Wouthuysen-Field Coupling in the 21 cm Region Around High Redshift Sources

The 21 cm emission and absorption from gaseous halos around the first generation of star depend on the Wouthuysen-Field (W-F) coupling, which relates the spin temperature with the kinetic temperature of hydrogen gas via the resonant scattering between Lyman alpha photons and neutral hydrogen. Although the center object generally is... Show more