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Unformatted text preview: such as having the wrong limiting flux can only make the mean value of V/V m less than 0.5, so that higher values may be taken as either a strong geometrical effect or evidence for some kind of evolution in the luminosity function. If we were sure of our world model, we could use a luminositydistance formulation instead of simple r in calculating V/V m . As set out by Schmidt 1968, we then use as a distance measure not just cz/H but multiply this by This and related techniques show a strong increase in the number of luminous QSOs with increasing redshift up to about z =2.5, with the comoving density varying approximately as (1+z) 5 ....
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This note was uploaded on 11/10/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.
 Fall '10
 EmilyHoward
 Astronomy

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