Multi-Physics of AGN Jets in the Multi-Messenger Era

Rani, B.; M., Petropoulou,; Zhang, Huan; D'Ammando, F.; Finke, J.; Baring, M.; Böttcher, M.; Dimitrakoudis, S.; Gan, Z.; Giannios, D.; Hartmann, D. H.; Krichbaum, T.P.; Marscher, A. P.; Mastichiadis, A.; Nalewajko, K.; Ojha, R.; Paneque, D.; Shrader, C.; Sironi, L.; Tchekhovskoy, A.; Thompson, D. J.; Vlahakis, N.; Venters, T. M.

doi:10.48550/arxiv.1903.04504

Cited by 1 publication

(2 citation statements)

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“…The coming era of multi-messenger time-domain astronomy will provide more high-quality multi-band synergetic observation data. By then, the studies of the multi-band activities for blazars will reveal a more complete picture of the energy dissipation mechanism in the jet (see, e.g., Rani et al 2019;Burns et al 2019).…”

Section: The Properties Of the Shockmentioning

confidence: 99%

“…Blazars, including BL Lac objects and flat-spectrum radio quasars (FSRQs), are the most extreme type of radio-loud active galactic nuclei (AGN); their relativistic jets point close to our line of sight, for which they possess distinctive observational characteristics, such as large amplitude and rapid variability, high and variable polarization, and compact radio emission (see, e.g., Urry & Padovani 1995;Massaro et al 2015;Padovani et al 2017). Their radiation spans the entire electromagnetic wave, and as non-catastrophic sources, they can be monitored for a long time, thus becoming one of the unique objectives in the era of multi-messenger astronomy (see, e.g., Rani et al 2019;Burns et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Exploring the Origin of Multiwavelength Activities of High-redshift Flat-spectrum Radio Quasar PKS 1502+106 during 2014–2018

Ding

Geng

et al. 2019

ApJ

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The origin of the multi-band activities (outbursts/flares) of blazars is still a heavily debated topic. Shock and magnetic reconnection have long been considered as possible triggers for the multi-band activities. In this paper, we present an exploration of the origin of multi-band activities for a high-redshift (z =1.8385) FSRQ PKS 1502+106. Utilizing multi-band data from radio to γ-ray and optical polarization observations, we investigate two dramatic activities in detail: a γ-ray dominated outburst in 2015 and an optical dominated outburst in 2017. Our main results are as follows. (I) A fast γ-ray flare with a flux-doubling time-scale as short as 1-hr in 2015 is discovered. Based on the variability time-scale, the physical parameters of the flaring region (e.g, minimum Doppler factor, emission region size, etc.) are constrained. At the peak of the flare, the γ-ray spectrum hardens to Γ γ = 1.82 ± 0.04 and exhibits an obvious curvature/break characteristic that is caused by the typical "cooling break". Modelings of multi-band SEDs reveal a very hard electronic energy spectrum with the electronic spectral index of 1.07 ± 0.53. This result suggests that this fast γ-ray flare may be triggered by magnetic reconnection. (II) During the outburst in 2017, the optical polarization degree and optical fluxes show a very tight correlation. By analyzing Stokes parameters of polarization observations, our results show that this outburst could be triggered by a transverse shock with a compression ratio of η > 2.2, and the magnetic field intensity of the shock emission region is about 0.032 G.

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Section: The Properties Of the Shockmentioning

confidence: 99%