Speaker
Description
Magnetic fields are known to be involved in the launching of relativistic jets from supermassive black holes. While there is lack of knowledge on the precise jet launching mechanisms, both observations and simulations have recently provided us new information on the expected magnetic field structure at the jet launching region. Our work focuses on the polarization observations in the millimeter regime which show wavelength-dependence in the jet polarization properties, and thus give us information to map magnetic field structures near the jet base.
We present our work on ALMA observations of 3C120 for which spectro-polarimetric observations were conducted at 1.3mm and 2mm wavelengths. We have detected Faraday rotation measures of 170 000 radians per square meter in frequency range 137-153 GHz and 3 600 000 radians per square meter in frequency range 223-243 GHz. These data are used as input in Faraday rotation models which aim to identify both the Faraday dispersion mechanism(s) and the number of Faraday components in the source. We will present the results and conclusions of the study in the Nordic-Baltic Astronomy Days in May 2026.