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发光度函数[Luminosity Function]
[2005-4-17]
iamet
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The number of galaxies in the luminosity range
in a given volume is denoted
. The observational approximation to the mean number of galaxies per unit volume brighter than absolute magnitude
M
measured by Hubble is
The function must be continuous, so
For the Coma Cluster,
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in a given volume is denoted 
. The observational approximation to the mean number of galaxies per unit volume brighter than absolute magnitude M measured by Hubble is 
