23_-_Normal_Galaxies - 23 - Normal Galaxies (1) The Plan...

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23 - Normal Galaxies (1) Henrietta Levitt 1907 (Harvard) 2 The Plan • Survey galaxies at large distances. OK, • How do we measure large distances? 3 4 Virgo Cluster: Elliptical Galaxies
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5 Hercules Cluster: Spirals 6 M81 Spiral 7 M87 Elliptical 8 Detailed Properties • Distances • Composition • Shape 3-D • Star Formation • Ages • Evolution • Forming and/or Merging
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9 Distance: The Most Important Thing • RADAR (Radio Detection And Ranging) • Parallax • Moving clusters • Main Sequence fitting • Galaxies – Cepheid variables – Faber-Jackson (ellipticals) – Tully-Fisher (spirals) – Type Ia supernovae (standard candles) • Redshift 10 RADAR • The parallax method requires knowledge of the AU. • The classical methods of measuring the parallax of the Sun. • Radar is a far better way to go. • The LADAR can measure the distance to the Moon to about 4cm. • The planets are less well known but by far
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23_-_Normal_Galaxies - 23 - Normal Galaxies (1) The Plan...

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