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Zwicky: a dynamical mass discrepancy in the Coma cluster

Zwicky compared Coma's large observed velocity spread with gravitational estimates based on luminous matter, identifying a mass discrepancy under explicit cluster-model assumptions.

What is recorded here?

Zwicky compared Coma's large observed velocity spread with gravitational estimates based on luminous matter, identifying a mass discrepancy under explicit cluster-model assumptions. The motion of galaxies supplied information that brightness alone could not. A stationary virial estimate suggested substantially more gravitating matter than the adopted luminous estimate; the paper also considered departures from equilibrium and apparent-redshift alternatives, leaving a concrete unresolved problem.

Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.

Scientific scope

The target is section 5 of the 1933 paper, checked in the original German and a later translation. Stationarity, approximate uniform distribution, historical distances/masses and interpreting redshifts as velocities are model inputs. The paper's numerical density factor is a historical estimate, not a modern recalibration or independently replayed measurement. Its conclusion is conditional and calls the cluster dispersion unresolved; no dark-matter particle detection, proof of nonbaryonic composition or endorsement of the separate tired-light/cosmic-ray proposals is claimed. Earlier mass-deficit work and later observations retain separate credit; priority as the universal first use of dark matter is not asserted.

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People and systems

Fritz Zwicky

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English catalogue narrative

Zwicky: a dynamical mass discrepancy in the Coma cluster

Zwicky compared Coma's large observed velocity spread with gravitational estimates based on luminous matter, identifying a mass discrepancy under explicit cluster-model assumptions.

The motion of galaxies supplied information that brightness alone could not. A stationary virial estimate suggested substantially more gravitating matter than the adopted luminous estimate; the paper also considered departures from equilibrium and apparent-redshift alternatives, leaving a concrete unresolved problem.

Scientific scope

The target is section 5 of the 1933 paper, checked in the original German and a later translation. Stationarity, approximate uniform distribution, historical distances/masses and interpreting redshifts as velocities are model inputs. The paper's numerical density factor is a historical estimate, not a modern recalibration or independently replayed measurement. Its conclusion is conditional and calls the cluster dispersion unresolved; no dark-matter particle detection, proof of nonbaryonic composition or endorsement of the separate tired-light/cosmic-ray proposals is claimed. Earlier mass-deficit work and later observations retain separate credit; priority as the universal first use of dark matter is not asserted.

People and systems

Fritz Zwicky

Original sources