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Excess of EGRET Galactic Gamma Ray Data interpreted as Dark Matter Annihilation
Astrophysics · Submitted 15 Aug 2004
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The latter combined with all features mentioned above provides an intriguing hint that the EGRET excess is indeed a signal from Dark Matter Annihilation.
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The abstract, sentence by sentence
The diffuse galactic EGRET gamma ray data show a clear excess for energies above 1 GeV in comparison with the expectations from conventional galactic models. The excess is seen with the same spectrum in all sky directions, as expected for Dark Matter (DM) annihilation. This hypothesis is investigated in detail. The energy spectrum of the excess is used to limit the WIMP mass to the 50-100 GeV range, while the sky maps are used to determine the halo structure, which is consistent with a triaxial isothermal halo with additional enhancement of Dark Matter in the disc. The latter is strongly correlated with the ring of stars around our galaxy at a distance of 14 kpc, thought to originate from the tidal disruption of a dwarf galaxy. It is shown that this ring of DM with a mass of $\approx 2\cdot 10^{11} M_\odot$ causes the mysterious change of slope in the rotation curve at $R=1.1R_0$ and the large local surface density of the disc. The total mass of the halo is determined to be $3\cdot 10^{12} M_\odot$. A cuspy profile is definitely excluded to describe the gamma ray data. These signals of Dark Matter Annihilation are compatible with Supersymmetry for boost factors of 20 upwards and have a statistical significance of more than $10\sigma$ in comparison with the conventional galactic model. The latter combined with all features mentioned above provides an intriguing hint that the EGRET excess is indeed a signal from Dark Matter Annihilation.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The diffuse galactic EGRET gamma ray data show a clear excess for energies above 1 GeV in comparison with the expectations from conventional galactic models. | result 0.73 | 0.45 | 0.07 | asserted 1.00 |
| s1 | The excess is seen with the same spectrum in all sky directions, as expected for Dark Matter (DM) annihilation. | interpretation 0.65 | 0.61 | 0.13 | asserted 0.95 |
| s2 | This hypothesis is investigated in detail. | contribution 0.89 | 0.49 | 0.03 | unclear 0.61 |
| s3 | The energy spectrum of the excess is used to limit the WIMP mass to the 50-100 GeV range, while the sky maps are used to determine the halo structure, which is consistent with a triaxial isothermal halo with additional enhancement of Dark Matter in the disc. | result 0.97 | 0.88 | 0.18 | asserted 0.75 |
| s4 | The latter is strongly correlated with the ring of stars around our galaxy at a distance of 14 kpc, thought to originate from the tidal disruption of a dwarf galaxy. | result 0.70 | 0.40 | 0.05 | asserted 0.51 |
| s5 | It is shown that this ring of DM with a mass of $\approx 2\cdot 10^{11} M_\odot$ causes the mysterious change of slope in the rotation curve at $R=1.1R_0$ and the large local surface density of the disc. | result 0.71 | 0.77 | 0.08 | asserted 1.00 |
| s6 | The total mass of the halo is determined to be $3\cdot 10^{12} M_\odot$. | result 1.00 | 0.87 | 0.07 | asserted 1.00 |
| s7 | A cuspy profile is definitely excluded to describe the gamma ray data. | result 1.00 | 0.85 | 0.06 | asserted 1.00 |
| s8 | These signals of Dark Matter Annihilation are compatible with Supersymmetry for boost factors of 20 upwards and have a statistical significance of more than $10\sigma$ in comparison with the conventional galactic model. | result 0.74 | 0.82 | 0.22 | asserted 0.58 |
| s9 | The latter combined with all features mentioned above provides an intriguing hint that the EGRET excess is indeed a signal from Dark Matter Annihilation. | interpretation 1.00 | 0.69 | 0.86 | hedged possibility 0.99 |
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The paper
Original abstract
The diffuse galactic EGRET gamma ray data show a clear excess for energies above 1 GeV in comparison with the expectations from conventional galactic models. The excess is seen with the same spectrum in all sky directions, as expected for Dark Matter (DM) annihilation. This hypothesis is investigated in detail. The energy spectrum of the excess is used to limit the WIMP mass to the 50-100 GeV range, while the sky maps are used to determine the halo structure, which is consistent with a triaxial isothermal halo with additional enhancement of Dark Matter in the disc. The latter is strongly correlated with the ring of stars around our galaxy at a distance of 14 kpc, thought to originate from the tidal disruption of a dwarf galaxy. It is shown that this ring of DM with a mass of $\approx 2\cdot 10^{11} M_\odot$ causes the mysterious change of slope in the rotation curve at $R=1.1R_0$ and the large local surface density of the disc. The total mass of the halo is determined to be $3\cdot 10^{12} M_\odot$. A cuspy profile is definitely excluded to describe the gamma ray data. These signals of Dark Matter Annihilation are compatible with Supersymmetry for boost factors of 20 upwards and have a statistical significance of more than $10\sigma$ in comparison with the conventional galactic model. The latter combined with all features mentioned above provides an intriguing hint that the EGRET excess is indeed a signal from Dark Matter Annihilation.
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References
How the literature uses it
8 arXiv papers cite this in 10 sentences
Papers whose main result relates to this one's
States the same result 3 papers
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The statistical significance combined with all features mentioned above provide an intriguing hint that the EGRET excess is indeed a signal from Dark Matter Annihilation.
EGRET Excess of Galactic Gamma Rays as Signal of Dark Matter Annihilation · 1.00
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The latter combined with all features mentioned above provides an intriguing hint that the EGRET excess is indeed indirect evidence for Dark Matter Annihilation.
Evidence for Dark Matter Annihilation from Galactic Gamma Rays? · 1.00
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The statistical significance combined with all features mentioned above provide an intriguing hint that the EGRET excess is indeed a signal from Dark Matter Annihilation.
Indirect Evidence for WIMP Annihilation from Diffuse Galactic Gamma Rays · 1.00
Discussion
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