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

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.

[1]  C. Casadio,et al.  POLAMI: Polarimetric Monitoring of Active Galactic Nuclei at Millimetre Wavelengths - III. Characterization of total flux density and polarization variability of relativistic jets , 2017, 1709.08744.

[2]  C. Kramer,et al.  POLAMI: Polarimetric Monitoring of AGN at Millimetre Wavelengths - I. The programme, calibration and calibrator data products , 2017, 1709.08742.

[3]  A. Lähteenmäki,et al.  Kinematics of Parsec-scale Jets of Gamma-Ray Blazars at 43 GHz within the VLBA-BU-BLAZAR Program , 2017, 1711.03983.

[4]  B. Rani,et al.  Location of γ-ray emission and magnetic field strengths in OJ 287 , 2016, 1607.00725.

[5]  Uwe Bach,et al.  PROBING THE INNERMOST REGIONS OF AGN JETS AND THEIR MAGNETIC FIELDS WITH RADIOASTRON. I. IMAGING BL LACERTAE AT 21 μas RESOLUTION , 2015, 1512.04690.

[6]  J. Hodgson.  Ultra-high resolution observations of selected blazars , 2015 .

[7]  W. Alef,et al.  On the calibration of full-polarization 86 GHz global VLBI observations , 2012, 1203.1424.

[8]  Harvard,et al.  Efficient Generation of Jets from Magnetically Arrested Accretion on a Rapidly Spinning Black Hole , 2011, 1108.0412.

[9]  Paul S. Smith,et al.  FLARING BEHAVIOR OF THE QUASAR 3C 454.3 ACROSS THE ELECTROMAGNETIC SPECTRUM , 2010, 1003.4293.

[10]  Paul S. Smith,et al.  Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Jet Kinematics from Bimonthly Monitoring with the Very Long Baseline Array , 2005, astro-ph/0502501.

[11]  A. Marscher,et al.  High-Frequency VLBA Total and Polarized Intensity Images of Gamma-Ray Bright Blazars , 2002 .

[12]  J. Zensus,et al.  Linear Polarization Imaging with Very Long Baseline Interferometry at High Frequencies , 1995 .