GMVA17B-324

Magnetic field in the vicinity of central black holes in 3C273 and 3C279

Abstract

Multifrequency VLBI polarimetry is the best tool to probe the strength and structure of the magnetic field in the inner jets and in the extreme vicinity of supermassive black holes. We propose here to use the GMVA+ALMA observations of 3C273 and 3C279 in combination with our planned RadioAstron observations at 22 GHz in order to obtain the most detailed picture of polarized emission distribution and Faraday rotation measure in these objects on scales down to ~20-30 microarcseconds. The phased ALMA will be crucial for improving the r.m.s. noise and structural sensitivity of the 86 GHz images, which will enable probing the rotation measure in regions with much weaker polarization signal and much steeper spectral index. Combined with the information on jet spectrum, opacity, and collimation, the polarization and rotation measure imaging will enable reconstructing the three-dimensional distribution of the magnetic field and making a founded judgement on its origin and the exact role in formation and acceleration of relativistic flows in AGN.

Investigators

Name	Institution
GBT Operator	Green Bank Observatory
Andrei Lobanov *	Max-Planck-Institut für Radioastronomie
Jose L. Gomez	Andalucía, Instituto de Astrofísica de
Kazunori Akiyama	Massachusetts Institute of Technology; Haystack Observatory
Thomas Krichbaum	Max-Planck-Institut für Radioastronomie
Tuomas Savolainen	Max-Planck-Institut für Radioastronomie; Aalto yliopisto
Keiichi Asada	Academia Sinica
Vincent Fish	Haystack Observatory
Gabriele Bruni	Istituto Nazionale di Astrofisica
Denise Gabuzda	Cork, University College
Rebecca Azulay	València, Universitat de
Ivan Agudo	Boston University; Joint Institute for Very Long Baseline Interferometry European Research Infrastructure Consortium; Andalucía, Instituto de Astrofísica de; Andalucía, Instituto de Astrofísica de
Eduardo Ros	Max-Planck-Institut für Radioastronomie; València, Universitat de
Tony Zensus	National Radio Astronomy Observatory; Max-Planck-Institut für Radioastronomie
Jae-Young Kim	Max-Planck-Institut für Radioastronomie; Kyungpook National University
Efthalia Traianou	Max-Planck-Institut für Radioastronomie; Köln, Universität zu; Andalucía, Instituto de Astrofísica de
Yuri Kovalev	Max-Planck-Institut für Radioastronomie
Laura Vega-Garcia	Max-Planck-Institut für Radioastronomie
Alan Marscher	Boston University
Svetlana Jorstad	Boston University
Rusen Lu	Max-Planck-Institut für Radioastronomie; Shanghai Astronomical Observatory, CAS
Kirill Sokolovsky	Illinois at Urbana-Champaign, University of
Antonio Fuentes	Andalucía, Instituto de Astrofísica de
Ivan Marti-Vidal	València, Universitat de

* indicates the PI