The intraday variations of polarization vector direction in radio source S5 0716+714

Abstract

The bright radio source S5 0716+714, that is usually classified as BL Lac object, is one of the most intensively studied. S5 0716+714 demonstrates extremely peculiar properties such as the shortest time-scale of optical and polarimetric variations observed in blazars. In given paper, the results of 9-hour polarimetric monitoring of S5 0716+714 with the $\sim$70-second resolution, carried out by the 6-m telescope BTA of SAO RAS, are presented. The observation data analysis reveals the variability both in total and polarized light on the 1-1.5-hour time-scale. Since polarization is generated by plasma motion in the magnetic field, the variations of polarization vector are bounded with the magnetic field configuration and the average time-scales specify the size of the emitting region, unresolved directly. We suggest a processed numerically model of polarization in the jet with the precessing helical magnetic field. Fitting the model discovers that observed short-term variations with the complicated trajectory of polarization vector could be induced by the magnetic field precession with the period $T\approx 15$ days.

arXiv comment7 pages, 9 figures; submitted to MNRAS

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• A geometrical interpretation for the properties of multiband optical variability of the blazar S5 0716+714
• Stokes-polarimeter for 1-meter telescope
• Spectroscopy and polarimetry of the gravitationally lensed quasar Q0957+561
• Chromatic optical polarization of BL Lac: while faint and bright
• Active Galactic Nuclei in polarized light
• The Method of Searching for Rotations of the Polarization Position Angle of Quasars
• Intraday variability of the polarization vector in AGN S5 0716+714
• Determination of the Physical Parameters of AGNs in Seyfert 1 Galaxies LEDA 3095839 and VII Zw 244 Based on Spectropolarimetric Observations
• Object S5 0716+71: Flux - linear polarization coupling
• Intraday variations of polarization vector in blazars: a key to the optical jet structure?