DISTANT GALAXIES AND COSMOLOGICAL MODELS

Edward J. Barlow
Member of National Academy of Engineering
Recipient of NASA Public Service Award
Previous member Report Review Committee of the National Research Council
Retired Vice President, Research & Development, Varian Associates

Reporting in the Press

Finally, when a statement is made in the press or a journal that a distant galaxy with such and such a redshift is such and such distance away and that we are seeing it when the universe was only so old we might ask:
  • What cosmological model is being used?
  • Is space flat or curved positively or negatively?
  • What concept of distance is being used?
  • If proper distance, is it distance now or distance then?
  • What value of H0 is being used?
  • Is the redshift treated as cosmological or Doppler?
  • What value of the cosmological constant is being used?
  • What is the assumed ratio of actual mass density to critical density?

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