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Elbereth conference 2025

9–11 avr. 2025
Observatoire de Paris - Site de Meudon
Fuseau horaire Europe/Paris

Elbereth team

Session

Session 4

9 avr. 2025, 16:45
Amphithéâtre Evry Schatzman (Observatoire de Paris - Site de Meudon)

Amphithéâtre Evry Schatzman

Observatoire de Paris - Site de Meudon

Observatoire de Paris - Site de Meudon 5, place Jules Janssen 92195 MEUDON

Documents de présentation

Aucun document.

  1. 83. Turbulence in and around galaxy clusters
    Théo Lebeau (Institut d'Astrophysique Spatiale, Université Paris-Saclay)
    09/04/2025 16:45
    Astrophysics
    Oral presentation

    Galaxy clusters are the most massive gravitationally bound structures in the universe. They are mostly made of dark matter, inducing a deep gravitational potential well, in which baryons are accreted from the cosmic web and heated up to millions of Kelvins, we call it the Intra-Cluster Medium (ICM). Lots of complex and linked physics processes happen in the ICM, one of them is turbulence. In...

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  2. 96. Dynamical Heating by Superbubbles and the Cusp-Core Transformation
    Eunhee Ko (IAP)
    09/04/2025 17:00
    Astrophysics
    Oral presentation

    Recent JWST observations have revealed superbubbles (SBs)—cavity-shell structures distributed across the galactic disk—formed by successive supernova explosions. The potential fluctuations generated by SBs can dynamically heat galactic systems. Using the orbit-averaged Fokker-Planck equation, we investigate the role of SB-driven stochastic heating in the context of cusp-core transformation....

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  3. 54. Impact of the M31 merger on the timing argument estimate of the Local Group mass
    Istiak Hossain AKIB (Paris Observatory - PSL)
    09/04/2025 17:15
    Astrophysics
    Oral presentation

    The timing argument (TA) associates the motion of the Milky Way (MW) and Andromeda Galaxy (M31) to their internal gravity, and aims to find the total mass of the Local Group (LG). However, the classical TA always overestimates the LG mass, presumably because it ignores the hierarchical scenario and other interactions such as that with the Large Magellanic Cloud (LMC). This work focuses on the...

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  4. 94. The seperate universe approach to multifield inflation
    Hugo Holland (Institut d'Astrophysique Spatiale)
    09/04/2025 17:30
    Astrophysics
    Oral presentation

    Primordial black holes could constitute part or all of dark matter but they require large inhomogeneities to form in the early universe. These inhomogeneities can strongly backreact on the large scale dynamics of the universe. Stochastic inflation provides a way of studying this backreaction and getting an estimation of the abundance of primordial black holes. Because stochastic inflation...

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  5. 102. Zoom-in Numerical Simulations for Star Formation
    Georges Abboudeh (AIM - CEA Saclay)
    09/04/2025 17:45
    Astrophysics
    Oral presentation

    Star formation plays a crucial role in shaping its environment and is central to the evolution of planets, the interstellar medium, galaxies, and the universe as a whole. To bridge the gap between galactic-scale processes—where the initial conditions for star formation are set—and the formation of individual stars, we conducted state-of-the-art numerical simulations of a portion of a galaxy....

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