A5064939037- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Silicon and Solar Cell Technologies
- Astrophysics and Star Formation Studies
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Fluid Dynamics and Turbulent Flows
- Nuclear reactor physics and engineering
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- GNSS positioning and interference
Goethe University Frankfurt
2022-2024
National and Kapodistrian University of Athens
2022-2024
Magnetic reconnection is thought to be one of the main energy-dissipation mechanisms fueling energy plasma in vicinity a black hole. Indeed, plasmoids formed through magnetic may play key role $\gamma$-ray, X-ray and near-infrared flares from hole at center our galaxy, SgrA*. We report results three-dimensional general-relativistic ideal resistive magnetohydrodynamics simulations modelling accretion flows around astrophysical holes. As an important difference with similar works, discs have...
Understanding the creation of relativistic jets originating from active galactic nuclei (AGNs) requires a thorough understanding accompanying plasma instabilities. Our high-sensitivity, high-resolution, global, very-long-baseline-interferometry observations jet in radio galaxy have enabled us to study its inner morphology. We find that thread-like pattern can be described by Kelvin-Helmholtz instability, consisting four instability modes. model favours Mach number M_ j and sound speed α_ On...
Total intensity variability light curves offer a unique insight into the ongoing debate about launching mechanism of jets. For this work, we utilise availability radio and $\gamma$-ray over few decades source 3C 84 (NGC 1275). We calculate multiband time lags between flares identified in via discrete cross-correlation Gaussian process regression. find that jet particle magnetic field energy densities are equipartition ($k_\textrm{r} = 1.08\pm0.18$). The apex is located $z_\textrm{91.5 GHz}=...
ABSTRACT Binary neutron-stars mergers widely accepted as potential progenitors of short gamma-ray bursts. After the remnant merger has collapsed to a black hole, jet is powered and may breakout from matter expelled during collision subsequent wind emission. The interaction with ejecta affect its dynamics resulting electromagnetic counterparts. We here examine how an inhomogeneous anisotropic distribution affects such dynamics, dictating properties jet-ejecta cocoon afterglow radiated by upon...
Radio galaxies harbouring jetted active galactic nuclei are a frequent target of very-long-baseline interferometry (VLBI) because they play an essential role in exploring how jets form and propagate. Hence, only few have not been detected with VLBI yet; Fornax A is one the most famous examples. Here we present first detection compact core region VLBI. At 8.4 GHz faint consistent unresolved point source. We constrained its flux density to be $S_0 = 47.5-62.3\,\textrm{mJy}$ diameter...
Radio galaxies harbouring jetted active galactic nuclei are a frequent target of very long baseline interferometry (VLBI) because they play an essential role in our exploration how jets form and propagate. Hence, only few have not yet been detected with VLBI; Fornax A was one the most famous examples. Here we present first detection compact core region VLBI. At 8.4 GHz faint is consistent unresolved point source. We constrained its flux density to be S 0 = 47.5 − 62.3 mJy diameter D min ≤ 70...
The coincident detection of GW170817 and gamma-ray burst GRB170817A marked a milestone for the connection between binary neutron star (BNS) mergers short bursts (sGRBs). These can lead to formation black hole that is surrounded by disk generation powerful jet. It spends energy break free from merger ejecta, then portion it dissipated produce observable emissions. Our primary goal enhance our comprehension BNS constraining mass selection sGRBs. To do this, we used isotropic luminosity...
Context. The coincident detection of GW170817 and GRB170817A marked a milestone for the connection between binary neutron star (BNS) mergers short gamma-ray bursts (sGRBs). These can lead to formation black hole surrounded by disk generation powerful jet. It spends energy break free from merger ejecta, then portion it, is dissipated produce observable emissions. Aims. Our primary goal enhance our comprehension BNS constraining mass selection sGRBs, utilizing isotropic luminosity...
In this study, we focus on the simulation of accretion processes in Magnetically Arrested Disks (MADs) and investigate dynamics plasma during flux eruption events. We employ general relativistic magneto-hydrodynamic (GRMHD) simulations search for regions with a divergent velocity event. These would experience rapid significant depletion matter. For reason, monitor activation rate floor mass supply required stable evolution to further trace transient stagnation surface. Our findings reveal an...
Total intensity variability light curves offer a unique insight into the ongoing debate about launching mechanism of jets. For this work, we utilise availability radio and $γ$-ray over few decades source 3C 84 (NGC 1275). We calculate multiband time lags between flares identified in via discrete cross-correlation Gaussian process regression. find that jet particle magnetic field energy densities are equipartition ($k_\textrm{r} = 1.08\pm0.18$). The apex is located $z_\textrm{91.5 GHz}= 22 -...