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View article: Instabilities at recollimation shocks in MHD jets
Instabilities at recollimation shocks in MHD jets Open
AGN jet structure and stability remain uncertain; recollimation shocks are linked to morphology and variability, but the role of downstream instabilities is still unclear. We aim to investigate how jet magnetization and other physical para…
View article: Standing Waves in Clouds: The Kelvin-Helmholtz Instability
Standing Waves in Clouds: The Kelvin-Helmholtz Instability Open
The Kelvin-Helmholtz instability (KHI) represents one of the most visually striking and scientifically significant fluid dynamic phenomena observable in Earth’s atmosphere. This paper examines the fundamental physics, observational charact…
View article: The polarization of the synchrotron radiation from a recollimated jet: Application to high-energy BL Lacs
The polarization of the synchrotron radiation from a recollimated jet: Application to high-energy BL Lacs Open
Multifrequency polarimetry, recently extended to the X-ray band thanks to the Imaging X-ray Polarimetry Explorer (IXPE) satellite, is an essential tool for understanding blazar jets. High-frequency-peaked BL Lacs (HBLs) and extreme high-fr…
View article: VLBA observations of a sample of low-power compact symmetric objects
VLBA observations of a sample of low-power compact symmetric objects Open
Compact symmetric objects (CSOs) are intrinsically compact extragalactic radio sources that are thought to be the progenitors of classical radio galaxies. To date, evolutionary models have mainly focused on the formation and growth of high…
View article: VLBA observations of a sample of low-power compact symmetric objects
VLBA observations of a sample of low-power compact symmetric objects Open
Compact symmetric objects (CSOs) are intrinsically compact extragalactic radio sources that are thought to be the progenitors of classical radio galaxies. To date, evolutionary models have mainly focused on the formation and growth of high…
View article: Relativistic reconnection with effective resistivity
Relativistic reconnection with effective resistivity Open
Context. Relativistic magnetic reconnection is one of the most fundamental mechanisms that is considered responsible for the acceleration of relativistic particles in astrophysical jets and magnetospheres of compact objects. Understanding …
View article: Relativistic reconnection with effective resistivity: I. Dynamics and reconnection rate
Relativistic reconnection with effective resistivity: I. Dynamics and reconnection rate Open
Relativistic magnetic reconnection is one of the most fundamental mechanisms considered responsible for the acceleration of relativistic particles in astrophysical jets and magnetospheres of compact objects. Understanding the properties of…
View article: A comparative study of radio signatures from winds and jets: modelling synchrotron emission and polarization
A comparative study of radio signatures from winds and jets: modelling synchrotron emission and polarization Open
Outflows driven by active galactic nuclei (AGNs) are seen in numerous compact sources; however, it has remained unclear how to distinguish between the driving mechanisms, such as winds and jets. Therefore, our study aims to offer observati…
View article: A comparative study of radio signatures from winds and jets: Modelling synchrotron emission and polarization
A comparative study of radio signatures from winds and jets: Modelling synchrotron emission and polarization Open
Outflows driven by active galactic nuclei (AGN) are seen in numerous compact sources; however, it has remained unclear how to distinguish between the driving mechanisms, such as winds and jets. Therefore, our study aims to offer observatio…
View article: Evolution of current- and pressure-driven instabilities in relativistic jets
Evolution of current- and pressure-driven instabilities in relativistic jets Open
Instabilities in relativistic magnetized jets are thought to be deeply connected to their energy dissipation properties and to the consequent acceleration of the non-thermal emitting relativistic particles. Instabilities lead to the develo…
View article: Evolution of current and pressure driven instabilities in relativistic jets
Evolution of current and pressure driven instabilities in relativistic jets Open
Instabilities in relativistic magnetized jets are thought to be deeply connected to their energy dissipation properties and to the consequent acceleration of the non-thermal emitting relativistic particles. Instabilities lead to the develo…
View article: Simulations of unstable recollimation shocks
Simulations of unstable recollimation shocks Open
3D relativistic (magneto)hydrodynamical simulations of the confinement of jets revealed that the jet-environment interface downstream of recollimation shocks is susceptible to instabilities that can be strong enough to destroy the jet stru…
View article: X-shaped radio galaxies: probing jet evolution, ambient medium dynamics, and their intricate interconnection
X-shaped radio galaxies: probing jet evolution, ambient medium dynamics, and their intricate interconnection Open
This review explores the field of X-shaped radio galaxies (XRGs), a distinctive subset of winged radio sources that are identified by two pairs of jetted lobes which aligned by a significant angle, resulting in an inversion-symmetric struc…
View article: X-Shaped Radio Galaxies: Probing Jet Evolution, Ambient Medium Dynamics, and Their Intricate Interconnection
X-Shaped Radio Galaxies: Probing Jet Evolution, Ambient Medium Dynamics, and Their Intricate Interconnection Open
This review explores the field of X-shaped radio galaxies (XRGs), a distinctive subset of winged radio sources that are identified by two pairs of jetted lobes which aligned by a significant angle, resulting in an inversion-symmetric struc…
View article: The different flavors of extragalactic jets: Magnetized relativistic flows
The different flavors of extragalactic jets: Magnetized relativistic flows Open
We performed three-dimensional numerical simulations of magnetized relativistic jets propagating in a uniform density environment in order to study the effect of the entrainment and the consequent deceleration, extending a previous work in…
View article: The different flavors of extragalactic jets: Magnetized relativistic flows
The different flavors of extragalactic jets: Magnetized relativistic flows Open
We perform three-dimensional numerical simulations of magnetized relativistic jets propagating in a uniform density environment in order to study the effect of the entrainment and the consequent deceleration, extending a previous work in w…
View article: FR0 jets and recollimation-induced instabilities
FR0 jets and recollimation-induced instabilities Open
Context. The recently discovered population of faint Fanaroff-Riley type 0 (FR0) radio galaxies has been interpreted as the extension to low power of the classical FRI sources. Their radio emission appears to be concentrated in very compac…
View article: FR0 jets and recollimation-induced instabilities
FR0 jets and recollimation-induced instabilities Open
The recently discovered population of faint FR0 radiogalaxies has been interpreted as the extension to low power of the classical FRI sources. Their radio emission appears to be concentrated in very compact (pc-scale) cores, any extended e…
View article: Magnetocentrifugal Mechanism of Pair Creation in AGN
Magnetocentrifugal Mechanism of Pair Creation in AGN Open
In this study, we examine the efficiency of pair creation by means of the centrifugal mechanism. The strong magnetic field and the effects of rotation, which always take place in Kerr-type black holes, guarantee the frozen-in condition, le…
View article: A polarization study of jets interacting with turbulent magnetic fields
A polarization study of jets interacting with turbulent magnetic fields Open
We investigate the effect of the jet’s immediate surroundings on the non-thermal synchrotron emission and its polarization properties. The ambient medium is equipped with a turbulent magnetic field, which is compressed and amplified by the…
View article: A polarization study of jets interacting with turbulent magnetic fields
A polarization study of jets interacting with turbulent magnetic fields Open
We investigate the effect of the jet's immediate surroundings on the non-thermal synchrotron emission and its polarization properties. The ambient medium is equipped with a turbulent magnetic field, which is compressed and amplified by the…
View article: Resistive relativistic MHD simulations of astrophysical jets
Resistive relativistic MHD simulations of astrophysical jets Open
Aims. The main goal of the present paper is to provide the first systematic numerical study of the propagation of astrophysical relativistic jets, in the context of high-resolution, shock-capturing Resistive Relativistic MagnetoHydroDynami…
View article: Magnetocentrifugal mechanism of pair creation in AGN
Magnetocentrifugal mechanism of pair creation in AGN Open
In the manuscript, we study the efficiency of pair creation by means of the centrifugal mechanism. The strong magnetic field and the effects of rotation, which always take place in Kerr-type black holes, guarantee the frozen-in condition, …
View article: Linear analysis of the Kelvin–Helmholtz instability in relativistic magnetized symmetric flows
Linear analysis of the Kelvin–Helmholtz instability in relativistic magnetized symmetric flows Open
We study the linear stability of a planar interface separating two fluids in relative motion, focusing on the symmetric configuration where the two fluids have the same properties (density, temperature, magnetic field strength, and directi…
View article: Particle acceleration with Magnetic Reconnection in large scale RMHD simulations: I. Current sheet identification and characterization
Particle acceleration with Magnetic Reconnection in large scale RMHD simulations: I. Current sheet identification and characterization Open
We present a new algorithm for the identification and physical characterization of current sheets and reconnection sites in 2D and 3D large scale relativisticmagnetohydrodynamic numerical simulations. This has been implemented in the PLUTO…
View article: The impact of resistive electric fields on particle acceleration in reconnection layers
The impact of resistive electric fields on particle acceleration in reconnection layers Open
In the context of particle acceleration in high-energy astrophysical environments featuring magnetic reconnection, the importance of the resistive term of the electric field compared to the convective one is still under debate. In this wor…
View article: The impact of resistive electric fields on particle acceleration in reconnection layers
The impact of resistive electric fields on particle acceleration in reconnection layers Open
In the context of particle acceleration in high-energy astrophysical environments featuring magnetic reconnection, the importance of the resistive term of the electric field compared to the convective one is still under debate. In this wor…
View article: Modelling X-shaped radio galaxies: Dynamical and emission signatures from the Back-flow model
Modelling X-shaped radio galaxies: Dynamical and emission signatures from the Back-flow model Open
Context. Active galactic nuclei typically show the presence of radio jets ranging from sub-kiloparsec to megaparsec scales. Some of these radio galaxies show distortion in their jets, forming tailed or winged sources. X-shaped radio galaxi…
View article: Modelling X-shaped Radio Galaxies: Dynamical and Emission Signatures from the Back-flow model
Modelling X-shaped Radio Galaxies: Dynamical and Emission Signatures from the Back-flow model Open
Some of the radio galaxies show distortion in their jets, forming tailed or winged sources. X-shaped radio galaxies are a subclass of winged sources formation mechanism of which is still unclear. The focus of this work is to understand hyd…
View article: Making Fanaroff-Riley I radio sources
Making Fanaroff-Riley I radio sources Open
Extragalactic radio sources appear under different morphologies, the most frequent ones are classified as Fanaroff-Riley type I (FR I), typically with lower luminosities, and Fanaroff-Riley type II, (FR II), typically more luminous. This s…