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- Tolman_surface_brightness_test abstract "The Tolman surface brightness test is one out of a half-dozen cosmological tests that was conceived in the 1930s to check the viability of and compare new cosmological models. Tolman's test compares the surface brightness of galaxies as a function of their redshift (measured as z). Such a comparison was first proposed in 1930 by Richard C. Tolman as a test of whether the universe is expanding or static. Different physicists have claimed that the results support different models.In a simple (static and flat) universe, the light received from an object drops inversely with the square of its distance, but the apparent area of the object also drops inversely with the square of the distance, so the surface brightness would be independent of the distance. In an expanding universe, however, there are two effects that reduce the power detected coming from distant objects. First, the rate at which photons are received is reduced because each photon has to travel a little farther than the one before. Second, the energy of each photon observed is reduced by the redshift. At the same time, distant objects appear larger than they really are because the photons observed were emitted at a time when the object was closer. Adding these effects together, the surface brightness in a simple expanding universe (flat geometry and uniform expansion over the range of redshifts observed) should decrease with the fourth power of (1+z).To date, the best investigation of the relationship between surface brightness and redshift was carried out using the 10m Keck telescope to measure nearly a thousand galaxies' redshifts and the 2.4m Hubble Space Telescope to measure those galaxies' surface brightness. The exponent found is not 4 as expected in the simplest expanding model, but 2.6 or 3.4, depending on the frequency band. The authors summarize:We show that this is precisely the range expected from the evolutionary models of Bruzual & Charlot. We conclude that the Tolman surface brightness test is consistent with the reality of the expansion.↑".
- Tolman_surface_brightness_test wikiPageID "3096030".
- Tolman_surface_brightness_test wikiPageLength "3153".
- Tolman_surface_brightness_test wikiPageOutDegree "14".
- Tolman_surface_brightness_test wikiPageRevisionID "667050948".
- Tolman_surface_brightness_test wikiPageWikiLink Category:Physical_cosmology.
- Tolman_surface_brightness_test wikiPageWikiLink Cosmological_test.
- Tolman_surface_brightness_test wikiPageWikiLink Galaxy.
- Tolman_surface_brightness_test wikiPageWikiLink Hubble_Space_Telescope.
- Tolman_surface_brightness_test wikiPageWikiLink Metric_expansion_of_space.
- Tolman_surface_brightness_test wikiPageWikiLink Physical_cosmology.
- Tolman_surface_brightness_test wikiPageWikiLink Redshift.
- Tolman_surface_brightness_test wikiPageWikiLink Richard_C._Tolman.
- Tolman_surface_brightness_test wikiPageWikiLink Source_counts.
- Tolman_surface_brightness_test wikiPageWikiLink Static_universe.
- Tolman_surface_brightness_test wikiPageWikiLink Surface_brightness.
- Tolman_surface_brightness_test wikiPageWikiLink Time_dilation.
- Tolman_surface_brightness_test wikiPageWikiLink Tired_light.
- Tolman_surface_brightness_test wikiPageWikiLink W._M._Keck_Observatory.
- Tolman_surface_brightness_test wikiPageWikiLinkText "Tolman surface brightness test".
- Tolman_surface_brightness_test wikiPageWikiLinkText "surface brightness of galaxies evolving with time".
- Tolman_surface_brightness_test wikiPageUsesTemplate Template:Reflist.
- Tolman_surface_brightness_test wikiPageUsesTemplate Template:Who.
- Tolman_surface_brightness_test subject Category:Physical_cosmology.
- Tolman_surface_brightness_test type Physic.
- Tolman_surface_brightness_test type Sub-discipline.
- Tolman_surface_brightness_test comment "The Tolman surface brightness test is one out of a half-dozen cosmological tests that was conceived in the 1930s to check the viability of and compare new cosmological models. Tolman's test compares the surface brightness of galaxies as a function of their redshift (measured as z). Such a comparison was first proposed in 1930 by Richard C. Tolman as a test of whether the universe is expanding or static.".
- Tolman_surface_brightness_test label "Tolman surface brightness test".
- Tolman_surface_brightness_test sameAs Q7814443.
- Tolman_surface_brightness_test sameAs m.08r45p.
- Tolman_surface_brightness_test sameAs Tolman_Surface_Brightness_Test.
- Tolman_surface_brightness_test sameAs Q7814443.
- Tolman_surface_brightness_test wasDerivedFrom Tolman_surface_brightness_test?oldid=667050948.
- Tolman_surface_brightness_test isPrimaryTopicOf Tolman_surface_brightness_test.