The first results from the James Webb Space Telescope have hinted at galaxies so early and so massive that they are in tension with our understanding of the formation of structure in the Universe. Various explanations have been proposed that may alleviate this tension. But now a new study from the C
James Webb in front of the galaxy cluster SMACS 0723, the first field of galaxies to be revealed from the telescope. Early results from the James Webb Space Telescope have revealed surprisingly large early galaxies that challenge current cosmic models. Credit: NASA, ESA, CSA, STScIhave hinted at galaxies so early and so massive that they are in tension with our understanding of the formation of structure in the Universe. Various explanations have been proposed that may alleviate this tension.
Their stellar masses could be overestimated. Or we could just have been lucky and somehow discovered the most massive of the galaxies at that time.But now Clara Giménez Arteaga, Ph.D. student at the Cosmic Dawn Center, proposes an effect that could further increase the tension: Galaxy cluster SMACS This image of galaxy cluster SMACS 0723 and its surroundings was the first image released from the James Webb Space Telescope in July 2023. The five zoom-ins are each roughly 19,000 lightyears across, and show galaxies seen some 13 billion years back in time. Careful analysis of these galaxies reveals that if we cannot resolve a galaxy, we may severely underestimate the total mass of its stars. Image credit: NASA, ESA, CSA, STScI / Giménez-Arteaga et al.
Stellar mass is one of the main properties used to characterize a galaxy, and Giménez-Arteaga’s result highlights the importance of being able to resolve the galaxies.
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