Non-cosmological redshifts of spectral lines

  title={Non-cosmological redshifts of spectral lines},
  author={Emil Wolf},
  • E. Wolf
  • Published 26 March 1987
  • Physics
  • Nature
We showed in a recent report1 (see also refs 2–4) that the normalized spectrum of light will, in general, change on propagation in free space. We also showed that the normalized spectrum of light emitted by a source of a well-defined class will, however, be the same throughout the far zone if the degree of spectral coherence of the source satisfies a certain scaling law. The usual thermal sources appear to be of this kind. These theoretical predictions were subsequently verified by experiments5… 
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