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The James Webb Space Telescope spotted some of the first galaxies

“Everything we see is new,” says Tommaso Treu, principal investigator of one of the Webb programs at the University of California, Los Angeles. “Webb shows that there is a very rich universe beyond what we imagined. The universe surprised us once again. These early galaxies are unusual in many ways.

Two research papers by Marco Castellano from the Italian National Institute of Astrophysics and Rohan Naidu from Harvard & Smithsonian Institute of Astrophysics and Cambridge – Massachusetts Institute of Technology have been published in Astrophysical Journal Letters.


Popular Science published in Turkish The first content findings come from a large-scale Webb research initiative involving two Early Release Science (ERS) programs. These programs are stated to be Grism Lens Enhanced Space Observation (GLASS) and Cosmic Evolution Early Broadcast Science Observation (CEERS).

In just four days of analysis, the researchers discovered two unusually bright galaxies in the GLASS-JWUT images. These galaxies existed between 450 and 350 million years after the big bang (redshift ratios of 10.5 and 12.5, respectively). But future spectral measurements with Webb will help confirm their age.

Speaking of the outermost GLASS galaxy, called GLASS-z12, which is thought to date back 350 million years after the big bang, Naidu says, “Web and I are excited to find starlight coming from further far than anyone has ever seen before.” The previous record holder was the galaxy GN-z11, which existed 400 million years after the big bang (redshift 11.1) and was determined in 2016 by Hubble and the Keck Observatory in their deep sky programs.

“Based on all of these predictions, we thought we needed to search a much larger volume of space to find galaxies like this,” Castellano says.

“These observations are mind-boggling,” says Paola Santini, the paper’s fourth author. “We have entered a new era of astronomy. It’s like doing an archaeological dig and suddenly finding a lost city or something you don’t know about. It is a shocking event. »

Source: Cumhuriyet

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