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Is the velocity-distance relation for galaxies linear?

S van den Bergh1

  • 1Dominion Astrophysical Observatory, National Research Council, Victoria, Canada.

Proceedings of the National Academy of Sciences of the United States of America
|June 1, 1993
PubMed
Summary
This summary is machine-generated.

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Supergiant ScI galaxies and Type Ia supernovae are unsuitable as cosmic distance yardsticks. First-ranked cluster galaxies show minimal luminosity dispersion, suggesting a linear velocity-distance relationship with limited deviations.

Area of Science:

  • Astronomy and Astrophysics
  • Cosmology

Background:

  • Investigating the velocity-distance relationship is crucial for understanding cosmic expansion.
  • Standard candles and yardsticks are essential tools for cosmological measurements.

Purpose of the Study:

  • To evaluate ScI galaxies, Type Ia supernovae, and first-ranked cluster galaxies as potential standard candles for the velocity-distance relationship.
  • To determine the suitability of these objects for accurate cosmological distance measurements.

Main Methods:

  • Analysis of the diameters of ScI galaxies.
  • Examination of the luminosities of Type Ia supernovae at maximum light.
  • Assessment of the brightness of central galaxies in rich clusters.

Main Results:

Related Experiment Videos

  • Supergiant ScI galaxies exhibit significant luminosity variations, rendering them unsuitable.
  • Type Ia supernovae show luminosity differences up to a factor of 10, limiting their use as precise standard candles.
  • First-ranked cluster galaxies display a remarkably small luminosity dispersion, suggesting potential as reliable distance indicators.

Conclusions:

  • Neither ScI galaxies nor Type Ia supernovae are ideal for precise velocity-distance relationship studies.
  • First-ranked cluster galaxies offer a promising avenue for studying the velocity-distance relationship with minimal deviations (approx. 20%) up to redshifts of 40,000 km/s.