Astr 328 Feb 24, 2003: High-redshift galaxies and dark matter in clusters  

Search strategies for high-redshift galaxies

Red herrings: faint blue galaxies

Direct searches in the field: Lyman series

Lyman alpha emission and Lyman limit systems

Spectral energy distributions of high-redshift galaxies

Redshift 3.15 galaxy spectrum

Properties of Lyman break galaxies

Hubble deep fields

Volume and time probed by Hubble deep fields

Number of peculiar galaxies rises with z

Redshift distribution of Lyman break galaxies (1997)

IR observations confirm peculiarity result

Smaller angular diameters

Dark matter: possibilities

Dark matter in clusters: virial theorem

Virial theorem complications

Hydrostatic equilibrium and Xray gas

Measurements needed

More hot gas than galaxies; more dark matter than gas

Gravitational lensing

Independent checks

Grav lensing math

Lensing diagram

Critical surface density

Strong and weak lensing regimes

Strong and weak lensing illustrations

Derived cluster mass distributions

Summary of dark matter estimates for clusters