Optical identification of joint EUVE and ROSAT detections in the southern hemisphere: Soft active galactic nuclei

We report the optical identification of six sources detected in the same directions during the all-sky surveys conducted by the Extreme Ultraviolet Explorer (EUVE) satellite in the 58-174 Angstrom (0.071-0.214 keV) extreme ultraviolet (EUV) band and the ROSAT Position Sensitive Proportional Counter (PSPC) in the 0.1-2.4 keV X-ray band. All the sources correspond to newly discovered active galactic nuclei (one quasi-stellar object, four Seyfert I galaxies, and one Seyfert Il galaxy) in the redshift range z = 0.071-0.382 and are the most likely counterparts of the ROSAT PSPC X-ray sources. In two cases the sources are also the most probable optical counterparts of the EUV detections while in the remaining cases further observations are needed to confirm the EUV identification. We discuss the EUV to soft X-ray properties of these ''soft'' active galactic nuclei. (C) 1997 American Astronomical Society.