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We present a determination of the average space density and birth rate ofhydrogen-line (DA) white dwarfs within a radius of 1 kpc around the Sun, basedon an observational sample of 360 candidate white dwarfs with g<19.5 and(g-r)<0.4, selected from the UV-excess Survey of the Northern Galactic Plane(UVEX), in combination with a theoretical white dwarf population that has beenconstructed to simulate the observations, including the effects of reddeningand observational selection effects. The main uncertainty in the derivation ofthe white dwarf space density and current birth rate lies in the absolutephotometric calibration and the photometric scatter of the observational data,which influences the classification method on colours, the completeness and thepollution. Corrections for these effects are applied. We derive an averagespace density of hydrogen-line (DA) white dwarfs with T_eff > 10,000K(M_V<12.2) of (3.8 +/- 1.1) x 1e-4 pc^-3, and an average DA white dwarf birthrate over the last 7e7 years of (5.4 + 1.5) x 1e-13 pc^-3 yr^-1. Additionally,we show that many estimates of the white dwarf space density from differentstudies are consistent with each other, and with our determination here.

A determination of the space density and birth rate of hydrogen-line (DA) white dwarfs in the Galactic Plane, based on the UVEX survey