CONNECTING REIONIZATION TO THE LOCAL UNIVERSE

Connecting Reionization to the Local Universe

We present results of combined N-body and three-dimensional reionization calculations to determine the relationship between reionization history and local environment in a volume 1 Gpc h−1 across and a resolution of about 1 Mpc. We resolve the formation of about 2× 106 halos of mass greater than ∼ 10M⊙ at z = 0, allowing us to determine the relationship between halo mass and reionization epoch ...

Reionization of the early Universe

On the Reionization of the Universe

I present first principle model calculations for the reionization of the Universe, which provide simple diagnostics to identify the reionization sources. Within this frame, I also discuss the results derived from the Hubble Ultra-Deep Field observations, and the possible need for future observations with JWST to provide the final answer.

Signatures of Stellar Reionization of the Universe

The high ionization level and non-zero metallicity (∼ 1% Z ⊙) of the intergalactic gas at redshifts z ∼ < 5 implies that nonlinear structure had started to form in the universe at earlier times than we currently probe. In Cold Dark Matter (CDM) cosmologies, the first generation of baryonic objects emerges at redshifts z ∼ 10–50. Here we examine the observable consequences of the possibility tha...

Evidence for inhomogeneous reionization in the local Universe from metal-poor globular cluster systems

Exploiting a fundamental characteristic of galaxy assembly in the Λ cold dark matter paradigm, the observed spatial biasing and kinematics of metal-poor globular star clusters are used to constrain the local reionization epoch around individual galaxies. Selecting three galaxies located in different environments, the first attempt at constraining the environmental propagation of reionization in...