable Unidentified GeV Source?
• Revisiting XENON100's Constraints (and Signals?) For Low-Mass Dark Matter
• Constraints on dark matter annihilation from the FAST observation of the Coma Berenices dwarf galaxy
• Dark matter implications of the WMAP-Planck Haze
• A Compound Poisson Generator approach to Point-Source Inference in Astrophysics
• Degeneracies between baryons and dark matter: the challenge of constraining the nature of dark matter with JWST
• The Anisotropy of the Extragalactic Radio Background from Dark Matter Annihilation
• Dark matter substructure cannot explain properties of the Fermi Galactic Centre excess
• Dark Matter Overview: Collider, Direct and Indirect Detection Searches
• Muonphilic Dark Matter explanation of gamma-ray galactic center excess: a comprehensive analysis
• New determination of the production cross section for $\gamma$ rays in the Galaxy
• Search for gamma-ray emission from the 12 nearby dwarf spheroidal galaxies with 12 years of Fermi-LAT data
• Gamma-rays From Warm WIMP Dark Matter Annihilation
• Planck-scale effects on WIMP dark matter
• Gamma Ray polarimetry; a new window for the non-thermal Universe
• On the importance of direct detection combined limits for spin independent and spin dependent dark matter interactions
• A Combined Radio Multi-Survey Catalog of Fermi Unassociated Sources
• Comparing Galactic Center MSSM dark matter solutions to the Reticulum II gamma-ray data
• What the Milky Way's Dwarfs tell us about the Galactic Center extended excess
• Probing the pulsar explanation of the Galactic-Center GeV excess using continuous gravitational-wave searches
• Search for gamma-ray emission from the nearby dwarf spheroidal galaxies with 9 years of Fermi-LAT data
• Searching for dark matter annihilation from individual halos: uncertainties, scatter and signal-to-noise ratios
• Mind the gap: The discrepancy between simulation and reality drives interpretations of the Galactic Center Excess
• Gamma-Ray Constraints on the First Stars from Annihilation of Light WIMPs
• Dark Matter Detection with Hard X-ray Telescopes
• Gamma-ray image reconstruction of the Andromeda galaxy
• Search for dark matter particles in proton-proton collisions at sqrt(s) = 8 TeV using the razor variables
• Dark Matter annihilation energy output and its effects on the high-z IGM
• Asymmetric Dark Matter
• Thermodynamic Evolution of Secluded Vector Dark Matter: Conventional WIMPs and Nonconventional WIMPs
• The case for 100 GeV bino dark matter: A dedicated LHC tri-lepton search
• Prospects for higgsino-singlino dark matter detection at IceCube and PINGU
• How to calculate dark matter direct detection exclusion limits that are consistent with gamma rays from annihilation in the Milky Way halo
• Interpreting the galactic center gamma-ray excess in the NMSSM
• Signatures of top flavour-changing dark matter
• Baryogenesis from spontaneous CP violation in the early Universe
• Explaining Low Energy $\gamma$-ray Excess from the Galactic Centre using a Two Component Dark Matter Model
• Interpretation of the gamma-ray excess and AMS-02 antiprotons: Velocity dependent dark matter annihilations
• Neutrinos from WIMP annihilation in the Sun : Implications of a self-consistent model of the Milky Way's dark matter halo
• Probing Flavor Structure of Cosmic Ray $e^{\mp }$ Spectrum and Implications for Dark Matter Indirect Searches
• The consequence of a new ISRF model of the Milky Way on predictions for diffuse gamma-ray emission
• The Andromeda Gamma-Ray Excess: Background Systematics of the Millisecond Pulsars and Dark Matter Interpretations
• A Closer Look at CP-Violating Higgs Portal Dark Matter as a Candidate for the GCE
• An update on the two singlet Dark Matter model
• The Galactic Center Excess from Z3 Scalar Semi-Annihilations
• Velocity-dependent annihilation radiation from dark matter subhalos in cosmological simulations
• Searching for High Energy Neutrino counterpart signals; The case of the Fermi Bubbles signal and of Dark Matter annihilation in the inner Galaxy
• Multi-Component Imaging of the Fermi Gamma-ray Sky in the Spatio-spectral Domain
• Effective field theory analysis of dark matter-standard model interactions with spin one mediators
• Very Old Isolated Compact Objects as Dark Matter Probes
• Revisiting GeV-scale annihilating dark matter with the AMS-02 positron fraction
• Interpreting the Fermi-LAT gamma ray excess in the simplified framework
• How to produce antinuclei from dark matter
• A New Determination of the Millisecond Pulsar Gamma-Ray Luminosity Function and Implications for the Galactic Center Gamma-Ray Excess
• Searching for Gamma-Ray Emission from Reticulum II by Fermi-LAT
• New dark matter analysis of Milky Way dwarf satellite galaxies with MADHATv2
• A Multi-frequency analysis of possible Dark Matter Contributions to M31 Gamma-Ray Emissions
• Towards a Bullet-proof test for indirect signals of dark matter
• Enhanced lines and box-shaped features in the gamma-ray spectrum from annihilating dark matter in the NMSSM
• Towards resolving the Galactic center GeV excess with millisecond-pulsar-like sources using machine learning
• Addressing $\gamma$-ray emissions from dark matter annihilations in 45 milky way satellite galaxies and in extragalactic sources with particle dark matter models
• Study of WIMP annihilations into a pair of on-shell scalar mediators
• Everything You Always Wanted to Know About Dark Matter Elastic Scattering Through Higgs Loops But Were Afraid to Ask
• On Dark Matter Explanations of the Gamma-Ray Excesses from the Galactic Center and M31
• Search for a new pseudoscalar decaying into a pair of muons in events with a top-quark pair at $\sqrt{s}=13$ TeV with the ATLAS detector
• Possible explanation of indirect gamma ray signatures from hidden sector fermionic dark matter
• Hidden Higgs Portal Vector Dark Matter for the Galactic Center Gamma-Ray Excess from the Two-Step Cascade Annihilation, and Muon g-2
• Late-forming black holes and the antiproton, gamma-ray, and anti-helium excesses
• Indirect Detection Imprint of a CP Violating Dark Sector
• Millisecond Pulsar Kicks Cause Difficulties in Explaining the Galactic Center Gamma-Ray Excess
• Dark Matter in Leptophilic Higgs Models After the LHC Run-I
• The prediction of using LHAASO's cosmic-ray electron measurements to constrain decaying heavy dark matter
• Millisecond Pulsars in Dense Star Clusters: Evolution, Scaling Relations, and the Galactic-Center Gamma-ray Excess
• Exotic Lepton-Flavor Violating Higgs Decays
• Extracting the unresolved pulsar contribution to the gamma-ray background
• "Non-Local" Effects from Boosted Dark Matter in Indirect Detection
• A light scalar WIMP through the Higgs portal?
• Search for Scalar Dark Matter via Pseudoscalar Portal Interactions: In Light of the Galactic Center Gamma-Ray Excess
• Phenomenology of Colored Radiative Neutrino Mass Model and Its Implications on the Cosmic-ray Observations
• Current status and desired accuracy of the isotopic production cross-sections relevant to astrophysics of cosmic rays II. Fluorine to Silicon (and updated LiBeB)
• Gamma rays from dark matter spikes in EAGLE simulations
• Gamma-ray line constraints on Coy Dark Matter
• Low-mass neutralino dark matter in supergravity scenarios: phenomenology and naturalness
• Interpretations of galactic center gamma-ray excess confronting the PandaX-II constraints on dark matter-neutron spin-dependent scatterings in the NMSSM
• Consistency test of the AMS-02 antiproton excess with direct detection data based on the effective field theory approach
• Collider probes of singlet fermionic dark matter scenarios for the Fermi gamma-ray excess
• TeV gamma-ray sensitivity to velocity-dependent dark matter models in the Galactic Center
• Explaining the Fermi Galactic Centre Excess in the CMSSM
• Searching for velocity-dependent dark matter annihilation signals from extragalactic halos
• Using $\gamma$-ray observations of dwarf spheroidal galaxies to test the possible common origin of the W-boson mass anomaly and the GeV $\gamma$-ray/antiproton excesses
• Quantum Simulations of Dark Sector Showers
• Testing the dark matter origin of the WMAP-Planck Haze with radio observations of Spiral Galaxies
• Saas-Fee Lecture Notes: Multi-messenger Astronomy and Dark Matter
• Can Dark Stars account for the star formation efficiency excess at very high redshifts?
• Cold Positrons from Decaying Dark Matter
• Absence of TeV halos around millisecond pulsars
• Dwarf Galaxy $\gamma$-excess and 3.55 keV X-ray Line In A Nonthermal Dark Matter Model
• Interpretations of the possible 42.7 GeV $\gamma$-ray line
• Dark Matter Is The New BBN
• Low Mass Pseudoscalar Dark Matter in an Extended B - L Model
• Collider limits on dark matter
• Semi-dark Higgs decays: sweeping the Higgs neutrino floor
• Constraints on Axion-like Particles from the gamma-ray observation of the Galactic Center
• Investigating the Fermi Large Area Telescope sensitivity of detecting the characteristics of the Galactic center excess
• Search for pseudoscalar-mediated WIMPs in $t\to c$ transitions with missing energy
• The Cherenkov Telescope Array Will Test Whether Pulsars Generate the Galactic Center Gamma-Ray Excess
• Fermi-LAT searches for gamma-ray pulsars
• Searching for Dark Photon Dark Matter with Cosmic Ray Antideuterons
• Extension of Minimal Fermionic Dark Matter Model : A Study with Two Higgs Doublet Model
• Indirect detection of Dark matter with gamma-rays - status and perspectives
• A Potentially Detectable Gamma-Ray Line in the Fermi Galactic Center Excess -- In Light of One-Step Cascade Annihilations of Secluded (Vector) Dark Matter via the Higgs Portal
• The Velocity-Dependent $J$-factor of the Milky Way Halo: Does What Happens in the Galactic Bulge Stay in the Galactic Bulge?
• One of Everything: The Breakthrough Listen Exotica Catalog
• Reconciling Higgs physics and pseudo-Nambu-Goldstone dark matter in the S2HDM using a genetic algorithm
• Soft Gamma Rays from Heavy WIMPs
• Scalar Dark Matter Candidates in Two Inert Higgs Doublet Model
• Connecting the LHC diphoton excess to the Galatic center gamma-ray excess
• Dark matter cooling during early matter-domination boosts sub-earth halos
• Applying Simulation-Based Inference to Spectral and Spatial Information from the Galactic Center Gamma-Ray Excess
• TeV Gamma Rays From Galactic Center Pulsars
• Constraining Dwarf Spheroidal Dark Matter Halos With The Galactic Center Excess
• Optimal observing strategies for velocity-suppressed dark matter annihilation
• Detectability of dark matter density distribution via gravitational waves from binary black holes in the Galactic center
• Electron-positron pair production near the Galactic Centre and the 511 keV emission line
• Using dust to constrain dark matter models
• Deep Learning Models of the Discrete Component of the Galactic Interstellar Gamma-Ray Emission
• Einstein@Home Searches for Gamma-ray Pulsars in the Inner Galaxy
• An alternative Explanation for the Fermi GeV Gamma-Ray Excess
• Non-relativistic matter and Dark energy in a quantum conformal model
• Leptophilic Dark Matter in Direct Detection Experiments and in the Sun
• Numerical Simulations of the Dark Universe: State of the Art and the Next Decade
• Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)
• Indirect Dark Matter Searches and Models
• 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
• Impact of ATLAS constraints on effective dark matter-standard model interactions with spin-one mediators
• Possible counterpart signal of the Fermi bubbles at the cosmic-ray positrons
• $\mathcal{O}$(1) GeV dark matter in SUSY and a very light pseudoscalar at the LHC
• Fundamental Physics from the Sky: Cosmic Rays, Gamma Rays and the Hunt for Dark Matter
• Observations of the Fermi bubbles and the Galactic center excess with the DArk Matter Particle Explorer
• Interpretation of the Galactic gamma-ray excess with the dark matter indicated by ${}^8$Be and ${}^4$He anomalous transitions
• Dark Matter and Electroweak Baryogenesis with Spontaneous $CP$ Violation in the Early Universe
• Flares from Galactic centre pulsars: a new class of X-ray transients?
• The Galactic Isotropic $\gamma$-ray Background and Implications for Dark Matter
• Are we really seeing dark matter signals from the Milky Way center?
• Investigating the dark matter minispikes with the gamma-ray signal from the halo of M31
• Closing in on the Wino LSP via trilepton searches at the LHC
• On the Energy Distribution of the Galactic Center Excess' Sources
• Extended Higgs-portal dark matter and the Fermi-LAT Galactic Center Excess
• Blois 2019: highlights and outlook
• Informational corrections to the early-Universe radiation sector: CET Omega, WIMP freeze-out, and implications for a possible 20 GeV gamma-ray excess
• The Density of Dark Matter in the Galactic Bulge and Implications for Indirect Detection
• A GeV-TeV particle component and the barrier of cosmic-ray sea in the Central Molecular Zone
• GeV excess and phenomenological astrophysics modeling
• On the morphology of $\gamma -$ray emission induced by $e^{\pm }$ from annihilating self-interacting dark matter
• Theoretical and phenomenological consequences of active and sterile neutrino within Beyond Standard Model framework
• Millisecond Pulsars in Globular Clusters and Implications for the Galactic Center Gamma-Ray Excess
• Limits on Dark Matter Annihilation from the Shape of Radio Emission in M31
• Implications of the Fermi-LAT Pass 8 Galactic Center Excess on Supersymmetric Dark Matter
• Dark matter properties implied by gamma ray interstellar emission models
• Spin-one dark matter and gamma ray signals from the galactic center
• On a possible origin of the gamma-ray excess around the Galactic Center
• New energy spectra in neutrino and photon detectors to reveal hidden dark matter signals
• Extragalactic Searches for Dark Matter Annihilation
• Analysis of shape and angular orientation parameters of velocity-dependent dark matter annihilation signals in Galactic Centers for FIRE simulations
• Dark Matter Phenomenology: Sterile Neutrino Portal and Gravitational Portal in Extra-Dimensions
• The contribution to Galactic Centre γ-ray excess from cluster-born millisecond pulsars. Constraints from direct N-body simulations
• Probing Bottom-flavored Scalar Dark Matters at Loop Level
• Exploring the nature of Galactic unassociated sources detected by the Fermi-LAT
• Probing the millisecond pulsar origin of the $\gamma$-ray excess in the Galactic centre with LISA
• Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X
• Sensitivity to keV-MeV dark matter from cosmic-ray scattering with current and the upcoming ground-based arrays CTA and SWGO
• Searching for dark matter annihilation in the Sun with the IceCube Upgrade
• Measurement of High Energy Gamma Rays from 200 MeV to 1 TeV with the Alpha Magnetic Spectrometer on the International Space Station
• What Can Gamma-rays from Space tell us About the Madala Hypothesis?
• Exotic Decays of Heavy B quarks
• Assessing the Impact of Hydrogen Absorption on the Characteristics of the Galactic Center Excess