Garel et al. (2021) accepted for publication


A new SPHINX paper, “Lyman-𝛼 as a tracer of cosmic reionisation in the SPHINX radiation-hydrodynamics cosmological simulation” by Thibault Garel et al. has been accepted for publication in MNRAS. The paper addresses the question of whether the increase in Lyman-alpha (Lya) emitters with decreasing redshift is due to an evolution in galaxy properties or due to the decreasing Lya absorption by neutral gas in the inter-galactic medium (IGM). Little or no evolution is found in internal Lya emission or escape from galaxies, so the evolution in Lya emitters is pinned on the reionizing IGM.

SPHINX20 is coming!

Thanks to PRACE , we have received 54 million core-hours to perform the next SPHINX simulation on the JUWELS supercomputer at JSC. The SPHINX20 volume has a width of 20 co-moving Mpc, and is 8 times larger than our previous largest volume. This will give us a much better sample of galaxies to study the variations in the escape of ionizing radiation from galaxies, up to ten times higher galaxy masses than we could before.

SPHINX20 is now running and has reached redshift 11. Stay tuned!

The first SPHINX paper is on ArXiv

The first project paper has been submitted for publication and posted on ArXiv. The paper is named “The SPHINX Cosmological Simulations of the First Billion Years: the Impact of Binary Stars on Reionisation“. Here, we present the setup and physics of our simulation suite and address the question of whether and how binary stars affect reionisation. It turns out that due to mass transfer and mergers between binary companion stars, the escape fraction of ionising radiation from galaxies is significantly higher than without binary stars, and this leads to early reionisation (redshift >6), while the Universe fails to reionise before redshift 6 with single stars only.