Cosmological Redshift
Laboratory experiments here on Earth have determined that each element in the periodic table emits photons only at certain wavelengths (determined by the excitation state of the atoms).
Cosmological Redshift
The cosmological redshift is a redshift caused by the expansion of space.
COSMOLOGICAL REDSHIFT
Cosmological redshifts become dominant for objects outside our Local Group of galaxies. These redshifts are a result of the stretching of space time, as postulated by general relativity, and not by radial motion.
Cosmological Redshift and Hubble's Law
We find that most galaxies show cosmological redshift, which means the detected radiation from the galaxies is shifted to longer wavelengths.
Cosmological Redshift
The light from distant galaxies is shifted to lower frequencies.
cosmological redshift The component of the redshift of an object which is due only to the Hubble flow of the universe.
cosmology The study of the structure and evolution of the entire universe.
cosmological redshift
An effect where light emitted from a distant source appears redshifted because of the expansion of spacetime itself. Compare Doppler effect.
COSMOLOGICAL REDSHIFT - Redshift caused by the expansion of space. The wavelength of light increases as it traverses the expanding universe between its point of emission and its point of detection by the same amount that space has expanded during ...
Cosmological Redshift
(a) The redshift produced by the expansion of the Universe and the reason most galaxies in the Universe have redshifts. Contrary to popular belief, this is not a Doppler shift.
cosmological redshift - (n.)
A Doppler shift toward longer wavelengths that is caused by a galaxy's motion of recession, which in turn is caused by the expansion of the universe.
cosmology - (n.) ...
Edwin Powell Hubble (November 20, 1889 â€" September 28, 1953) was an American astronomer, noted for his discovery of galaxies beyond the Milky Way and the cosmological redshift.
Why does the expansion of the universe translate into a cosmological redshift? Consider a distant quasar. Recall that because of the lookback time effect we are seeing the quasar as it was many billions of years ago when the universe was younger.
If one has a secure Doppler plus cosmological redshift for the whole system (from surrounding stars or gas at large distances), one could search for excess redshift from material close to the central object.
A further argument in favor of cosmological redshifts for quasars is the essentially perfect rank ordering implied by the fact that quasar absorption line system always have redshifts less than or equal to the quasar emission line redshift.
The Doppler shift is not responsible for the redshifts that most galaxies exhibit; that is a cosmological redshift. [C95]
(b) Change in the apparent wavelength of radiation (e.g., light or sound) emitted by a moving body.
proper derivation of the cosmological redshift
Falling into a Black Hole
redshift resolves Olbers' paradox ...
Each pair is the result of a galaxy merger with look-back times of four to seven billion years (cosmological redshifts of 0.3-0.8). Beyond this range the emission lines were redshifted out of the wavelength range the survey could detect.
of electromagnetic radiation resulting from one or more of three causes: Doppler redshift: resulting from bodies moving away from each other in space. Gravitational redshift: resulting from strong gravitational fields. Cosmological redshift: ...
energy density of the gravitational waves produced, however, is unlikely to exceed the energy density of electromagnetic radiation, and each graviton (the gravitational analogue of the photon) would be susceptible to the same cosmological redshift by ...
 See also: Redshift, Light, Galaxies, Field, Universe
  
|
RSS
