Strong constraints on thermal relic dark matter from Fermi-LAT observations of the Galactic Center

  title={Strong constraints on thermal relic dark matter from Fermi-LAT observations of the Galactic Center},
  author={Kevork N. Abazajian and Shunsaku Horiuchi and Manoj Kaplinghat and Ryan E. Keeley and Oscar Macias},
  journal={Physical Review D},
The extended excess toward the Galactic Center (GC) in gamma rays inferred from Fermi-LAT observations has been interpreted as being due to dark matter (DM) annihilation. Here, we perform new likelihood analyses of the GC and show that, when including templates for the stellar galactic and nuclear bulges, the GC shows no significant detection of a DM annihilation template, even after generous variations in the Galactic diffuse emission models and a wide range of DM halo profiles. We include… 

Identification of high-energy astrophysical point sources via hierarchical Bayesian nonparametric clustering

The light we receive from distant astrophysical objects carries information about their origins and the physical mechanisms that power them. The study of these signals, however, is complicated by the

Probing the Milky Way’s Dark Matter Halo for the 3.5 keV Line

We present a comprehensive search for the 3.5 keV line using ∼51 Ms of archival Chandra observations peering through the Milky Way’s dark matter halo from across the entirety of the sky, gathered via

The Continuum Dark Matter Zoo

: We generalize the recently proposed continuum dark matter model to the case where the dark matter consists of a spin-1 / 2 or spin-1 gapped continuum. We construct simple continuum analogs of

A Phantom Menace: On the Morphology of the Galactic Center Excess

The characteristics of the Galactic Center Excess (GCE) emission observed in gamma-ray energies – especially the morphology of the GCE – remain a hotly debated subject. The manner in which the

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Light bosonic dark matter can form gravitationally bound states known as boson stars. In this work, we explore a new signature of these objects interacting with the interstellar medium (ISM). We show

Gamma-ray emission from the Sagittarius dwarf spheroidal galaxy due to millisecond pulsars

The Fermi bubbles are giant, γ-ray-emitting lobes emanating from the nucleus of the Milky Way discovered in ~1–100 GeV data collected by the Large Area Telescope on board the Fermi Gamma-Ray Space

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Intriguing signals with excesses over expected backgrounds have been observed in many astrophysical and terrestrial settings, which could potentially have a dark matter origin. Astrophysical excesses

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To reveal natures of the dark matter (DM) particles, a γ-ray signal produced in annihilation processes of DM into the standard model particles has been one of the major probes. The crosscorrelation

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The increasing observational pressure on the standard cosmological model motivates analyses going beyond the paradigm of the collision-less cold dark matter (DM). Since the only clear evidence for



Foreground mismodeling and the point source explanation of the Fermi Galactic Center excess

The Fermi Large Area Telescope has observed an excess of $\ensuremath{\sim}\mathrm{GeV}$ energy gamma rays from the center of the Milky Way, which may arise from near-thermal dark matter

Observations of Milky Way Dwarf Spheroidal galaxies with the Fermi-LAT detector and constraints on Dark Matter models

We report on the observations of 14 dwarf spheroidal galaxie s with theFermi Gamma-Ray Space Telescope taken during the first 11 months of survey mod e operations. TheFermi telescope, which is

Testing the Sensitivity of the Galactic Center Excess to the Point Source Mask.

The first template fit using a mask based on the 4FGL catalog finds that the excess in gamma rays detected at the Galactic Center in Fermi-LAT data persists, and places strong constraints on any point source luminosity function capable of explaining the smooth emission identified in the template fit.

Characterizing the nature of the unresolved point sources in the Galactic Center: An assessment of systematic uncertainties

The Galactic Center Excess (GCE) of GeV gamma rays can be explained as a signal of annihilating dark matter or of emission from unresolved astrophysical sources, such as millisecond pulsars. Evidence

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Recent analyses of the excess of gamma-ray radiation emanating from the Galactic center (GC) region suggest an origin in a population of thousands of undetected millisecond pulsars (MSPs). We have

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Striking behavior consistent with a mismodeling effect in the real Fermi data is discovered, finding that large artificial injected dark matter signals are completely misattributed to point sources, concluding that dark matter may provide a dominant contribution to the GCE after all.

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The region around the Galactic Center (GC) is now well established to be brighter at energies of a few GeV than what is expected from conventional models of diffuse gamma-ray emission and catalogs of


The γ-ray sky >100 MeV is dominated by the diffuse emissions from interactions of cosmic rays with the interstellar gas and radiation fields of the Milky Way. Observations of these diffuse emissions