Multi-wavelength study of flaring activity in BL Lac object S5 0716+714 during the 2015 outburst

Chandra, Sunil; Zhang, Haocheng; Kushwaha, Pankaj; Singh, K. P.; Bottcher, M.; Kaur, Navpreet; Baliyan, K. S.

doi:10.1088/0004-637X/809/2/130

Title: Multi-wavelength study of flaring activity in BL Lac object S5 0716+714 during the 2015 outburst

Journal Article · Mon Aug 17 00:00:00 EDT 2015 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/809/2/130· OSTI ID:1234911

Chandra, Sunil ^[1]; Zhang, Haocheng ^[2]; Kushwaha, Pankaj ^[1]; Singh, K. P. ^[1]; Bottcher, M. ^[3]; Kaur, Navpreet ^[4]; Baliyan, K. S. ^[4]

Tata Institute of Fundamental Research, Mumbai (India)
Ohio Univ., Athens, OH (United States); ; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
North-West Univ., Potchefstroom (South Africa)
Physical Research Lab., Ahmedabad (India)

We present a detailed investigation of the flaring activity observed from a BL Lac object, S5 0716+714 , during its brightest ever optical state in the second half of 2015 January. Observed almost simultaneously in the optical, X-rays, and γ-rays, a significant change in the degree of optical polarization (PD) and a swing in the position angle (PA) of polarization were recorded. A TeV (VHE) detection was also reported by the MAGIC consortium during this flaring episode. Two prominent sub-flares, peaking about five days apart, were seen in almost all of the energy bands. The multi-wavelength light curves, spectral energy distribution, and polarization are modeled using the time-dependent code developed by Zhang et al. This model assumes a straight jet threaded by large-scale helical magnetic fields taking into account the light travel time effects, incorporating synchrotron flux and polarization in 3D geometry. Furthermore, the rapid variation in PD and rotation in PA are most likely due to reconnections happening in the emission region in the jet, as suggested by the change in the ratio of toroidal to poloidal components of the magnetic field during the quiescent and flaring states.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1234911

Report Number(s):: LA-UR-15-24096

Journal Information:: The Astrophysical Journal (Online), Vol. 809, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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