Millisecond pulsars cannot account for the inner Galaxy’s GeV excess

摘要: Using data from the Fermi Gamma-Ray Space Telescope, a spatially extended component of gamma rays has been identified direction Galactic center, peaking at energies ∼2–3  GeV. More recently, it shown that this signal is not confined to innermost hundreds parsecs Galaxy, but instead extends least ∼3  kpc center. While spectrum, intensity, and angular distribution in good agreement with predictions annihilating dark matter, also suggested population unresolved millisecond pulsars could be responsible for excess GeV emission inner Galaxy. In paper, we consider later possibility detail. Comparing observed spectral shape Galaxy’s spectrum measured 37 by Fermi, find these sources exhibit much too soft sub-GeV accommodate signal. We construct models describe spatial luminosity function Milky Way’s pulsars. After taking into account constraints (including both known pulsars, unidentified which pulsars), can no more than ∼10% excess. Each arguments strongly disfavor as source