3mm GMVA observations of total and polarised emission from blazar and radio galaxy core regions.
- Dr. Carolina CASADIO
- Dr. Carolina CASADIO (MPIfR)
We present total and linearly polarised 3 mm GMVA images of a sample of blazars and radio galaxies from the VLBA-BU-BLAZAR 7 mm monitoring program aimed to probe the innermost regions of AGN jets and locate the sites of gamma-ray emission observed by Fermi-LAT. The reduced opacity at 3 mm and improved angular resolution, of the order of 50 $\mu$arcseconds, allow us to estimate the angular sizes and magnetic field structure of the most compact features, which can be compared with those observed at 7 mm with the VLBA for the determination of the jet's physical parameters. We also compare two different methods used for the calibration of instrumental polarisation and we present the results applied to some of the sources in the analysed sample.