OQ208: a possible multi-wavelength polarimetric study with the SRT

We consider a possible contribution of the Sardinia Radio Telescope (SRT) to the polarimetric study of discrete sources. The foreseen capabilities are applied to the study of GHz-Peaked Spectrum (GPS) sources. The polarisation properties of these sources can be used to discriminate the absorption mechanism involved: Synchrotron Self Absorpion (SSA) would cause a change in the polarisation angle of 90◦ across the spectral peak, while Free-Free Absorption (FFA) would not. An accurate multi-wavelength polarimetric study could be carried out with the SRT and we apply the SRT specifications to a fake source with the radio spectrum identical to OQ208, and with a constant (unrealistic) fractional polarisation of 0.01. Considerations on the use of the SRT for a sky survey at 22 GHz are also given.