Accretion disk spectra of super-luminal jet sources and ultra-luminous compact X-ray sources in nearby spiral galaxies

The Ultra-luminous Compact X-ray Sources (ULXs) in nearby spiral galaxies a nd the Galactic super-luminal jet sources share the common spectral charact eristic that they have extremely high disk temperatures which cannot be exp lained in the framework of the standard accretion disk model in the Schwarz schild metric. We have calculated an extreme Kerr disk model to examine if the Kerr disk model can instead explain the observed 'too hot' accretion di sk spectra. We found that the Kerr disk spectrum becomes significantly hard er compared to the Schwarzschild disk only when the disk is highly inclined . For super-luminal jet sources, which are known to be inclined systems, th e Kerr disk model may thus work if we choose proper values for the black ho le angular momentum. For the ULXs, however, the Kerr disk interpretation wi ll be problematic, as is is highly unlikely that their accretion disks are preferentially inclined.