Variability of the radio flux density of the Blazar S5 0716+714 on time scales less than a month

Gorshkov, A. G.; Ипатов, А. В.; Konnikova, V. K.; Mardyshkin, V. V.; Мингалиев, М. Г.; Finkel'Shteǐn, A. M.; Kharinov, M. A.

doi:10.1134/s106377291102003x

Cited by 10 publications

(2 citation statements)

References 14 publications

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“…S5 0716+714 is considered to be a typical BL Lac object. It shows flat powerlaw spectrum (α ≥ −0.5, S ν ∝ ν α in the radio band), as well as intraday variability in all spectral ranges: from 8-12 hours in radio band (6 cm, Gorshkov et al, 2011a;Gorshkov et al, 2011b) to 2.2-3.2 min flares in X-rays (Pryal et al, 2015). The observed polarization is also variable as within the night (e.g.…”

Section: Introductionmentioning

confidence: 93%

Intraday variability of the polarization vector in AGN S5 0716+714

Shablovinskaya¹,

Afanasiev²

2020

caosp

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The bright radio source S5 0716+714, which is usually classified as a BL Lac object, is one of the most intensively studied blazar. S5 0716+714 demonstrates extremely peculiar properties, such as the shortest time-scale of optical and polarimetric variations observed in blazars. In the given talk, we present the results of a 8-h polarimetric monitoring of S5 0716+714 with a ∼ 70-sec resolution carried out using the 6-m telescope BTA of the SAO RAS. The observation data analysis reveals the variability both in total and polarized light on the 1.5-hour timescales that specifies the size of the unresolved emitting region. The numerical model of polarization in jet with helical structure of magnetic field is suggested, and fitting the model reveals a magnetic field precession with a period of about 15 days.

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Section: Introductionmentioning

confidence: 93%

Intraday variability of the polarization vector in AGN S5 0716+714

Shablovinskaya¹,

Afanasiev²

2020

caosp

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“…Indirect estimates of its redshift have yielded z ≈ 0.31 (Bychkova et al 2006;Nilsson et al 2008), 0.2315 < z < 0.3407 (Danforth et al 2013), and z ≥ 0.52 (Sbarufatti et al 2005). This object is variable over the entire electromagnetic spectrum, on both short and long time scales (see, e.g., Wagner et al 1996;Raiteri et al 2003;Wu et al 2007;Poon et al 2009;Gorshkov et al 2011;Volvach et al 2012;Rani et al 2013;Liao et al 2014;Bychkova et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Periods of the Long-Term Variability of the Blazar 0716+714 and Their Inter-Correlations in a Helical Jet Model

Butuzova

2018

Astron. Rep.

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Various quasi-periods for the long-term variability of the radio emission, optical emission, and structural position angle of the inner part of the parsec-scale jet in the blazar 0716+714 have been detected. The relationships between these quasi-periods are interpreted assuming that the variability arises due to helical structure of the jet, which is preserved from regions near the jet base to at least 1 milliarcsecond from the core observed in radio interferometric observations. The radiating jet components should display radial motions with Lorentz factors of ≈ 3, and decelerate with distance from the jet base. The best agreement with the data is given in the case of non-radial motions of these components with a constant physical speed. It is also shown that the helical shape of the jet strongly influences correlations both between fluxes observed in different spectral ranges and between the flux and position angle of the inner part of the parsec-scale jet.

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

Shablovinskaya

Afanasiev

2018

Monthly Notices of the Royal Astronomical Society

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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 ∼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 the 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 ≈ 15 days.

show abstract

Variability of the radio flux density of the Blazar S5 0716+714 on time scales less than a month

Cited by 10 publications

References 14 publications

Intraday variability of the polarization vector in AGN S5 0716+714

Intraday variability of the polarization vector in AGN S5 0716+714

Periods of the Long-Term Variability of the Blazar 0716+714 and Their Inter-Correlations in a Helical Jet Model

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

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