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A tentative gamma-ray line from Dark Matter annihilation at the Fermi Large Area Telescope
Open accessAbstract
The observation of a gamma-ray line in the cosmic-ray fluxes would be a smoking-gun signature for dark matter annihilation or decay in the Universe. We present an improved search for such signatures in the data of the Fermi Large Area Telescope (LAT), concentrating on energies between 20 and 300 GeV. Besides updating to 43 months of data, we use a new data-driven technique to select optimized target regions depending on the profile of the Galactic dark matter halo. In regions close to the Galactic center, we find a 4.6σ indication for a gamma-ray line at E γ ≈ 130 GeV. When taking into account the look-elsewhere effect the significance of the observed excess is 3.2σ. If interpreted in terms of dark matter particles annihilating into a photon pair, the observations imply a dark matter mass of m χ = 129.8±2.4 +7 −13 GeV and a partial annihilation cross-section of ⟨σ v ⟩ χχ → γγ = (1.27±0.32 +0.18 −0.28 ) × 10 −27 cm 3 s −1 when using the Einasto dark matter profile. The evidence for the signal is based on about 50 photons; it will take a few years of additional data to clarify its existence.
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Cites
A Universal Density Profile from Hierarchical Clustering
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Particle dark matter: evidence, candidates and constraints
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THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
Atwood, W. B., Abdo, A. A., Ackermann, M., Althouse, W., Anderson, B., Axelsson, M., Baldini, L., Ballet, J., Band, D. L., Barbiellini, G., et al. (2009) · The Astrophysical Journal · doi:10.1088/0004-637x/697/2/1071 · Cited by 4,198
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BackgroundTHE FERMI HAZE: A GAMMA-RAY COUNTERPART TO THE MICROWAVE HAZE
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“[68]).”
Cited by
Update on scalar singlet dark matter
Cline, J. M., Scott, P., Kainulainen, K., & Weniger, C. (2013) · Physical Review D · doi:10.1103/physrevd.88.055025 · Cited by 580
Self-citationTwo emission mechanisms in the Fermi Bubbles: A possible signal of annihilating dark matter
Hooper, D., & Slatyer, T. R. (2013) · Physics of the Dark Universe · doi:10.1016/j.dark.2013.06.003 · Cited by 331
Ackermann, M., Ajello, M., Albert, A., Anderson, B., Atwood, W. B., Baldini, L., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., et al. (2015) · Physical Review D · doi:10.1103/physrevd.91.122002 · Cited by 311
Fan, J., Katz, A., Randall, L., & Reece, M. (2013) · Physics of the Dark Universe · doi:10.1016/j.dark.2013.07.001 · Cited by 275
Metadata
- Authors
- Weniger, C.
- Venue
- Journal of Cosmology and Astroparticle Physics
- Publisher
- IOP Publishing
- Published
- 2012-08-07
- Volume
- 2012
- Issue
- 08
- Pages
- 007-007
- ISSN
- 1475-7508 (ISSN-L)
- 1475-7516
- OpenAlex
- W2108503425
- Cited by
- 394
- References
- 5
- FWCI
- 43.92
- Type
- journal article
- Language
- en
- Open access
- bronze
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