3 mm GMVA Observations of Total and Polarized Emission from Blazar and Radio Galaxy Core Regions

• Main Authors: Carolina Casadio, Thomas P. Krichbaum, Alan P. Marscher, Svetlana G. Jorstad, José L. Gómez, Iván Agudo, Uwe Bach, Jae-Young Kim, Jeffrey A. Hodgson, Anton J. Zensus
• Format: Article
• Language: English
• Published: MDPI AG 2017-10-01
• Series: Galaxies
• Subjects: galaxies: active; galaxies: jets; techniques: high angular resolution
• Online Access: https://www.mdpi.com/2075-4434/5/4/67
• ISSN: 2075-4434

We present total and linearly polarized 3 mm Global mm-VLBI Array (GMVA; mm-VLBI: Very Long Baseline Interferometry observations at millimetre wavelengths) images of a sample of blazars and radio galaxies from the VLBA-BU-BLAZAR 7 mm monitoring program designed to probe the innermost regions of active galactic nuclei (AGN) jets and locate the sites of gamma-ray emission observed by the Fermi-LAT. The lower opacity at 3 mm and improved angular resolution—on the order of 50 microarcseconds—allow us to distinguish features in the jet not visible in the 7 mm VLBA data. We also compare two different methods used for the calibration of instrumental polarisation and we analyze the resulting images for some of the sources in the sample.