Alexandre Marcowith
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View article: Are TeV-PeV observations unveiling the full extent of particle escape in pulsar-powered sources ?
Are TeV-PeV observations unveiling the full extent of particle escape in pulsar-powered sources ? Open
View article: On the confinement of electron-positrons in gamma-ray halos around pulsars: kinetic simulations
On the confinement of electron-positrons in gamma-ray halos around pulsars: kinetic simulations Open
View article: Two-moment cosmic ray transport in RAMSES
Two-moment cosmic ray transport in RAMSES Open
Cosmic rays (CRs) are an important source of feedback in a variety of astrophysical contexts. Magneto-hydrodynamical (MHD) simulations treating CRs as a fluid have shown that how their feedback operates is strongly dependent on their trans…
View article: Field line separation in 3D magnetic turbulence
Field line separation in 3D magnetic turbulence Open
View article: The Giant Radio Array for Neutrino Detection (GRAND) Collaboration -- Contributions to the 39th International Cosmic Ray Conference (ICRC 2025)
The Giant Radio Array for Neutrino Detection (GRAND) Collaboration -- Contributions to the 39th International Cosmic Ray Conference (ICRC 2025) Open
The Giant Radio Array for Neutrino Detection (GRAND) is an envisioned observatory of ultra-high-energy particles of cosmic origin, with energies in excess of 100 PeV. GRAND uses large surface arrays of antennas to look for the radio emissi…
View article: Pulsar+escape: the recipe for LHAASO sources ?
Pulsar+escape: the recipe for LHAASO sources ? Open
Observations of our Galaxy at very-high and ultra-high photon energies have revealed a rich population of sources, many of which have significant angular extension and/or are positionally coincident with energetic pulsars. We assessed whet…
View article: Impact of the ambipolar diffusion in the structuration of the magnetic Rayleigh Taylor instability with oblique magnetic field
Impact of the ambipolar diffusion in the structuration of the magnetic Rayleigh Taylor instability with oblique magnetic field Open
Aims . We investigate the impact of ambipolar diffusion on the development of the Rayleigh-Taylor instability (RTI) with an oblique magnetic field in the incompressible limit. Methods . We developed a general bi-fluid framework comprising …
View article: The Giant Radio Array for Neutrino Detection (GRAND) Collaboration -- Contributions to the 10th International Workshop on Acoustic and Radio EeV Neutrino Detection Activities (ARENA 2024)
The Giant Radio Array for Neutrino Detection (GRAND) Collaboration -- Contributions to the 10th International Workshop on Acoustic and Radio EeV Neutrino Detection Activities (ARENA 2024) Open
This is an index of the contributions by the Giant Radio Array for Neutrino Detection (GRAND) Collaboration to the 10th International Workshop on Acoustic and Radio EeV Neutrino Detection Activities (ARENA 2024, University of Chicago, June…
View article: Extended gamma-ray emission from particle escape in pulsar wind nebulae
Extended gamma-ray emission from particle escape in pulsar wind nebulae Open
Context. There is growing evidence from gamma-ray observations at high and very high energies that particle escape is a key aspect shaping the morphological properties of pulsar wind nebulae (PWNe) at various evolutionary stages. Aims. We …
View article: Extended gamma-ray emission from particle escape in pulsar wind nebulae -- Application to HESS J1809-193 and HESS J1825-137
Extended gamma-ray emission from particle escape in pulsar wind nebulae -- Application to HESS J1809-193 and HESS J1825-137 Open
There is growing evidence from gamma-ray observations at high and very high energies that particle escape is a key aspect shaping the morphological properties of pulsar wind nebulae (PWNe) at various evolutionary stages. We aim to provide …
View article: Diffusive shock acceleration in relativistic, oblique shocks
Diffusive shock acceleration in relativistic, oblique shocks Open
Cosmic rays are charged particles that are accelerated to relativistic speeds by astrophysical shocks. Numerical models have been successful in confirming the acceleration process for (quasi-)parallel shocks, which have the magnetic field …
View article: Kinetic simulations of electron–positron induced streaming instability in the context of gamma-ray halos around pulsars
Kinetic simulations of electron–positron induced streaming instability in the context of gamma-ray halos around pulsars Open
Context. The possibility of slow diffusion regions as the origin for extended TeV emission halos around some pulsars (such as PSR J0633+1746 and PSR B0656+14) challenges the standard scaling of the electron diffusion coefficient in the int…
View article: Kinetic simulations of electron-positron induced streaming instability in the context of gamma-ray halos around pulsars
Kinetic simulations of electron-positron induced streaming instability in the context of gamma-ray halos around pulsars Open
The possibility of slow diffusion regions as the origin for extended TeV emission halos around some pulsars (such as PSR J0633+1746 and PSR B0656+14) challenges the standard scaling of the electron diffusion coefficient in the interstellar…
View article: Impacts of energetic particles from T Tauri flares on inner protoplanetary discs
Impacts of energetic particles from T Tauri flares on inner protoplanetary discs Open
T Tauri stars are known to be magnetically active stars subject to strong flares observed in X-rays. These flares are likely due to intense magnetic reconnection events during which a part of the stored magnetic energy is converted into ki…
View article: The role of heating in the formation and the dynamics of YSO jets
The role of heating in the formation and the dynamics of YSO jets Open
Context. Theoretical arguments as well as observations of young stellar objects (YSOs) support the presence of a diversified circumstellar environment. A stellar jet is thought to account for most of the stellar spin down and disk wind out…
View article: Bell Instability-Mediated Diffusive Shock Acceleration at Supernova Blast Wave Shock Propagating in the ISM
Bell Instability-Mediated Diffusive Shock Acceleration at Supernova Blast Wave Shock Propagating in the ISM Open
Supernova blast wave shock is a very important site of cosmic-ray acceleration. However, the detailed physical process of acceleration, in particular, non-linear interplay between cosmic-ray streaming and magnetic field amplification has n…
View article: Diffusive shock acceleration in relativistic, oblique shocks
Diffusive shock acceleration in relativistic, oblique shocks Open
Cosmic rays are charged particles that are accelerated to relativistic speeds by astrophysical shocks. Numerical models have been successful in confirming the acceleration process for (quasi-)parallel shocks, which have the magnetic field …
View article: Bell Instability–mediated Diffusive Shock Acceleration at Supernova Blast Wave Shock Propagating in the Interstellar Medium
Bell Instability–mediated Diffusive Shock Acceleration at Supernova Blast Wave Shock Propagating in the Interstellar Medium Open
Supernova blast wave shock is a very important site of cosmic-ray acceleration. However, the detailed physical process of acceleration, in particular, nonlinear interplay between cosmic-ray streaming and magnetic field amplification, has n…
View article: The role of heating on the formation and the dynamics of YSO jets : I. A parametric study
The role of heating on the formation and the dynamics of YSO jets : I. A parametric study Open
Theoretical arguments as well as observations of young stellar objects (YSO) support the presence of a diversified circumstellar environment. A stellar jet is thought to account for most of the stellar spin down and disk wind outflow for t…
View article: Evidence for <i>γ</i>-ray emission from the remnant of Kepler’s supernova based on deep H.E.S.S. observations <i>(Corrigendum)</i>
Evidence for <i>γ</i>-ray emission from the remnant of Kepler’s supernova based on deep H.E.S.S. observations <i>(Corrigendum)</i> Open
International audience
View article: Exploring Neutral Hydrogen in Radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and Prospects with the SKA
Exploring Neutral Hydrogen in Radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and Prospects with the SKA Open
Empirical studies of cold gas content are essential for comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on various physical propert…
View article: Exploring neutral hydrogen in the radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and prospects with the SKA
Exploring neutral hydrogen in the radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and prospects with the SKA Open
The empirical studies of cold gas content serve as an essential aspect in comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on variou…
View article: Grandlib: A Simulation Pipeline for the Giant Radio Array for Neutrino Detection (Grand)
Grandlib: A Simulation Pipeline for the Giant Radio Array for Neutrino Detection (Grand) Open
View article: Cosmic-Ray-modified and driven instabilities
Cosmic-Ray-modified and driven instabilities Open
These lectures address the effects of Cosmic Rays over macro-instabilities which develop in the interstellar medium and the micro-instabilities the particles are able to trigger themselves. The lectures are centered on the derivation of li…
View article: Gamma-ray luminosity/star-formation rate correlations in the context of the Cherenkov Telescope Array
Gamma-ray luminosity/star-formation rate correlations in the context of the Cherenkov Telescope Array Open
Star-forming galaxies (SFGs) are unique gamma-ray emitters. The observed correlation between their non-thermal luminosity and their star-formation rate (SFR) strongly suggests that these gamma rays result from the interactions of cosmic ra…
View article: Using PIC and PIC-MHD to investigate cosmic ray acceleration in mildly relativistic shocks
Using PIC and PIC-MHD to investigate cosmic ray acceleration in mildly relativistic shocks Open
Astrophysical shocks create cosmic rays by accelerating charged particles to\nrelativistic speeds. However, the relative contribution of various types of\nshocks to the cosmic ray spectrum is still the subject of ongoing debate.\nNumerical…
View article: Using PIC and PIC-MHD to investigate cosmic ray acceleration in mildly relativistic shocks
Using PIC and PIC-MHD to investigate cosmic ray acceleration in mildly relativistic shocks Open
Astrophysical shocks create cosmic rays by accelerating charged particles to relativistic speeds. However, the relative contribution of various types of shocks to the cosmic ray spectrum is still the subject of ongoing debate. Numerical st…
View article: Ionization of inner T Tauri star discs: effects of<i>in situ</i>energetic particles produced by strong magnetic reconnection events
Ionization of inner T Tauri star discs: effects of<i>in situ</i>energetic particles produced by strong magnetic reconnection events Open
Magnetic reconnection is one of the major particle acceleration processes in space and astrophysical plasmas. Low-energy supra-thermal particles emitted by magnetic reconnection are a source of ionization for circumstellar discs, influenci…
View article: Constraints on the Intergalactic Magnetic Field Using Fermi-LAT and H.E.S.S. Blazar Observations
Constraints on the Intergalactic Magnetic Field Using Fermi-LAT and H.E.S.S. Blazar Observations Open
Magnetic fields in galaxies and galaxy clusters are believed to be the result of the amplification of intergalactic seed fields during the formation of large-scale structures in the universe. However, the origin, strength, and morphology o…
View article: Ionisation of inner T Tauri star discs: effects of in-situ energetic\n particles produced by strong magnetic reconnection events
Ionisation of inner T Tauri star discs: effects of in-situ energetic\n particles produced by strong magnetic reconnection events Open
Magnetic reconnection is one of the major particle acceleration processes in\nspace and astrophysical plasmas. Low-energy supra-thermal particles emitted by\nmagnetic reconnection are a source of ionisation for circumstellar discs,\ninflue…