Download - 3.1 Cosmic Distance Ladder. From these methods: Determine distance (see p 615 including Fig 20.16)
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3.1 Cosmic Distance Ladder
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From these methods: Determine distance (see p 615 including Fig 20.16)
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From these methods: Determine distance (see p 626 including Fig 20.16)
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From these methods: Determine distance (see p 626 including Fig 20.16)
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Given luminosity infer distance (see p 626 including Fig 20.16)
Use surface temperature of “main sequence stars” to infer Luminosity.
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Use pulsation period of variable starts (“Cepheids”) to infer luminosity
Given luminosity infer distance (see p 626 including Fig 20.16)
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Given luminosity infer distance (see p 626 including Fig 20.16)
Use “Tully-Fisher relation” to infer galaxy luminosity from rotation speed
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Given luminosity infer distance (see p 626 including Fig 20.16)
Use “Tully-Fisher relation” to infer galaxy luminosity from rotation speed
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From these methods: Determine distance (see p 641)
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3.2 The Redshift
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Fig 20.15A redshifted galaxy spectrum
observed rest
rest
z
Redshift:
For small z v c z
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3.3 The Hubble law
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Putting together info about speed v and distance d reveals
remarkably simple behavior:
0v H d
0 65H Km/Sec/Megaparsec
1 Megaparsec = 3.3 million lightyears
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Special feature of the Hubble law: It looks the same from any position:
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The Big Bang
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