Fig. 19. Phase space of the X-ray loudness versus optical luminosity of a sample of objects with limits on the X-ray luminosity as found for the current quasar sample. Shaded areas denote phase space regions devoid of sources (see Fig. 15).
![[FIGURE]](img185.gif)
![[FORMULA]](img1.gif)
versus optical luminosity of a sample of objects with limits on the X-ray luminosity as found for the current quasar sample. Shaded areas denote phase space regions devoid of sources (see Fig. 15).