Galaxies and Cosmology

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Galaxies and Cosmology
Key figures in relativistic cosmology Friedman
de Sitter Einstein Lemaitre
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General Relativity
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The Galaxy
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The Galaxy
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Distances
SMC by Fred Espenak
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The Expanding Universe
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The Expanding Universe
Hubble and Humason, 1931
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The Steady State
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The Less Rapidly Expanding Universe... part 1
W Vir stars (Type II Cepheids) magnitude of
about -1 at log P 1 m M 5 log(d/10) If
?M 2, d changes by factor of 102/5
2.5 Classical (Type I) Cepheids magnitude of
about -3 at log P 1
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The Less Rapidly Expanding Universe... part 2
red plate H II regions marked
blue plate star marked
Allan Sandage, ApJ 127 (1958) 123
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Hubbles (not-very) Constant
Sandage recognises HII regions (not stars)
Jan Oort
Baade discovers Pop II
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Radio Source Counts
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Cosmic Background
Herman Gamow Alpher Wilson Penzias
Wilkinson Peebles Dicke
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Cosmic Background
Boynton, Stokes Wilkinson, 1968
COBE satellite, 1990
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Big Bang Nucleosynthesis
Wagoner, Fowler and Hoyle (1967)
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Hubble Wars
Gerard de Vaucouleurs
Allan Sandage
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Hubble Peace?
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Hubble Peace?
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Inflation
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CMB Anisotropies
David Spergel