Galaxies and Cosmology

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Presentation transcript:

Galaxies and Cosmology Key figures in relativistic cosmology Friedman de Sitter Einstein Lemaitre

General Relativity

The Galaxy

The Galaxy

Distances SMC by Fred Espenak

The Expanding Universe

The Expanding Universe Hubble and Humason, 1931

The Steady State

The Less Rapidly Expanding Universe... part 1 MB = -4.35 log P + 3.98 MB = -1.33 log P + 0.24 MB = -2.59 log P - 0.67 W Vir stars (Type II Cepheids) – magnitude of about -1 at log P = 1 m – M = 5 log(d/10) If ΔM = 2, d changes by factor of 102/5 = 2.5 Classical (Type I) Cepheids – magnitude of about -3 at log P = 1

The Less Rapidly Expanding Universe... part 2 red plate; H II regions marked blue plate; star marked Allan Sandage, ApJ 127 (1958) 123

Hubble’s (not-very) Constant Sandage recognises HII regions (not stars) Jan Oort Baade discovers Pop II

Radio Source Counts

Cosmic Background Wilkinson Peebles Dicke Herman – Gamow – Alpher Wilson Penzias Wilkinson Peebles Dicke

Cosmic Background Boynton, Stokes & Wilkinson, 1968 COBE satellite, 1990

Big Bang Nucleosynthesis Wagoner, Fowler and Hoyle (1967)

Hubble Wars Gerard de Vaucouleurs Allan Sandage

Hubble Peace?

Hubble Peace?

Inflation

CMB Anisotropies David Spergel