Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Feb 6, 2014
Conference on Origins of the Expanding Universe: 1912-1932 Sep 14-15, 2012 - Lowell Observatory
Presentation 1.10 Chris Impey A Century of Galaxy Redshifts -- From a Few Dozen to Millions
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 Slipher's era to harvesting of tens of thousands of precision CCD redshifts each night. Advances in detector technology and a new generation of large telescopes have driven this change, which maps into a transformation in our view of the expanding universe, from simple detection of linear flow to exquisitely detailed measurement of a filigree of large scale structure imprinted on a decelerating then acceleration expansion. This talk will focus on the innovations that occurred along the way, some technical and some involving the clever use of proxies for, or adjuncts to, collections of stars such as supermassive black holes, supernovae, and gamma ray bursts.