The formation and gas content of high redshift galaxies and minihalos

摘要: We investigate the suppression of baryon density fluctuations compared to dark matter in linear regime. Previous calculations predict that occurs up a characteristic mass scale ~ 1,000,000 solar masses, which suggests pressure has central role determining properties first luminous objects at early times. show expected is fact substantially lower (by factor 3-10, depending on redshift), and thus effect baryonic formation galaxies reionization only moderate. This result due influence perturbation growth high prevailed period from cosmic recombination z 200, when gas began cool adiabatically then dropped. At 10 still sensitive history this high-redshift era. calculate fraction minihalos find it higher than would be with previously-estimated mass. Expanding our investigation non-linear regime, we detail spherical collapse Lambda-CDM universe. include gravitational contributions baryons radiation memory their kinematic coupling before recombination. use results more accurate halo function as redshift.