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- Redshift-space_distortions abstract "Redshift-space distortions are an effect in observational cosmology where the spatial distribution of galaxies appears squashed and distorted when their positions are plotted in redshift-space (i.e. as a function of their redshift) rather than in real-space (as a function of their actual distance). The effect is due to the peculiar velocities of the galaxies causing a Doppler shift in addition to the redshift caused by the cosmological expansion.Redshift-space distortions (RSDs) manifest in two particular ways. The Fingers of God effect is where the galaxy distribution is elongated in redshift space, with an axis of elongation pointed toward the observer. It is caused by a Doppler shift associated with the random peculiar velocities of galaxies bound in structures such as clusters. The large velocities that lead to this effect are associated with the gravity of the cluster by means of the virial theorem; they change the observed redshifts of the galaxies in the cluster. The deviation from the Hubble's law relationship between distance and redshift is altered, and this leads to inaccurate distance measurements.Another, closely related effect is the Kaiser effect. This time, the distortion is caused by the coherent motions of galaxies as they fall inwards towards the cluster center as the cluster assembles. Depending on the particular dynamics of the situation, the Kaiser effect usually leads not to an elongation, but an apparent flattening ("pancakes of God"), of the structure. It is a much smaller effect than the fingers of God, and can be distinguished by the fact that it occurs on larger scales.The RSDs measured in galaxy redshift surveys can be used as a cosmological probe in their own right, providing information on how structure formed in the Universe, and how gravity behaves on large scales.".
- Redshift-space_distortions wikiPageExternalLink catalogue.asp?isbn=9780521157155&ss=res.
- Redshift-space_distortions wikiPageExternalLink Red_Shift_Distortions.
- Redshift-space_distortions wikiPageExternalLink Coil4.html.
- Redshift-space_distortions wikiPageID "990090".
- Redshift-space_distortions wikiPageLength "4057".
- Redshift-space_distortions wikiPageOutDegree "12".
- Redshift-space_distortions wikiPageRevisionID "669396963".
- Redshift-space_distortions wikiPageWikiLink Category:Analogy.
- Redshift-space_distortions wikiPageWikiLink Category:Observational_cosmology.
- Redshift-space_distortions wikiPageWikiLink Category:Physical_cosmology.
- Redshift-space_distortions wikiPageWikiLink Doppler_effect.
- Redshift-space_distortions wikiPageWikiLink Doppler_shift.
- Redshift-space_distortions wikiPageWikiLink Expansion_of_space.
- Redshift-space_distortions wikiPageWikiLink Gravity.
- Redshift-space_distortions wikiPageWikiLink Hubbles_law.
- Redshift-space_distortions wikiPageWikiLink Metric_expansion_of_space.
- Redshift-space_distortions wikiPageWikiLink Observational_cosmology.
- Redshift-space_distortions wikiPageWikiLink Peculiar_velocity.
- Redshift-space_distortions wikiPageWikiLink Redshift.
- Redshift-space_distortions wikiPageWikiLink Redshift_survey.
- Redshift-space_distortions wikiPageWikiLink Virial_theorem.
- Redshift-space_distortions wikiPageWikiLinkText "Redshift-space distortions".
- Redshift-space_distortions hasPhotoCollection Redshift-space_distortions.
- Redshift-space_distortions wikiPageUsesTemplate Template:Astronomy-stub.
- Redshift-space_distortions wikiPageUsesTemplate Template:Cite_book.
- Redshift-space_distortions wikiPageUsesTemplate Template:Cosmology.
- Redshift-space_distortions wikiPageUsesTemplate Template:Cosmology-stub.
- Redshift-space_distortions wikiPageUsesTemplate Template:Physics-stub.
- Redshift-space_distortions wikiPageUsesTemplate Template:Refbegin.
- Redshift-space_distortions wikiPageUsesTemplate Template:Refend.
- Redshift-space_distortions wikiPageUsesTemplate Template:Reflist.
- Redshift-space_distortions subject Category:Analogy.
- Redshift-space_distortions subject Category:Observational_cosmology.
- Redshift-space_distortions subject Category:Physical_cosmology.
- Redshift-space_distortions hypernym Effect.
- Redshift-space_distortions type Disease.
- Redshift-space_distortions comment "Redshift-space distortions are an effect in observational cosmology where the spatial distribution of galaxies appears squashed and distorted when their positions are plotted in redshift-space (i.e. as a function of their redshift) rather than in real-space (as a function of their actual distance).".
- Redshift-space_distortions label "Redshift-space distortions".
- Redshift-space_distortions sameAs Dits_de_Déu.
- Redshift-space_distortions sameAs Rotverschiebungsraum.
- Redshift-space_distortions sameAs m.03x54d.
- Redshift-space_distortions sameAs Q2169119.
- Redshift-space_distortions sameAs Q2169119.
- Redshift-space_distortions sameAs 上帝的手指.
- Redshift-space_distortions wasDerivedFrom Redshift-space_distortions?oldid=669396963.
- Redshift-space_distortions isPrimaryTopicOf Redshift-space_distortions.