ALMA full polarization observations of PKS1830-211 during its record-breaking flare of 2019
I. Marti-Vidal, S. Muller, A. Mus, A. Marscher, I. Agudo, J. L. Gomez

TL;DR
This study presents ALMA full-polarization observations of the lensed blazar PKS1830-211 during its 2019 flare, revealing polarization differences, intra-hour variability, and supporting magnetic turbulence models.
Contribution
First application of differential polarization analysis to a gravitationally lensed blazar during a flare, demonstrating its effectiveness in probing polarization properties.
Findings
Leading image has lower fractional polarization than trailing image.
Detected intra-hour polarization variability with a linear EVPA increase.
Differential polarization technique effectively characterizes polarization in lensed quasars.
Abstract
We report Atacama-Large-millimeter-Array (ALMA) Band 6 full-polarization observations of the lensed blazar PKS1830-211 during its record-breaking radio and gamma-ray flare in the spring of 2019. The observations were taken close to the peak of the gamma activity and show a clear difference in polarization state between the two time-delayed images. The leading image has a fractional polarization about three times lower than the trailing image, implying that significant depolarization occurred during the flare. In addition, we observe clear intra-hour variability of the polarization properties between the two lensed images, with a quasi-linear increase of the differential electric-vector position angle at a rate of about two degrees per hour, associated with changes of the relative fractional polarization of ~10%. This variability, combined with the lower polarization close to the peak of…
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