The ROSAT wide field camera extragalactic survey

We report the results of a new analysis of the ROSAT Wide Field Camera (WFC ) all-sky survey data, designed to detect extragalactic sources of extreme ultraviolet (EW) radiation in regions of low Galactic N-H. We identify a to tal of 19 active galactic nuclei (AGN), more than double the number of conf irmed AGN in the published WFC (2RE) survey. Our sample contains eight narr ow-line Seyfert 1 galaxies, making this the first reasonably sized, complet e sample of these extreme AGN, along with six broad-line Seyfert 1s and fiv e BL Lacertae objects. These EUV-selected sources typically have steep soft X-ray spectra with a mean power-law energy index alpha(X) approximate to - 2. The derived AGN luminosity function is rather flat and appears to cut of f above a luminosity of 10(46) erg s(-1) kev(-1), measured monochromaticall y at 200 eV. Narrow-line Seyfert Is account for roughly half of the local ( z approximate to 0) volume emissivity in the EW band.