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REBELS-25 is a very ancient galaxy (redshift z = 7.3065 ± 0.0001) that a multinational team led by Lucie Rowland has studied using ALMA facilities. This galaxy, in this new survey at a shorter wavelength, has shown an unexpected feature: its disk is rotating, right like what very much 'younger' galaxies are expected to exhibit. The present day cosmological model, indeed, contemplates that the oldest galaxies are characterized by an unordered rotation of their matter, and only after billions of years would they assume the 'classic shape' with arms rotating around a bulge or a bar. Having a mass of 8×109 M☉, REBELS-25, as we see it now, would be an age of 700 Myr from the Big Bang.[1]
References
edit- ^ Rowland, Lucie E.; et al. (7 October 2024). "REBELS-25: Discovery of a dynamically cold disc galaxy at z = 7.31". Monthly Notices of the Royal Astronomical Society. 535 (3): 2068–2091. doi:10.1093/mnras/stae2217.