The effect of primordial black holes on 21-cm fluctuations

  title={The effect of primordial black holes on 21-cm fluctuations},
  author={Hiroyuki Tashiro and Naoshi Sugiyama},
  journal={Monthly Notices of the Royal Astronomical Society},
The 21 cm signal produced by non-evaporating primordial black holes (PBHs) is investigated. X-ray photons emitted by accretion of matter onto a PBH ionize and heat the intergalactic medium (IGM) gas near the PBH. Using a simple analytic model, we show that this X-ray heating can produce an observable differential 21 cm brightness temperature. The region of the observable 21 cm brightness temperature can extend to 1-10 Mpc comoving distance from a PBH depending on the PBH mass. The angular power… 

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