Given a luminosity as input, the luminosity function essentially returns the abundance of objects with that luminosity ( specifically, number density per luminosity interval ).
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The number of candelas or lumens from a source also depends on its spectrum, via the nominal response of the human eye as represented in the luminosity function.
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The radiometric unit watts per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception.
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The "'luminosity function "'or "'luminous efficiency function "'describes the average spectral sensitivity of human visual perception of brightness.
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This is a particular issue with the faint objects in calculating a luminosity function, as their smaller maximum volume means that a large-scale structure therein will have a large impact.
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For instance, when trying to obtain a luminosity function, calibrate the Tully Fisher relation, or obtain the value of the Hubble constant, the Malmquist bias can strongly change the results.
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They are based on an agreed-upon standard luminosity function which is based on measurements of the spectral characteristics of image-forming " visual photoreception " in many individual human eyes.
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Like the photometric definition, it is related to the luminous flux density in a particular direction, which is radiant flux density weighted by the luminosity function ( " ? " ) of the CIE Standard Observer.
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The results will also test current theories of gravity by mapping the growth of structure with redshift . Thirdly, detailed analysis of star-formation rates, environments, morphologies and luminosity functions will provide information on galaxy evolution.
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The sensitivity of cones to both of the spectral colors at the opposite extremes of what the human eye can see is quite low ( see luminosity function ), so commonly observed purple colors do not achieve a high level of brightness.
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