VLBA Polarimetry of GPS Quasar OQ172

We present a study of the VLBA polarimetry of GHz-Peaked Spectrum (GPS) quasar OQ172. GPS quasar OQ172 is one of the source with the extremely highest rest-frame rotation measure (RM > 20,000 rad/m²). By analyzed our of VLBA polarimetry observation, we found the Rotation Measure on C & X band would be well fitted by linear relationship of the square of λ². Combined other evidences of physical environment in the core of OQ172, we suggest that this source might be a young AGN.