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We present the mass functions of actively accreting supermassive black holesover the redshift range 0.3 <= z <= 5 for a well-defined, homogeneous sample of15,180 quasars from the Sloan Digital Sky Survey Data Release 3 (SDSS DR3)within an effective area of 1644 square degrees. This sample is the mostuniform statistically significant subset available for the DR3 quasar sample.It was used for the DR3 quasar luminosity function, presented by Richards etal., and is the only sample suitable for the determination of the SDSS quasarblack hole mass function. The sample extends from i = 15 to i = 19.1 at z lessthan about 3 and to i = 20.2 for z greater than about 3. The mass functionsdisplay a rise and fall in the space density distribution of active black holesat all epochs. Within the uncertainties the high-mass decline is consistentwith a constant slope of beta of about -3.3 at all epochs. This slope issimilar to the bright end slope of the luminosity function for epochs below z =4. Our tests suggest that the down-turn toward lower mass values is due toincompleteness of the quasar sample with respect to black hole mass. Furtherdetails and analysis of these mass functions will be presented in forthcomingpapers.

Mass Functions of the Active Black Holes in Distant Quasars from the Sloan Digital Sky Survey Data Release 3