AAS 197, January 2001
Session 72. Cosmology from z=1100 to 1
Display, Wednesday, January 10, 2001, 9:30am-7:00pm, Exhibit Hall

## [72.05] Numerical radiative transfer in cosmology: from reionization to Ly\alpha systems

A.O. Razoumov, M.L. Norman (UCSD)

We present results from new 3D cosmological radiative transfer models computed on top of two simulated datasets in a SCDM cosmology. The spatial scale covered by present simulations ranges from zones of influence'' of bright quasars (few tens of Mpc) down to the size of individual protogalaxies (few kpc). We solve the frequency-dependent radiative transfer equation explicitly, taking into account scattering of photons in an evolving 3D clumpy medium. One of the current projects is to investigate the effect of varying angular resolution for the diffuse part of the radiation field, as well as the effect of high-energy photons using runs with variable spectral resolution at h\nu > 54{\rm eV} eV, and compare different computational models of preheating by soft (h\nu < 13.6{\rm eV}) photons. The data from these simulations can be further used in modeling the statistics of atomic hydrogen 21 cm features from the high-redshift gas during patchy reionization, as well as accounting for radiative transfer effects in Ly\alpha systems.