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velocity-distance relation

См. также в других словарях:

  • Relation de Faber-Jackson — La relation de Faber Jackson est une loi empirique qui relie la magnitude absolue ou la luminosité L à la dispersion des vitesses σ des étoiles centrales des galaxies elliptiques. Elle permet la détermination des distances pour ce type de galaxie …   Wikipédia en Français

  • Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… …   Wikipedia

  • Tully-Fisher relation — In astronomy, the Tully Fisher relation, published by astronomers R. Brent Tully and J. Richard Fisher in 1977, is an empirical relationship between the intrinsic luminosity (proportional to the stellar mass) of a spiral galaxy and its velocity… …   Wikipedia

  • Extragalactic distance scale — The extragalactic distance scale is a series of techniques used today by astronomers to determine the distance of cosmological bodies (beyond our own galaxy) not easily obtained with traditional methods. Some procedures utilize properties of… …   Wikipedia

  • Faber-Jackson relation — The Faber Jackson relation is an early empirical power law relation between the luminosity L and the central stellar velocity dispersion sigma of elliptical galaxies, first noted by the astronomers Sandra M. Faber and Robert Earl Jackson in 1976 …   Wikipedia

  • Proper velocity — η.In flat spacetime, proper velocity is the ratio between distance traveled relative to a reference map frame (used to define simultaneity) and proper time τ elapsed on the clocks of the traveling object. It equals the object s momentum p divided …   Wikipedia

  • Mass–luminosity relation — In astrophysics, the mass–luminosity relation is an equation giving the relationship between a star s mass and its luminosity. The relationship is represented by the equation: where L⊙ and M⊙ are the luminosity and mass of the sun and… …   Wikipedia

  • galaxy — /gal euhk see/, n., pl. galaxies. 1. Astron. a. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. b. (usually cap.) See Milky Way. 2. any large and brilliant or impressive… …   Universalium

  • physical science — physical scientist. 1. any of the natural sciences dealing with inanimate matter or with energy, as physics, chemistry, and astronomy. 2. these sciences collectively. [1835 45] * * * Introduction       the systematic study of the inorganic world …   Universalium

  • List of the most distant astronomical objects — This article documents the farthest known astronomical objects, and the time periods in which they were so classified. Contents 1 List of most distant objects by type 2 Most distant astronomical object recordholders 3 List of most distant objects …   Wikipedia

  • Metric expansion of space — Physical cosmology Universe · Big Bang …   Wikipedia


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