Query : 2020A&A...638L..13M

2020A&A...638L..13M - Astronomy and Astrophysics, volume 638, L13-13 (2020/6-1)

ALMA full polarization observations of PKS 1830-211 during its record-breaking flare of 2019.


Abstract (from CDS):

We report Atacama Large Millimeter Array (ALMA) Band 6 full-polarization observations of the lensed blazar PKS 1830-211 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 in the differential electric-vector position angle at a rate of about two degrees per hour, associated with changes in the relative fractional polarization of ∼10%. This variability, combined with the lower polarization close to the peak of gamma activity, is in agreement with models of magnetic turbulence to explain polarization variability in blazar jets. Finally, the comparison of results from the full and differential polarization analysis confirms that the differential polarization technique (Marti-Vidal et al. 2016A&A...593A..61M) can provide useful information on the polarization state of sources like gravitationally lensed radio-loud quasars.

Abstract Copyright: © ESO 2020

Journal keyword(s): polarization - gamma rays: general - quasars: individual: PKS1830-211

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 QSO J1832-2039 BLL 18 32 11.0455806144 -20 39 48.210054948   18.56 20.2     ~ 66 1
2 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 648 1
3 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 837 0
4 QSO B1958-179 QSO 20 00 57.09043927 -17 48 57.6726139   18.02 18.60 15.33   ~ 255 1

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