as2020: astronom ía contemporánea clase # 13 cosmología
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AS2020: Astronomía ContemporáneaClase # 13
Cosmología
• Profesor: José Maza Sancho
• 10 Noviembre 2010
Distances of Galaxies
• Radar ranging: Astronomical unit• Stellar parallax• Standard candles:• Main-sequence fitting
Cepheid Variables
• In 1912 Miss Henrietta Leavitt discovered the period-luminosity relation.
Type Ia Supernovae
• MB(max) ~ -19.5 (L ~ 5x109 Lo)
• MB(max) versus rate of decline
Hubble’s Law.
v Ho d
Distance Chain Summary
• Radar ranging• Parallax• Main-sequence fitting• Cepheid variables• Type Ia supernovae• Hubble’s law
How do distance measurements tell us the age of the universe.
• Age 12 ~ 15 billion years• Age (CMB) ~ 13.7 billion years
1
Ho
The Horizon of the Universe
How did galaxies form?
Galactic Collisions
NGC 4038 + 4039
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