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| Paper: |
Galaxy Redshifts: From Dozens to Millions |
| Volume: |
471, Origins of the Expanding Universe: 1912-1932 |
| Page: |
289 |
| Authors: |
Impey, C. |
| Abstract: |
The measurement of galaxy redshifts has changed almost beyond recognition in the
past hundred years, progressing from night-long photographic exposures of single
targets in the Vesto Slipher era to harvesting tens of thousands of precision
CCD redshifts each night. Advances in detector technology and a new generation
of 6 to 10 m telescopes have driven this change. The result is a transformation
that maps into a transformation in our view of the expanding universe, from the
simple detection of linear flow to exquisitely detailed measurement of a
filigree of large scale structure imprinted on a decelerating then accelerating
expansion. Many innovations have occurred along the way, some technical and some
involving the clever use of proxies for, or adjuncts to, collections of stars
for distance measurements to go with redshift. The most useful tools have proved
to be supermassive black holes, supernovae, and gamma ray bursts. |
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