The Galactic Center GeV Excess (GCE) is an unexpected surplus of gamma-ray radiation in the center of the Milky Way galaxy. This spherical source of radiation was first detected in 2009[1][2] by the Fermi Gamma-ray Space Telescope and is unexplained by direct observation.[3] Two percent of the gamma ray radiation in a 30° radius circle around the galactic center is attributed to the GCE. Шаблон:As of, this excessive (and diffused) gamma-ray radiation is not well understood by astronomers.[4][5][6][7]
Some astronomers argue that self-annihilating dark matter (which is not otherwise known to radiate) may be the cause of the GCE, while others prefer a population of pulsars (which have not been observed) as the source.[8][3]
Astronomers have suggested that self-annihilating dark matter may be a dominant contributor to the GCE, based on analysis using non-Poissonian template fitting statistical methods,[5]wavelet methods,[7] and studies by other astronomers may support this idea.[9][10] More recently, in August 2020, other astronomers have reported that self-annihilating dark matter may not be the explanation for the GCE after all.[11][12] Other hypotheses include ties to a yet unseen population of millisecond pulsars[13][14] or young pulsars, burst events, the stellar population of the galactic bulge,[15] or the Milky Way's central supermassive black hole.[16]
