Galactic Center GeV Excess

The Galactic Center GeV Excess (GCE) is an unexpected surplus of gamma-ray radiation in the center of the Milky Way galaxy that is unexplained by direct observation.[1] As of 2019, this excessive (and diffused) gamma-ray radiation is not well understood by astronomers.[2][3] 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.[8]

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

Two percent of the gamma ray radiation in a 30° radius circle around the galactic center is attributed to the GCE. While some controversially argue that it might be radiation from dark matter (which is not otherwise known to radiate) or another exotic explanation, many believe that conventional objects such as pulsars could explain the GCE.[1]

See also

References
  1. Cho, Adrian (12 November 2019). "Physicists revive hunt for dark matter in the heart of the Milky Way". Science | AAAS. Retrieved 31 March 2020.
  2. Starr, Michelle (30 April 2019). "Something's Glowing at The Heart of Our Galaxy, But It May Not Be What We Thought". ScienceAlert.com. Retrieved 30 April 2019.
  3. Leane, Rebecca K. & Slatyer, Tracy R. (17 April 2019). "Dark Matter Strikes Back at the Galactic Center". Phys. Rev. Lett. 123 (24): 241101. arXiv:1904.08430v1. doi:10.1103/PhysRevLett.123.241101. PMID 31922851.
  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. Bibcode:2019PhRvD..99j3014C. 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. Bibcode:2019PhRvD..99j3026C. 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. arXiv:1611.06644. Bibcode:2018NatAs...2..387M. doi:10.1038/s41550-018-0414-3.
  8. 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. arXiv:1010.2752. Bibcode:2011PhLB..697..412H. doi:10.1016/j.physletb.2011.02.029.

Further reading
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