James-Webb would already break the Hubble record for the most distant galaxy ever observed!

We know that James Webb Space Telescope has a mirror bigger than Hubble which allows him to see further and better than Hubble in L’infrared. But to have access to layer of light the oldest in cosmos observables, both instruments must use strong gravitational lensing.

As part of the Glass Observation campaign (Grism Lens-Amplified Survey from Space)them astrophysicists had already used the galaxy cluster Abell 2744 to see far and exploited its field gravity which deviates the light rays from stars in the background, like the lens of a magnifying glass.

As this video shows, Hubble already made gravitational lensing observations of the galaxy cluster Abell 2744. © Nasa, ESA and J. Lotz, M. Mountain, A. Koekemoer and the HFF team ( STScI)

Quite naturally, the members of Glass put their experience with Hubble to the service of the scientific community with the help of James-Webb, providing images that could be used by their colleagues.

These have just deposited an article on arXiv where they announce that in these images they have discovered two distant and already massive galaxies less than a billion years later big bang. One of them, called Glass-z13, would even be the oldest known to members of the noosphere, who would observe it today only between 300 and 400 million years after the Big Bang, which would break a record previously held by Hubble.

Large galaxies with already billions of stars

Among the members of the team that made the discovery of Glass-z13 areastronomer Pieter van Dokkum, known for his work on the puzzle of ultra-diffuse galaxies. Remember that cosmologists are used to expressing a distance for galaxies using The Milky Way using a parameter denoted “z” which is a measure of their spectral redshift, the higher z the larger galaxy is distant.

Pieter van Dokkum explains on his account Twitter : ” Here are the first results about the first luminous galaxies in the cosmos provided by JWST! Rohan Naidu and Pascal Oesch discovered two relatively bright galaxies in the first data broadcast at z=11-13, whileUniverse was only 2.5% of its current age. The preliminary conclusion, supported by work prior to a redshift slightly lower, the massive galaxy formation started early – which is good news for the prospects of finding things at even earlier times with JWST! The data is of such a quality that it is even possible to measure morphology of these extremely distant galaxies. The larger of the two is clearly resolved; it has an exponential profile with a radius of 0.7 kpc “.

The researchers’ paper says the two galaxies already appear to contain about 109 plenty sun in the form ofstars. Remember that one kpc (kiloparsec) roughly corresponds to 3,260 light years. Remarkable, Stacy McGaugh, the astrophysicist and cosmologist known for his work with WORLD and who is studying galaxies, dark matter and modified theories of gravity, had let it be known at the beginning of the year 2022 that, according to him, JWST would show us many large galaxies formed already early in the history of the observable cosmos, and that this could probably support the MOND theory rather than the existence of black matter.

We can also consult, although it is more technical, the explanations of Rohan Naidu on Twitter.

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