The James Webb telescope has discovered a cosmic monster that challenges assumptions about the early universe


James Webb Telescope
This discovery of the James Webb telescope could already be seen by the Hubble telescope.
Joana Campos Joana Campos Weathered Portugal 6 minutes

He posted a new picture James Webb Space Telescope (JWST) shows a massive, dusty galaxy producing hundreds of stars a year, challenging previous hypotheses about the rarity of such explosions in the early universe. Artists’ impressions describe AzTECC71 as a ghostly entity, suggesting possible changes in scientists’ understanding of the expansion of star formation.

AzTECC71: a galaxy of dust challenges the early universe

Astronomers Collaboration COSMOS-Web identified AzTECC71, a star-forming dust galaxy that develops numerous starsbut its visibility is obstructed by a veil of dust. It could have formed nearly a billion years after the big bang.

Although such galaxies were thought to be rare in the early universe, this discovery, along with more than a dozen other candidates, calls into question previously hypothesized, suggesting they may be three to ten times more common than expected.

Described as “The Real Monster” by Jed McKinney, postdoctoral researcher at University of Texas on Austin, AzTECC71 forms hundreds of stars each year, offers potential insight into a hidden population of galaxies.

If confirmed, this conclusion could indicate that the early universe contained much more dust than previously thought. Project COSMOS-Webwhich was co-led by the docent UT’s Caitlin Casey, it aims to map up to 1 million galaxies in an area of ​​sky the size of three full moons.

In order to study the first structures of the universe, a team of more than 50 researchers, received 250 hours of observations during the first year of JWST, will receive the first batch of data in December 2022, with further data expected by January 2024.

Dusty star-forming galaxies such as AzTECC71 are difficult to observe in optical light due to the absorption and re-emission of dust at longer wavelengths. Before JWST, these galaxies were called “Hubble Dark Galaxy”. McKinney highlights biases in understanding the evolutionary history of galaxies, as previous observations were limited to non-obscured and less dusty galaxies.

AzTECC71 it was originally detected as a speck of dust emission from the telescope James Clerk Maxwell in Hawaii and later confirmed by data from the ALMA telescope in Chile JWST observations at a wavelength of 4.44 microns revealed a faint galaxy in the same location, underscoring the new telescope’s ability to discover previously unseen cosmic objects.

JWST galactic revelations reveal cosmic dust

Dusty galaxies, often elusive by optical observation due to absorption and dust re-emission, are now within reach thanks to JWST and its advanced infrared capabilities.

This powerful telescope can penetrate thick veils of dust, allowing scientists to study the properties of these heavily obscured galaxies in both the optical and infrared spectra. JWST’s sensitivity not only extends our view to the farthest reaches of space, but also reveals the mysteries hidden behind thick layers of cosmic dust..

While no telescope has ever seen beyond cosmic dust, JWST is capable of making observations in both the optical and infrared spectrums.

A research team led by astronomers McKinney AND Casey from UT Austin, aims to explore and understand the nature of these dusty galaxies. Thanks to JWST’s ability to penetrate dust, the team can delve into the details of the formation and evolution of these galaxies, providing valuable information about a previously hidden population of space objects.

This represents a significant advance in our observational capabilities, allowing us to reveal the secrets of galaxies that were once shrouded in cosmic dust, expanding our understanding of the early universe.

News reference
McKinney J, Manning S, Cooper O, et al. Near-infrared faint, far-infrared glowing Dusty Galaxy at z ~ 5 in COSMOS-Web. The Astrophysical Journal (2023).


Source link

Leave a Comment