AGN FROM THE ROSAT ALL-SKY SURVEY

This paper presents long slit CCD spectroscopy and X-ray data of 283 A GN detected in the ROSAT-All Sky Survey (RASS). Basis of the sample is the pre-identification of 4651 RASS sources on 134 sky fields (coveri ng in total similar to 3500 square). The 283 presented AGN were select ed from 1253 AGN candidates resulting from the pre-identification work . The optically brighter counterparts to the ROSAT X-ray sources are f avoured. According to the absolute magnitude the sample consists of 15 8 QSOs and 111 Seyfert 1 galaxies. The remaining 14 objects do not sho w broad emission lines characterizing Seyfert 1 galaxies. They have to be classified as Seyfert 2 and various types of starburst galaxies. F or 143 objects it is possible to derive spectral slopes in the ROSAT X -ray energy range (0.1 - 2.4 keV) from the standard output of the RASS yielding a mean energy index [alpha(E)] = 1.43 (f(E) proportional to E(-alpha E)). For the most common optical emission lines the equivalen t width and FWHM were measured.