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- Surface_brightness_fluctuation abstract "Surface brightness fluctuation (SBF) is a secondary distance indicator used to estimate distances to galaxies. It is useful to 100 MPc (parsec). The method measures the variance in a galaxy's light distribution arising from fluctuations in the numbers of and luminosities of individual stars per resolution element. The technique uses the fact that galaxies are made up of a finite number of stars. The number of stars in any small patch of a galaxy will vary from point to point, creating a noise-like fluctuation in its surface brightness. While the various stars present in a galaxy will cover an enormous range of luminosity, the SBF can be characterized as having an average brightness. A galaxy twice as far away appears twice as smooth as a result of the averaging. Older elliptical galaxies have fairly consistent stellar populations, thus it closely approximates a standard candle. In practice, corrections are required to account for variations in age or metallicity from galaxy to galaxy. Calibration of the method is made empirically from Cepheids or theoretically from stellar population models.The SBF pattern is measured from the power spectrum of the residuals left behind from a deep galaxy image after a smooth model of the galaxy has been subtracted. The SBF pattern is evident as the transform of the point spread function in the Fourier domain. The amplitude of the spectrum gives the luminosity of the fluctuation star. Because the technique depends on a precise understanding of the image structure of the galaxy, extraneous sources such as globular clusters and background galaxies must be excluded. Corrections for interstellar dust absorption must also be accounted. In practice this means that SBF works best for elliptical galaxies or the bulges of S0 galaxies, and less so for spiral galaxies as they generally have complex morphologies and extensive dust features.SBF is calibrated by use of nearby Cepheid Period-Luminosity relation (P-L) based on observations of variables located in the Large Magellanic Cloud. (Tonry 2001)(Macri 2006)SBF is an indicator that uses stars in the old stellar populations (Population II).".
- Surface_brightness_fluctuation wikiPageID "8599808".
- Surface_brightness_fluctuation wikiPageLength "4452".
- Surface_brightness_fluctuation wikiPageOutDegree "15".
- Surface_brightness_fluctuation wikiPageRevisionID "676133567".
- Surface_brightness_fluctuation wikiPageWikiLink Category:Standard_candles.
- Surface_brightness_fluctuation wikiPageWikiLink Cepheid_variable.
- Surface_brightness_fluctuation wikiPageWikiLink Cosmic_distance_ladder.
- Surface_brightness_fluctuation wikiPageWikiLink Cosmic_dust.
- Surface_brightness_fluctuation wikiPageWikiLink Elliptical_galaxy.
- Surface_brightness_fluctuation wikiPageWikiLink Frequency_domain.
- Surface_brightness_fluctuation wikiPageWikiLink Globular_cluster.
- Surface_brightness_fluctuation wikiPageWikiLink Large_Magellanic_Cloud.
- Surface_brightness_fluctuation wikiPageWikiLink Lenticular_galaxy.
- Surface_brightness_fluctuation wikiPageWikiLink Parsec.
- Surface_brightness_fluctuation wikiPageWikiLink Point_spread_function.
- Surface_brightness_fluctuation wikiPageWikiLink Spectral_density.
- Surface_brightness_fluctuation wikiPageWikiLink Stellar_population.
- Surface_brightness_fluctuation wikiPageWikiLinkText "Surface brightness fluctuation".
- Surface_brightness_fluctuation wikiPageWikiLinkText "surface brightness fluctuation".
- Surface_brightness_fluctuation wikiPageUsesTemplate Template:Astronomy-stub.
- Surface_brightness_fluctuation wikiPageUsesTemplate Template:Citation.
- Surface_brightness_fluctuation wikiPageUsesTemplate Template:Harv.
- Surface_brightness_fluctuation wikiPageUsesTemplate Template:Refbegin.
- Surface_brightness_fluctuation wikiPageUsesTemplate Template:Refend.
- Surface_brightness_fluctuation wikiPageUsesTemplate Template:Reflist.
- Surface_brightness_fluctuation subject Category:Standard_candles.
- Surface_brightness_fluctuation hypernym Indicator.
- Surface_brightness_fluctuation type ChemicalCompound.
- Surface_brightness_fluctuation type Astrophysic.
- Surface_brightness_fluctuation comment "Surface brightness fluctuation (SBF) is a secondary distance indicator used to estimate distances to galaxies. It is useful to 100 MPc (parsec). The method measures the variance in a galaxy's light distribution arising from fluctuations in the numbers of and luminosities of individual stars per resolution element. The technique uses the fact that galaxies are made up of a finite number of stars.".
- Surface_brightness_fluctuation label "Surface brightness fluctuation".
- Surface_brightness_fluctuation sameAs Q1999487.
- Surface_brightness_fluctuation sameAs Surface_Brightness_Fluctuation.
- Surface_brightness_fluctuation sameAs Fluctuation_de_la_brillance_de_surface.
- Surface_brightness_fluctuation sameAs Fluttuazione_della_luminosità_superficiale.
- Surface_brightness_fluctuation sameAs 표면밝기_요동.
- Surface_brightness_fluctuation sameAs Surface_brightness_fluctuation.
- Surface_brightness_fluctuation sameAs m.0279g89.
- Surface_brightness_fluctuation sameAs Q1999487.
- Surface_brightness_fluctuation sameAs 表面亮度起伏.
- Surface_brightness_fluctuation wasDerivedFrom Surface_brightness_fluctuation?oldid=676133567.
- Surface_brightness_fluctuation isPrimaryTopicOf Surface_brightness_fluctuation.