EUV ENERGY-DISTRIBUTIONS OF ACCRETION DISKS IN ACTIVE GALACTIC NUCLEI

We have calculated UV/EUV (300 angstrom less-than-or-equal-to lambda l ess-than-or-equal-to 1500 angstrom) continuous energy distributions of accretion disks in the centers of active galactic nuclei (AGNs) for d isk luminosities in the range 0.1 . L(Edd) less-than-or-equal-to L(acc ) < 1.0.L(Edd) and central masses ranging from 10(8) M. to 10(10) M.. The vertical gas pressure structure of the disk is obtained analytical ly, the temperature stratification and the resulting continuum radiati on fields are calculated numerically. We show that weak Lyman edges ar e an intrinsic feature of such disks. The strength of the H I Lyman ed ge decreases for increasing accretion rate and fixed mass of the centr al black hole. It increases for increasing central mass and fixed lumi nosity in terms of the Eddington luminosity.