Simulating the evolution and emission of relativistic outflows

Salle de Conférence du Château

Salle de Conférence du Château

Observatoire de Paris, Site de Meudon 5 place Jules Janssen 92195 Meudon, France
Andreas Zech, Catherine Boisson, Cyril Tasse (GEPI), Hélène Sol (LUTH , OBSPM), Mathieu Servillat, Stefano Gabici (APC), Zakaria Meliani

Relativistic jets and outflows are astrophysical phenomena that occur at very different spatial scales in various sources linked to high-energy emission, such as AGN, GRBs, X-ray binaries and micro-quasars, as well as pulsars. 

The goal of this workshop is to get together experts on the physics of relativistic jets in Galactic and extragalactic objects in France and their associates, to compare our approaches and to reinforce exchanges between the different groups. The workshop will include a few presentations on the currently available observational data and will be primarily focusing on numerical modelling of the evolution of jets and their emission.

This workshop is partly financed by the Centre International d'Ateliers Scientifiques (CIAS) at the Observatoire de Paris. Relativistic jets represent of course a central research topic for the future Cherenkov Telescope Array (CTA) and the workshop has also received partial funding by the Action Fédératrice CTA at the Observatoire de Paris.



  • Andreas Zech
  • Anton Dmytriiev
  • Arthur Charlet
  • Benjamin Crinquand
  • Benoit Cerutti
  • Bruno Khelifi
  • Catherine Boisson
  • Christophe Sauty
  • Cyril Tasse
  • Fabien Casse
  • Frederic Vincent
  • Frédéric Daigne
  • Gabriel Emery
  • Gaëtan Fichet de Clairfontaine
  • Gilles Henri
  • Guillaume Dubus
  • Gustavo Rodriguez-Coira
  • Helene Sol
  • Jean-Philippe Lenain
  • Julien Malzac
  • Jérôme Guilet
  • Loïc Chantry
  • Martin Lemoine
  • Mathieu Servillat
  • Matteo Bugli
  • Matteo Cerruti
  • Olivier Hervet
  • Pierre-Olivier Petrucci
  • Raphaël Duque
  • Renaud Belmont
  • Susanna Vergani
  • Sébastien Lambert
  • Zakaria Meliani
  • Zeljka Bosnjak
  • Thursday, November 28
    • Welcome and Coffee
      • 1
        Welcome and Coffee
      • 2
        Speaker: Andreas Zech
    • Particle acceleration in relativistic jets
      • 3
        Generalised Fermi acceleration
        Speaker: Martin Lemoine (Institut d'Astrophysique de Paris, CNRS - Sorbonne U)
      • 4
        PIC / MHD simulations of relativistic shocks
        Speaker: Fabien Casse (APC - Université de Paris)
      • 5
        PIC simulations of magnetic reconnection
        Speaker: Benoit Cerutti (IPAG)
    • 11:00 AM
      Coffee break
    • Particle acceleration in relativistic jets
    • AGN - Observations
      • 7
        AGN observations with LOFAR
        Speaker: Cyril Tasse (GEPI)
      • 8
        Observations of jets with geodetic VLBI and link to Gaia

        Geodetic VLBI is a powerful technique that has been used for 40 years to monitor the Earth’s rotation and realize the terrestrial and celestial reference frames with an unprecedented precision (< 0.1 mas). Recently, it has permitted the construction of the third realization of the International Celestial Reference Frame (ICRF3) which is currently the most precise celestial reference frame. Recently also, Gaia provided an independent astrometric solution whose precision is, for the first time, comparable to VLBI, opening the way to comparisons of positions at various wavelengths. In this talk, I will show the signature of relativistic jets - and more generally of the source structure - in geodetic VLBI observations, and the systematics and offsets between VLBI and Gaia positions.

        Speaker: Sébastien Lambert (SYRTE, Observatoire de Paris)
    • 12:50 PM
      Lunch break Hall Uranie

      Hall Uranie

    • AGN - Jet models
      • 9
        Jet modelling in AGN and preparation of simulations.
        Speaker: Christophe Sauty
      • 10
        GRMHD modelling and radiative transfer
        Speaker: Gaëtan Fichet de Clairfontaine (LUTH Observatoire de Paris)
      • 11
        A jet model for describing the shadows of Sgr A* and M87*
        Speaker: Frédéric Vincent
    • AGN - Emission models
      • 12
        Emission modelling with stratified jets
        Speaker: Gilles Henri (IPAG/Observatoire de Grenoble/UGA)
    • 3:55 PM
      Coffee break
    • AGN - Emission models
  • Friday, November 29
    • Welcome and Coffee
    • AGN - Emission models
      • 15
        Hadronic emission modelling and multi-messengers
        Speaker: Dr Matteo Cerruti (Institut de Ciències del Cosmos - Universitat de Barcelona (ICCUB))
    • GRB - Observations
      • 16
        GRB Observations : MWL
        Speaker: Susanna Vergani (GEPI)
    • GRB - Emission models
      • 17
        Internal shock scenario for GRBs
        Speaker: Frédéric Daigne (Institut d'Astrophysique de Paris - Sorbonne Université)
    • 11:00 AM
      Coffee break
    • GRB - Emission models
      • 18
        Emission modelling at very high energies
        Speaker: Zeljka Bosnjak (FER - University of Zagreb, Croatia)
      • 19
        Relativistic ejections from binary neutron star mergers.
        Speaker: Raphaël Duque (Institut d'Astrophysique de Paris)
    • X-ray/gamma-ray binaries - Observations
      • 20
        XRB Observations: high energies
        Speaker: Guillaume Dubus (IPAG)
    • 12:50 PM
      Lunch break Hall Uranie

      Hall Uranie

    • X-ray/gamma-ray binaries - jet and emission models
      • 21
        The iInternal shock model applied to X-ray binaries.
        Speaker: Julien Malzac (IRAP (CNRS/Université de Toulouse/CNES))
      • 22
        An Accretion-Ejection Paradigm for Compact Objects
        Speaker: Pierre-Olivier Petrucci (IPAG)
      • 23
        Dynamical effects of radiative losses in high-mass microquasars
        Speaker: Arthur Charlet (CRAL, LUPM)
    • 3:20 PM
      Coffee break
    • Conclusions