Galaxy Selection and Clustering and Lyα Absorber Identification

Lyα ABSORBER CORRELATIONS AND THE “BIAS” OF THE Lyα FOREST

Lyα absorber correlations contain information about the underlying density distribution associated with a particular class of absorbers. As such, they provide an opportunity to independently measure the “bias” of the Lyman alpha forest, i.e. the relationship between H I column density and underlying dark matter density. In these proceedings we use hydrodynamic simulations to investigate whether...

DAMPED Lyα ABSORBER AND THE FAINT END OF THE GALAXY LUMINOSITY FUNCTION AT HIGH REDSHIFT

We combine predictions for several hierarchical cosmogonies with observational evidence on damped Lyα systems to establish a correspondence between the high redshift galaxy population and the properties of damped Lyα systems (DLAS). We assume that high redshift galaxies and damped Lyα systems are hosted by the same dark matter halos and require consistency between the predicted halo space densi...

Reionization and Galaxy Evolution Probed by Z = 7 Lyα Emitters

We made a narrowband NB973 (bandwidth of 200Å centered at 9755Å) imaging of the Subaru Deep Field (SDF) and found two z = 7 Lyα emitter (LAE) candidates down to NB973 = 24.9. Carrying out deep follow-up spectroscopy, we identified one of them as a real z = 6.96 LAE. This has established a new redshift record, showing that galaxy formation was in progress just 750 Myr after the Big Bang. Meanwhi...

The Galaxy–Absorber Cross-Correlation Function

We describe an analysis of the galaxy–absorber cross-correlation function ξga(v, ρ) as a function of velocity separation v, impact parameter separation ρ, and absorber Lyα equivalent width W on impact parameter scales that extend up to ≈ 1 h Mpc.

Identification of a Galaxy Responsible for a High-Redshift Damped Lyα Absorption System