Oklopcic & Hirata (2013)

ডিপথট থেকে

Abstract

  • Resonant scattering of Ly<math>\alpha</math> photons from intergalactic HI causes energy exchange between radiation field and gas.
  • Thus gas is heated due to recoil of the scattered atoms.
  • This Ly<math>\alpha</math> heating affects gas density, temperature and velocity perturbations.
  • Perturbations smaller than photon diffusion length are damped due to heat conduction by photons.
  • To find this length scale and the affect of Ly<math>\alpha</math> photons on perturbations gas heating rates need to be calculate.
  • This is calculated by numerically solving the linearized Boltzmann equation.
  • It turns out that perturbations add a small correction to the gas heating rate and
  • the damping of temperature perturbations occurs at scales much smaller than the relevant jeans scale, thus this effect will not be visible in EoR signal.