Cosmic rays in the interstellar medium Cosmic rays (CRs) are high energy particles with with an energy density comparable to the other energy densities in the interstellar medium (ISM) and very distinct cooling and transport processes. The low cooling efficiency of CRs allows them to travel long distances from their location of acceleration. As a […]

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Galaxy morphology: how the growth of their bulge shapes the evolution of galaxies -- Almost a century after the publication of the Hubble sequence (Hubble 1926), that classifies galaxies according to their shapes and features, galaxy morphology remains a topical issue. Indeed, the structure of galaxies provide insight on how they acquire their mass, grow […]

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Towards simulating the Epoch of Reionization on exascale supercomputers --  The Epoch of Reionization (EoR) represents a fundamental phase transition in cosmic history, demanding sophisticated numerical simulations to interpret observations of the high-z Lyman alpha forest, combined with HST/JWST, and upcoming 21cm surveys. Our latest Cosmic Dawn III simulation has redefined the state-of-the-art by simultaneously […]

Mapping Extended Circumgalactic Lyα Nebulae Around Quasars With J-PAS --  Circum-Galactic Medium (CGM) is the gas surrounding galaxies outside their disksand inside their virial radii. Lyman-alpha (Lyα) emission is one of the most important spectral features for probing the CGM at high redshifts, providing crucial insights into the formation and evolution of galaxies and their […]

Title : Evolution of embedded protostars studied with submillimeter and near-infrared observations Abstract : Sun-like stars are thought to accrete most of their final mass during the protostellar phase, where the protostellar embryo is surrounded by an infalling dense envelope. The so-called Class 0 phase designates the youngest protostellar stage, where the accretion is thought […]

David Whitworth is a new postdoc at the ENS.

Unleashing the predictive power of tidal disruption events The tidal force from a supermassive black hole can disrupt a star passing too close, resulting in a powerful electromagnetic flare as the stellar debris fuels the compact object. Such tidal disruption events provide a unique window into the otherwise hidden population of quiescent supermassive black holes […]

En Salle des thèse à l’ENS.

The impact of stellar feedback on galaxies Small-scale stellar feedback can impact the large-scale evolution of galaxies by regulating star formation and by driving galactic fountain flows and outflows. Using modern high-performance computing simulations, we can study the relative importance of stellar winds, radiation, and supernovae in shaping the multi-phase interstellar medium. Using these simulations, […]