AWhat changed
Tully and Fisher developed and calibrated an extragalactic distance method connecting corrected global neutral-hydrogen profile width with intrinsic photographic luminosity or galaxy diameter, and applied it to nearby calibrators and two galaxy clusters.
Scientific scope
Tully and Fisher developed and calibrated an extragalactic distance method connecting corrected global neutral-hydrogen profile width with intrinsic photographic luminosity or galaxy diameter, and applied it to nearby calibrators and two galaxy clusters. The empirical relation connects specified galaxy luminosity and rotational line-width measures with calibration, inclination and sample assumptions. Scatter and selection effects limit individual distance estimates. It is not an exact universal law for every galaxy or an independently replayed modern distance calibration. Later refinements retain separate credit.
Evidence
Source-linked, scoped account of the original work. The published scope states the scientific assumptions and remaining verification limits. WRS has not independently certified the full proof, experimental result or system benchmark.
Contributors
- R. Brent Tully · SCIENCE: Original source-listed scientific author of this scoped work; byline does not determine effort fractions.
- J. Richard Fisher · SCIENCE: Original source-listed scientific author of this scoped work; byline does not determine effort fractions.
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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