Galaxies within the early universe have fewer metals than anticipated. Observations from the James Webb House Telescope (JWST) present that these galaxies don’t observe a basic rule about galaxy evolution that works within the comparatively close by – and due to this fact comparatively latest – universe.
Kasper Heintz on the College of Copenhagen in Denmark and his colleagues used JWST to take a look at 16 galaxies, all of which shaped inside the first 750 million years after the large bang. They discovered that these galaxies have fewer heavy parts, or metals as they’re known as in astronomy, than we’d count on based mostly on our understanding of nearer galaxies.
“The physics that drives galaxy formation and evolution at these early epochs should be drastically completely different than what we observe at the moment,” says Heintz. Some simulations predicted this phenomenon, and different observations hinted at it, however that is the primary stable proof.
The observations recommend that these galaxies are diluted by pristine fuel with out metals in it. They’re probably born as we’d count on: with metallic abundances which can be comparatively, however not abnormally, low. Then they gobble up fuel from the encompassing intergalactic materials.
This implies these galaxies aren’t as unbiased of their environment as those we see within the close by universe. “If we’re to grasp galaxy evolution on the earliest epochs, we are able to now not deal with them as particular person ‘ecosystems’,” says Heintz. “We now have to keep in mind their intimate connection to the encompassing intergalactic or cirgumgalactic fuel.”
This isn’t the primary anomaly JWST noticed in early galaxies – the telescope additionally discovered that they’re much more huge and ample than we had anticipated. The brand new observations may really make the issues with our understanding worse, as a result of the massive quantities of fuel required to dilute early galaxies would make them much more shockingly huge.
- James Webb house telescope