Deriving accurate peculiar velocities (even at high redshift)

Tracing large-scale structure at high redshift with Lyman-α emitters: the effect of peculiar velocities

We investigate the effect of peculiar velocities on the redshift space distribution of z >∼ 2 galaxies, and we focus in particular on Lyα emitters. We generate catalogues of dark matter (DM) halos and identify emitters with halos of the same comoving space density (M(Lyα emitters) ≈ 3× 1011M⊙). We decompose the peculiar velocity field of halos into streaming, gradient and random components, and...

Peculiar Velocities of Galaxy Clusters

We investigate the peculiar velocities predicted for galaxy clusters by theories in the cold dark matter family. A widely used hypothesis identifies rich clusters with high peaks of a suitably smoothed version of the linear density fluctuation field. Their peculiar velocities are then obtained by extrapolating the similarly smoothed linear peculiar velocities at the positions of these peaks. We...

Peculiar Velocities of Galaxy Clusters 32 LINEAR PREDICTIONS FOR THE PECULIAR VELOCITIES

We investigate the peculiar velocities predicted for galaxy clusters by theories in the cold dark matter family. A widely used hypothesis identiies rich clusters with high peaks of a suitably smoothed version of the linear density uctuation eld. Their peculiar velocities are then obtained by extrapolating the similarly smoothed linear peculiar velocities at the positions of these peaks. We test...

Galaxies at High Redshift

Galaxies at High Redshift

Within just the last few years, we have advanced from knowing only a few galaxies at z > 2 to having redshifts for nearly 1000 z ∼ 2–5 objects. The majority of this sample has been detected through the photometric “dropout” technique used so successfully by Steidel and his collaborators. In addition, a handful of objects have already been detected at z > 5, and we may already have a few objects...