2019A&A...621A..18M


Query : 2019A&A...621A..18M

2019A&A...621A..18M - Astronomy and Astrophysics, volume 621A, 18-18 (2019/1-1)

Submillimeter polarization and variability of quasar PKS 1830-211.

MARTI-VIDAL I. and MULLER S.

Abstract (from CDS):

Polarization from active galactic nuclei is interpreted as a signpost of the role of magnetic fields in the launch and collimation of their relativistic radio jets. Here, we report the detection of a clear polarization signal from ALMA observations of the gravitationally lensed quasar PKS 1830-211 at submillimeter wavelengths (Band 9, 650GHz). Applying a differential-polarimetry technique to the two compact lensed images of the quasar, we estimate a fractional polarization of ∼5% for one lensed image, while the other appears nearly unpolarized, which implies that the polarization activity varies on a timescale of a few weeks. With additional ALMA Band 7 and 8 (between 300-500GHz) concomitant data, we constrain a Faraday rotation of a few 105rad/m2. We also observe flux-density variability of ≤10% within one hour in Band 9. This work illustrates that a differential analysis can extract high-accuracy information (flux-density ratio and polarimetry) free of calibration issues from resolved sources in the submillimeter domain.

Abstract Copyright: © ESO 2018

Journal keyword(s): polarization - techniques: polarimetric - radio continuum: galaxies - quasars: individual: PKS 1830-211

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2512 1
2 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5559 1
3 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3867 3
4 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 609 1
5 QSO B1921-293 BLL 19 24 51.0555700728 -29 14 30.118109640   18.71 18.21 15.07   ~ 766 0

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2022.05.26-01:39:19

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