Maio and Péroux simulations reveal early galaxies rapidly deplete gas
Updated
Updated · Space.com · May 4
Maio and Péroux simulations reveal early galaxies rapidly deplete gas
5 articles · Updated · Space.com · May 4
Using ColdSIM to model the first billion years after the Big Bang, the INAF, IFPU and ESO researchers found stars formed mainly from fresh infalling gas.
Their results suggest low stellar return fractions and much shorter gas depletion times than in modern galaxies, helping explain why JWST sees unexpectedly bright, massive young galaxies.
The work also shows cosmic gas shifted from a cold dense phase to a warmer diffuse one around reionization, offering predictions that JWST and future SKA observations can test.
Are JWST's 'monster' galaxies the norm, or just rare cosmic outliers that are skewing our models?
If galaxies matured faster, did the chemical ingredients for life appear much earlier in the universe?
As AI deciphers new telescope data, what unknown cosmic force will finally explain the birth of galaxies?
Early Galaxy Structures and Rapid Star Formation Efficiency in the Universe’s First Billion Years
Overview
The 2026 ALMA CRISTAL survey provided the first detailed maps of cold gas in galaxies over 12 billion years ago, revealing extended gas halos, clumpy star formation, and signs of both chaotic mergers and emerging disk rotation. Complementary simulations like ColdSIM and COLIBRE explained these observations by modeling rapid gas consumption, low recycling of stellar material, and the crucial role of dust in star formation. These findings show that early galaxies grew through mergers and formed complex structures quickly, while some, like the galaxy CRISTAL-10, exhibited rare conditions. Despite progress, mysteries remain, such as the origin of early black hole seeds, driving future work with higher-resolution simulations, multi-wavelength observations, and machine learning to refine galaxy formation models.