Speaker
Description
Magnetic fields are thought to play a crucial role in both launching and collimation of blazar jets. 3C273 is our nearest high-power radio-loud quasar, and as such it has been extensively studied since the 1960s. ALMA has opened a new window for studying the jet of 3C273 at millimeter wavelengths. I will present results from a recent study where we have observed both the nucleus and the kpc-scale jet of 3C273 with ALMA at 2mm, 1.3mm and 0.8mm wavelengths. Through modeling the core polarization observations, we identify multiple polarized components contributing to the Faraday rotation in the source. We also detect variability in the Faraday rotation when compared to observations conducted 2 years earlier. Our observations also resolve the kpc-scale magnetic field structure in the mm-wavelenghts for the first time, revealing a complex magnetic field structure around the hotspot region, similar to previous centimeter wavelength observations.