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{{Unreferenced stub|auto=yes|date=December 2009}} | |||
'''Recessional velocity''' is the rate at which an object is moving away, typically from [[Earth]]. | |||
==Application to cosmology== | |||
Recessional velocity is most pertinent to distant [[Galaxy|galaxies]], which (due to [[Hubble law|Hubble's Law]]) [[redshift]] proportionally to their distance from the Earth. The redshift is usually interpreted as due to recessional velocity, which can be calculated according to the formula: | |||
:<math>v = H_0 D\ </math> | |||
where <math>H_0</math> is the [[Hubble constant]], <math>D</math> is the intervening distance, and <math>v</math> is the recessional velocity, generally measured in km/s. | |||
The recessional velocity of a galaxy is usually calculated from the [[redshift]] observed in its emitted [[electromagnetic radiation]]. The distance to the [[galaxy]] is then estimated using [[Hubble's Law]]. | |||
==References== | |||
{{reflist}} | |||
{{DEFAULTSORT:Recessional Velocity}} | |||
[[Category:Observational astronomy]] | |||
{{Astronomy-stub}} | |||
Revision as of 00:43, 15 March 2013
Template:Unreferenced stub Recessional velocity is the rate at which an object is moving away, typically from Earth.
Application to cosmology
Recessional velocity is most pertinent to distant galaxies, which (due to Hubble's Law) redshift proportionally to their distance from the Earth. The redshift is usually interpreted as due to recessional velocity, which can be calculated according to the formula:
where is the Hubble constant, is the intervening distance, and is the recessional velocity, generally measured in km/s.
The recessional velocity of a galaxy is usually calculated from the redshift observed in its emitted electromagnetic radiation. The distance to the galaxy is then estimated using Hubble's Law.
References
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