Galaxies. Our Galaxy (CP Fig 19.1a) Our Galaxy (CP Fig 19.1b)

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Presentation transcript:

Galaxies

Our Galaxy (CP Fig 19.1a)

Our Galaxy (CP Fig 19.1b)

Orbits of stars (CP Fig 19.18)

Spectral lines viewed through diffraction grating Redshift Blueshift Observing Galactic Rotation

The result: A rotation curve NB, there is an overall net redshift due the the cosmic expansion.

Rotation Curves

1996

Mass inferred from lensing: Must have dark matter

Theoretical studies of Galaxies Images and movies from the Virgo consortium Another Virgo Link Galaxy collision movies

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