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gravitational redshift |
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gravitational redshift [‚grav·ə′tā·shən·əl ′red ‚shift] (relativity) A displacement of spectral lines toward the red when the gravitational potential at the observer of the light is greater than at its source. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In the case of MCG-6-30-15, the gravitational redshift is so extreme, says Fabian, that most of the emission must be coming from the gas and dust extremely close to the black hole. So if the observatory's spectrometers can accurately measure the gravitational redshift of X-rays emitted near a black hole, astronomers will be able to calculate the mass of the compact object that lurks there. He predicted two other effects, which were subsequently observed, namely the bending of starlight by the sun and the gravitational redshift corresponding to the amount of energy light loses as it fights the effects of gravity. |
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