Evidence for the class of the most luminous quasars II . Variability , polarization , and the gap in the MV distribution

We use250 radio loud quasars with UBV photometry available andz < 1.65, to study whether there is a gap in the distribution of absolute magnitudes, from MV ≈ −25.8 (for Ho = 100 kms−1 Mpc−1, qo = 0.5) to −25.3, as was suggested by Teerikorpi (1981b; Paper I). In Paper I it was also proposed that there is a class of the most luminous radio quasars, differing… (More)