  A revised sample of the 2 cm Very Long Baseline Array (VLBA) survey is
studied to test the isotropic distribution of radio sources on the sky and
their uniform distribution in space. The revised sample is complete to
flux-density limits of 1.5 Jy for positive declinations and 2 Jy for
declinations between 0 and -20 degrees. At present the active galactic nuclei
sample comprises 122 members. Application of the two-dimensional
Kolmogorov-Smirnov (K-S) test shows that there is no significant deviation from
the homogenous distribution in the sky, while the V/Vmax test shows that the
space distribution of active nuclei is not uniform at high confidence level
(99.9%). This is indicative of a strong luminosity and/or density evolution
implying that active nuclei (or jet activity phenomena) were more populous at
high redshifts, z~2.

Astrophysics