We investigate the sample of 213 GPS sources selected from simultaneous multi-frequency 1–22 GHz observations obtained with RATAN–600 radio telescope .
We use publicly available data to characterize parsec-scale structure of the selected sources .
Among them we found 121 core dominated sources , 76 Compact Symmetric Object ( CSO ) candidates ( 24 of them are highly probable ) , 16 sources have complex parsec-scale morphology .
Most of GPS galaxies are characterized by CSO-type morphology and lower observed peak frequency ( \sim 1.8 GHz ) .
Most of GPS quasars are characterized by “ core-jet ” -type morphology and higher observed peak frequency ( \sim 3.6 GHz ) .
This is in good agreement with previous results .
However , we found a number of sources for which the general relation CSO – galaxy , core-jet – quasar does not hold .
These sources deserve detailed investigation .
Assuming simple synchrotron model of a homogeneous cloud we estimate characteristic magnetic field in parsec-scale components of GPS sources to be B \sim 10 mG .