Pierre Franck PISERCHIA
Pierre Franck PISERCHIA has been working as a research engineer at “Commissariat à l’Energie Atomique et aux Energies Alternatives” since 1999.
He was involved in Computational Earth Sciences, and in the French National Data Center for the Comprehensive Test Ban Treaty.
He also worked with teams on middleware (programming models/runtime, data management and I/O), problem solving software (data processing, visualization, meshing,…), numerical analysis and large scientific codes development.
He was strongly involved in the creation of the LIHPC.
Astronomy and Astrophysics, Volume 643, 2020
abstract
Abstract
We present the Extreme-Horizon (EH) cosmological simulation, which models galaxy formation with stellar and active galactic nuclei (AGN) feedback and uses a very high resolution in the intergalactic and circumgalactic medium. Its high resolution in low-density regions results in smaller-size massive galaxies at a redshift of z = 2, which is in better agreement with observations compared to other simulations. We achieve this result thanks to the improved modeling of cold gas flows accreting onto galaxies. In addition, the EH simulation forms a population of particularly compact galaxies with stellar masses of 10 ¹⁰⁻¹¹ M⊙ that are reminiscent of observed ultracompact galaxies at z ≃ 2. These objects form primarily through repeated major mergers of low-mass progenitors and independently of baryonic feedback mechanisms. This formation process can be missed in simulations with insufficient resolution in low-density intergalactic regions.
Computers & Fluids, Elsevier, p. 765-777, 2009