The redshift z compares emitted and received local frequencies or wavelengths: 1+z=λrec/λem=νem/νrec. Motion, gravitation, and cosmological expansion can all contribute.
A shift of spectral features to shorter wavelengths and higher frequencies. Relative approach produces a kinematic blueshift through the Doppler effect; gravitational and cosmological contributions can also affect an observed shift.
Ancestors (4)
Incoming links (78)
- Angular sound-horizon degeneracy
- Chirp mass
- Comoving momentum
- Cosmological look-back time
- Cosmological redshift
- Cosmological spectral background
- Doppler factor
- Einstein-de Sitter cumulative number counts
- Equivalence principle does not uniquely fix field equations
- Equivalent width
- Formation redshift from halo mean density
- Horizon redshift of a Schwarzschild infaller
- Hubble constant
- Hubble's law
- Inferring a binary from a detector network
- K correction
- Low-redshift acceleration cosmography
- Luminosity-distance ordering of flat dust-vacuum universes
- Lyman-alpha forest
- Neutral-hydrogen column-density distribution
- Nonzero redshift-drift root in flat matter-Lambda cosmology
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- Redshift
- Spectroscopic test of the Twin Quasar lens
- Spectroscopic velocity drift
- Stipulated chirps and detector projections
- Supernova calibration and population tests
- Supernova discovery of accelerating expansion
- Surface-brightness conservation in gravitational lensing
- Type Ia supernova cosmology
- Vacuum conservation of specific intensity
- Worked supernova distance comparison
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