A Tale of Tails. Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
Abstract
Several groups have identified an extended excess of gamma rays over the modeled foreground and background emissions towards the Galactic center (GC) based on observations with the Fermi Large Area Telescope. The excess emission is compatible in morphology and spectrum with a telltale sign from dark matter (DM) annihilation. Here, we present a critical reassessment of DM interpretations of the GC signal in light of the foreground and background uncertainties that some of us recently outlaid in Calore et al. (2014). We also find that a much larger number of DM models fits the gamma-ray data than previously noted. In particular: (1) In the case of DM annihilation into b¯b, we find that even large DM masses up to mχ≃74 GeV are allowed at p-value >0.05. (2) Surprisingly, annihilation into nonrelativistic hh gives a good fit to the data. (3) The inverse Compton emission from μ+μ- with mχ~60–70 GeV can also account for the excess at higher latitudes, |b|>2°, both in its spectrum and morphology. We also present novel constraints on a large number of mixed annihilation channels, including cascade annihilation involving hidden sector mediators. Finally, we show that the current limits from dwarf spheroidal observations are not in tensionmore »
- Authors:
-
- Univ. of Amsterdam (Netherlands)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1234866
- Alternate Identifier(s):
- OSTI ID: 1180159
- Report Number(s):
- FERMILAB-PUB-14-477-A
Journal ID: ISSN 1550-7998; arXiv eprint number arXiv:1411.4647
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D, Particles, Fields, Gravitation and Cosmology
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 06; Journal ID: ISSN 1550-7998
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Calore, Francesca, Cholis, Ilias, McCabe, Christopher, and Weniger, Christoph. A Tale of Tails. Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics. United States: N. p., 2015.
Web. doi:10.1103/PhysRevD.91.063003.
Calore, Francesca, Cholis, Ilias, McCabe, Christopher, & Weniger, Christoph. A Tale of Tails. Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics. United States. https://doi.org/10.1103/PhysRevD.91.063003
Calore, Francesca, Cholis, Ilias, McCabe, Christopher, and Weniger, Christoph. Tue .
"A Tale of Tails. Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics". United States. https://doi.org/10.1103/PhysRevD.91.063003. https://www.osti.gov/servlets/purl/1234866.
@article{osti_1234866,
title = {A Tale of Tails. Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics},
author = {Calore, Francesca and Cholis, Ilias and McCabe, Christopher and Weniger, Christoph},
abstractNote = {Several groups have identified an extended excess of gamma rays over the modeled foreground and background emissions towards the Galactic center (GC) based on observations with the Fermi Large Area Telescope. The excess emission is compatible in morphology and spectrum with a telltale sign from dark matter (DM) annihilation. Here, we present a critical reassessment of DM interpretations of the GC signal in light of the foreground and background uncertainties that some of us recently outlaid in Calore et al. (2014). We also find that a much larger number of DM models fits the gamma-ray data than previously noted. In particular: (1) In the case of DM annihilation into b¯b, we find that even large DM masses up to mχ≃74 GeV are allowed at p-value >0.05. (2) Surprisingly, annihilation into nonrelativistic hh gives a good fit to the data. (3) The inverse Compton emission from μ+μ- with mχ~60–70 GeV can also account for the excess at higher latitudes, |b|>2°, both in its spectrum and morphology. We also present novel constraints on a large number of mixed annihilation channels, including cascade annihilation involving hidden sector mediators. Finally, we show that the current limits from dwarf spheroidal observations are not in tension with a DM interpretation when uncertainties on the DM halo profile are accounted for.},
doi = {10.1103/PhysRevD.91.063003},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 06,
volume = 91,
place = {United States},
year = {Tue Mar 10 00:00:00 EDT 2015},
month = {Tue Mar 10 00:00:00 EDT 2015}
}
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Fermi-LAT Observations of Gamma-Ray Emission Towards the Outer Halo of M31
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NMSSM explanations of the Galactic center gamma ray excess and promising LHC searches
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Planck 2015 results. XIII. Cosmological parameters
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The Effects of QCD Equation of State on the Relic Density of WIMP Dark Matter
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The Galactic Center GeV Excess from a Series of Leptonic Cosmic-Ray Outbursts
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Probing a light CP-odd scalar in di-top-associated production at the LHC
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Is The Gamma-Ray Source 3FGL J2212.5+0703 A Dark Matter Subhalo?
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A review of indirect searches for particle dark matter
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Cosmological constraints on dark matter annihilation and decay: Cross-correlation analysis of the extragalactic $γ$-ray background and cosmic shear
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Boxes, Boosts, and Energy Duality: Understanding the Galactic-Center Gamma-Ray Excess through Dynamical Dark Matter
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Exploring Cosmic Origins with CORE: Cosmological Parameters
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Interpretation of the gamma-ray excess and AMS-02 antiprotons: Velocity dependent dark matter annihilations
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The Dawn of FIMP Dark Matter: A Review of Models and Constraints
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Disrupted Globular Clusters and the Gamma-Ray Excess in the Galactic Centre
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Multi-Component Dark Matter: the vector and fermion case
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Ruling out dark matter interpretation of the galactic GeV excess by gamma-ray data of galaxy clusters
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Population syntheses of millisecond pulsars from the Galactic Disk and Bulge
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Probing the Fermi-LAT GeV excess with gravitational waves
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A Global Analysis of Dark Matter Signals from 27 Dwarf Spheroidal Galaxies using 11 Years of Fermi-LAT Observations
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Ruling out $\sim 100-300$ GeV thermal relic annihilating dark matter by radio observation of the Andromeda galaxy
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Scrutinizing the evidence for dark matter in cosmic-ray antiprotons
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A Robust Excess in the Cosmic-Ray Antiproton Spectrum: Implications for Annihilating Dark Matter
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