Galactic Center GeV Excess

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Gamma-ray radiation (greater than 1 Gev) detected over the entire sky; brighter areas are more radiation (five year study by Fermi: 2009–2013)

The Galactic Center GeV Excess (GCE) is a surplus of gamma-ray radiation in the center of the Milky Way galaxy that is unexplained by direct observation.[1][2][3] As of 2019, this excessive (and diffused) gamma-ray radiation is not well understood by astronomers.[2] However, astronomers have suggested that self-annihilating dark matter may be a dominant contributor to the GCE, based on April 2019 experiments using non-Poissonian template fitting (NPTF) statistical methods,[3] and studies by other astronomers may support this idea.[4][5] Other hypotheses include ties to an unseen population of millisecond pulsars[6] or young pulsars, burst events, the stellar population of the galactic bulge,[7] or the Milky Way's central supermassive black hole.[1]

See also[edit]


  1. ^ a b Hooper, Dan & Goodenough, Lisa (21 March 2011). "Dark matter annihilation in the Galactic Center as seen by the Fermi Gamma Ray Space Telescope". Physics Letters B. 697 (5): 412–428. doi:10.1016/j.physletb.2011.02.029.
  2. ^ a b Starr, Michelle (30 April 2019). "Something's Glowing at The Heart of Our Galaxy, But It May Not Be What We Thought". Retrieved 30 April 2019.
  3. ^ a b Leane, Rebecca K. & Slatyer, Tracy R. (17 April 2019). "Dark Matter Strikes Back at the Galactic Center". arXiv:1904.08430v1 [astro-ph.HE].
  4. ^ Cuoco, Alessandro; et al. (4 March 2019). "Scrutinizing the evidence for dark matter in cosmic-ray antiprotons". Physical Review D. 99 (10): 103014. arXiv:1903.01472v1. doi:10.1103/PhysRevD.99.103014.
  5. ^ Cholis, Ilias; et al. (6 March 2019). "A Robust Excess in the Cosmic-Ray Antiproton Spectrum: Implications for Annihilating Dark Matter". Physical Review D. 99 (10): 103026. arXiv:1903.02549v1. doi:10.1103/PhysRevD.99.103026.
  6. ^ Bartels, Richard; et al. (February 2016). "Strong Support for the Millisecond Pulsar Origin of the Galactic Center GeV Excess". Physical Review Letters. 116 (5). 051102. arXiv:1506.05104. Bibcode:2016PhRvL.116e1102B. doi:10.1103/PhysRevLett.116.051102. PMID 26894696.
  7. ^ Macias, Oscar; et al. (12 March 2018). "Galactic bulge preferred over dark matter for the Galactic centre gamma-ray excess". Nature Astronomy. 2 (5): 387–392. Bibcode:2018NatAs...2..387M. doi:10.1038/s41550-018-0414-3.

Further reading[edit]