On the Calibration of Full-polarization 86GHz Global VLBI Observations

Abstract

We report the development of a semi-automatic pipeline for the calibration of 86 GHz full-polarization observations performed with the Global Millimeter-VLBI array (GMVA) and describe the calibration strategy followed in the data reduction. Our calibration pipeline involves non-standard procedures, since VLBI polarimetry at frequencies above 43 GHz is not yet well established. We also present, for the first time, a full-polarization global-VLBI image at 86 GHz (source 3C 345), as an example of the final product of our calibration pipeline, and discuss the effect of instrumental limitations on the fidelity of the polarization images. Our calibration strategy is not exclusive for the GMVA, and could be applied on other VLBI arrays at millimeter wavelengths. The use of this pipeline will allow GMVA observers to get fully-calibrated datasets shortly after the data correlation.

arXiv comment10 pages, 10 figures. Accepted for publication in A&A

References in corpus (9)

• Efficient Generation of Jets from Magnetically Arrested Accretion on a Rapidly Spinning Black Hole
• General Relativistic Magnetohydrodynamic Simulations of Magnetically Choked Accretion Flows around Black Holes
• Imaging the Black Hole Silhouette of M87: Implications for Jet Formation and Black Hole Spin
• Full Polarization Spectra of 3C 279
• On the source of Faraday rotation in the jet of the radio galaxy 3C120
• Spurious source generation in mapping from noisy phase-self-calibrated data
• Multi-frequency polarization properties of ten quasars on deca-parsec scales at z > 3
• 86 GHz Very Long Baseline Polarimetry of 3C273 and 3C279 with the Coordinated Millimeter VLBI Array
• On the solution of the polarisation gain terms for VLBI data collected with antennas having Nasmyth or E-W mounts

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