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Galactic Bulge Preferred Over Dark Matter for the Galactic Center Gamma-Ray Excess
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An anomalous gamma-ray excess emission has been found in Fermi Large Area Telescope data covering the centre of the Galaxy. Several theories have been proposed for this `Galactic Centre Excess'. They include self-annihilation of dark matter particles, an unresolved population of millisecond pulsars, an unresolved population of young pulsars, or a series of burst events. Here we report on a new analysis that exploits hydrodynamical modelling to register the position of interstellar gas associated with diffuse Galactic gamma-ray emission. We find evidence that the Galactic Centre Excess gamma rays are statistically better described by the stellar over-density in the Galactic bulge and the nuclear stellar bulge, rather than a spherical excess. Given its non-spherical nature, we argue that the Galactic Centre Excess is not a dark matter phenomenon but rather associated with the stellar population of the Galactic bulge and nuclear bulge.
Forward citations
Cited by 3 Pith papers
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Galactic Center gamma-ray excess from a generic triaxial halo
Fermi-LAT fits show the Galactic Center gamma-ray excess keeps its spectrum and cuspiness under triaxial/tilted dark matter halo templates, but its morphology prefers a flipped-tilt halo and disfavors a stellar-halo profile.
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Stellar-like Galactic center excess challenges particle dark matter
A mixed stellar-bulge and dark-matter fit to Fermi-LAT Galactic Center data yields upper limits on the annihilation cross section that reach the thermal relic line for masses ≲300 GeV under a contracted NFW halo profile.
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Fermi-LAT Galactic Center Excess morphology of dark matter in simulations of the Milky Way galaxy
The manuscript body is a different paper (b → c semileptonic sum rules) and contains none of the claimed dark matter gamma-ray morphology analysis, so the abstract's prediction is unsupported.
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