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  • Astrophysics  (1)
  • TBD  (1)
  • cosmic ray knee and ankle  (1)
  • 1
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-04
    Description: During the past few decades, plasma science has witnessed a great growth in laboratory studies, in simulations, and in space. Plasma is the most common phase of ordinary matter in the universe. It is a state in which ionized matter (even as low as 1%) becomes highly electrically conductive. As such, long-range electric and magnetic fields dominate its behavior. Cosmic plasmas are mostly associated with stars, supernovae, pulsars and neutron stars, quasars and active galaxies at the vicinities of black holes (i.e., their jets and accretion disks). Cosmic plasma phenomena can be studied with different methods, such as laboratory experiments, astrophysical observations, and theoretical/computational approaches (i.e., MHD, particle-in-cell simulations, etc.). They exhibit a multitude of complex magnetohydrodynamic behaviors, acceleration, radiation, turbulence, and various instability phenomena. This Special Issue addresses the growing need of the plasma science principles in astrophysics and presents our current understanding of the physics of astrophysical plasmas, their electromagnetic behaviors and properties (e.g., shocks, waves, turbulence, instabilities, collimation, acceleration and radiation), both microscopically and macroscopically. This Special Issue provides a series of state-of-the-art reviews from international experts in the field of cosmic plasmas and electromagnetic phenomena using theoretical approaches, astrophysical observations, laboratory experiments, and state-of-the-art simulation studies.
    Keywords: QB1-991 ; Q1-390 ; QC1-999 ; cosmic ray knee and ankle ; blazars ; numerical methods ; global jets ; MHD–accretion ; muti-messenger astronomy ; massive star supernovae ; galaxies: active ; TBD ; 26Al ; black holes ; accreting black holes ; particle-in-cell simulations ; kink-like instability ; laser-induced nuclear reactions ; magnetic fields ; magneto-hydrodynamics ; gamma-ray bursts ; active galactic nuclei ; accretion discs–jets ; numerical relativity ; plasma physics ; GRMHD ; high-power laser systems ; radio interferometry ; recollimation shocks ; effective lifetime ; multi-wavelength astronomy ; relativistic jets ; high energy astrophysics ; jets ; active galaxies ; relativistic astrophysics ; helical magnetic fields ; laser plasma ; X-ray binaries ; polarization ; the Weibel instability ; AGN ; neutrino astrophysics ; radiation mechanism: non-thermal ; nuclear astrophysics ; cosmic rays ; mushroom instability ; accretion disks ; MHD winds ; thema EDItEUR::P Mathematics and Science::PG Astronomy, space and time
    Language: English
    Format: application/octet-stream
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  • 2
    Publication Date: 2019-08-26
    Description: We present observations of a major outburst at centimeter, millimeter, optical, X-ray, and gamma-ray wavelengths of the BL Lacertae object AO 0235+164. We analyze the timing of multi-waveband variations in the flux and linear polarization, as well as changes in Very Long Baseline Array images at A = 7 mm with approx.0.15 milliarcsec resolution. The association of the events at different wavebands is confirmed at high statistical significance by probability arguments and Monte Carlo simulations. A series of sharp peaks in optical linear polarization, as well as a pronounced maximum in the 7 mm polarization of a superluminal jet knot, indicate rapid fluctuations in the degree of ordering of the magnetic field. These results lead us to conclude that the outburst occurred in the jet both in the quasi-stationary "core" and in the superluminal knot, both parsecs downstream of the supermassive black hole. We interpret the outburst as a consequence of the propagation of a disturbance, elongated along the line of sight by light-travel time delays, that passes through a standing recollimation shock in the core and propagates down the jet to create the superluminal knot. The multi-wavelength light curves vary together on long timescales (months/ years), but the correspondence is poorer on shorter timescales. This, as well as the variability of the polarization and the dual location of the outburst, agrees with the expectations of a multi-zone emission model in which turbulence plays a major role in modulating the synchrotron and inverse Compton fluxes.
    Keywords: Astrophysics
    Type: The Astrophysical Journal Letters; 735; 1
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