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and our understanding of how galaxies form The nature of dark matter The Milky Way, more than 11 billion years ago, could be completely disturbed after new observations of a massive stellar population that shouldn’t exist.
JWST-7329: A rare massive galaxy that formed very early in the universe. This JWST NIRCAM image shows a red disk galaxy, but it is difficult to distinguish it from other objects with images alone. Spectral analysis of its light with JWST revealed its unusual nature – it formed about 13 billion years ago even though it contains ~4x more mass in stars than our Milky Way today.
Oh Paper published in The nature Details results using the new James Webb Space Telescope (JWST) data. The results show that a very large galaxy in the early universe – observed 11.5 billion years ago (cosmic redshift of 3.2) – is an extremely old population of stars that formed 1.5 billion years ago (about 11 redshift of ). This observation improves existing modelling, as not enough dark matter is formed to seed their formation.
Swinburne University of Technology Distinguished Professor Carl Glazebrook led the research and the international team that used JWST to make spectroscopic observations of this giant quiescent galaxy.
“We’ve been following this particular galaxy for seven years and spent hours observing it with two of the largest telescopes on Earth to determine how old it is. But it was very red and very faint. , and we couldn’t measure it. Finally, we had to go away from Earth and use JWST to confirm its nature.
The formation of galaxies is a fundamental model underpinning modern astrophysics and predicts a sharp decline in the number of massive galaxies in the early universe. Supermassive quiescent galaxies have now been observed one to two billion years after the Big Bang, challenging previous theoretical models.
Distinguished Professor Glazebrook worked with leading researchers from around the world, including Dr Themiya Nanayakkara, Dr Lalitwadi Kavannachakej, Dr Colin Jacobs, Dr Harry Chittenden, Associate Professor Glenn G. Kaczprzak and Associate Professor Ivo Leibstroin at the Super One Labs Centre. are from
“This has been a team effort, from the infrared sky survey launched in 2010, which led us to identify this galaxy as unusual, to our many hours at Keck and the Very Large Telescope where we Tried, but failed to confirm it, until finally last year where we put a lot of effort into processing the JWST data and analyzing the spectrum.
“We are now moving beyond what was possible to confirm the oldest silent giant in the universe,” says Dr Themiya Nanayakkara, who led the spectral analysis of the JWST data.
“This pushes the limits of our current understanding of how galaxies form and evolve. The key question now is how they form so early in the Universe and what mysterious mechanisms prevent them from forming stars when they do.” The rest of the universe does.
Associate Professor Claudia Lagos from the University of Western Australia node of the International Center for Radio Astronomy Research (ICRAR) was instrumental in developing the theoretical modeling of the evolution of the dark matter concentration for the study.
“Galaxy formation largely depends on how dark matter is concentrated,” she says. “The existence of these very massive galaxies so early in the Universe poses significant challenges to our standard model of cosmology. This is because we don’t think these massive galaxies could have hosted such massive dark matter structures. still have time to form. More observations are needed to understand how common these galaxies may be and to help us understand how massive these galaxies are.
Distinguished Professor Glazebrook hopes this could be a new beginning for our understanding of the physics of dark matter.
“JWST is finding increased evidence of massive galaxy formation early in time. This result sets a new record for this phenomenon. Although it is very surprising, it is only one thing. But we further And if we do, that will really upset our ideas of galaxy formation.
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