Multi-wavelength flux variability from relaxation wave in relativistic jet
Creators: name: Fichet de Clairfontaine, Gaëtan
name: Meliani, Zakaria
name: Zech, Andreas
Publisher: name: Zenodo
Year: 2021
Subjects: special relativity hydrodynamics (SRHD) - ISM: jets and outflows - radiation mechanisms: nonthermal - galaxies: active - methods : numerical

description: Multi-wavelength flux variabilities observed in parsec-scale relativistic jets are most often attributed to the diffusive acceleration of a population of relativistic electrons on internal shocks. The observed time-scale of variability depends on the frequency, with several orders of magnitudes between radio and X band. The modeling of jet is done with the SRHD code AMRVAC with the treatment of particle injection. To that, we couple treatment of radiative transfer to study the flux coming from a relativistic jet considering a turbulent magnetic field. We follow the propagation of a moving shock wave interacting with a standing shock structure inside the jet.<br> Synchrotron emission and radiative transfer are calculated in post-treatment (Riptide code) for given observation angles and frequencies. We show the emergence of flare events at various frequencies with various time-scales during the interaction between moving and standing shock.<br> In addition, we highlight the emission signature coming from relaxation waves forming and propagating due to the jet relaxation. We demonstrate the appearance of a moving, expanding funnel structure behind the moving shock where rarefaction regions can form and dominate the flux emission under certain conditions with emergence of flares echoes.
description: {"references": ["Biretta, J. A. et al. (2002). Evidence for initial jet formation by an accretion disk in the radio galaxy M87. New Astronomy Reviews, Volume 46, Issue 2-7, p. 239-245.", "Fichet de Clairfontaine, G. et al. (2021). Flux variability from ejecta in structured relativistic jets with large-scale magnetic fields. Astronomy &amp; Astrophysics, Volume 647, id.A77, 18 pp", "Ghisellini, G. et al. (2014). The power of relativistic jets is larger than the luminosity of their accretion disks. Nature, Volume 515, Issue 7527, pp. 376-378 (2014)", "Gomez, J. L. et al. (1997). Hydrodynamical Models of Superluminal Sources.The Astrophysical Journal, Volume 482, Issue 1, pp. L33-L36.", "Katarzynski, K. et al. (2001). The multifrequency emission of Mrk 501. From radio to TeV gamma-rays. Astronomy and Astrophysics, v.367, p.809-825 (2001).", "Keppens, R. et al. (2012). Parallel, grid-adaptive approaches for relativistic hydro and magnetohydrodynamics. Journal of Computational Physics, Volume 231, Issue 3, p. 718-744.", "Roy, N. et al. (2019). Probing the jets of blazars using the temporal symmetry of their multiwavelength outbursts. Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 1, p.743-757.", "van Eerten, H. J. et al. (2010). Gamma-ray burst afterglows from transrelativistic blast wave simulations. Monthly Notices of the Royal Astronomical Society, Volume 403, Issue 1, March 2010, Pages 300\u2013316.", "Zanotti, O. et al. (2010). Electromagnetic counterparts of recoiling black holes: general relativistic simulations of non-Keplerian discs. Astronomy and Astrophysics, Volume 523, id.A8, 16 pp."]}