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gravitational redshift

(redshift due to GR effects of gravity)

A gravitational redshift is a redshift due to the source being near a massive object (rather than due to a relative radial velocity between observer and the source). Instead of slowing down, as would a massive object following that path, electromagnetic radiation redshifts. Higher mass and density increase the effect and black holes, neutron stars, and galaxy clusters can produce a significant redshift. Stars can produce a significant redshift in their own spectral lines.

A measured redshift can be useful observation data, e.g., to help determine the mass of an object, or to detect and analyze the implications of the Sachs-Wolfe effect.


(measure,EMR,Doppler)
http://en.wikipedia.org/wiki/Gravitational_redshift

Referenced by:
Sachs-Wolfe effect (SWE)

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