According to a new study, the bright galaxies in the early universe may be less common than initially thought.
Researchers use the “Hubble” telescope to observe two galaxies that are thought to be far away, which we see more than 13 billion years back in time, at a young age of the universe.
Experts of the brightest reionizing galaxies (Borg) team found that Galaxy is a brighter source than seen over 13 billion years ago, as expected. But the other is “rogue” – nearby close galaxies were mistaken for one very far away because of their red color.
The effect, known as Red Shift, gives remote galaxies of different colors, showing how far they are. But some neighboring galaxies have some of the same colors that give the uncertainty of their distance.
Color The composite on the left is taken in the infrared light near and shows the position of the galaxies, the two candidate galaxies initially believe to be at a distance of more than 13.2 billion light years from the Earth. The images captured on the right show of two galaxies. In the top row containing the data used from the initial opening, while the lines below show with the colors using addition, the more precise observations. Based on data taken with NASA / ESA’s Hubble Space Telescope. (Credit: R Livermore, M Trent and BoRG via U. Melbourne)
This discovery – the known global bright-colored candidate galaxy is essentially fraudulent – has a profound impact on how galaxies form when the universe was in its infancy. the researchers said.
BoRG is designed to detect early galaxies. The Borg project’s Michele Trenti, an associate professor at Melbourne University and the Center for Excellence for Astrophysics for All-Sky Astrophysics, leads, all require the use of the Hubble Space Telescope to use multiple cameras simultaneously.
Trenti said that while another camera was in use Borg, users use a highly sensitive Wide Field Camera 3 to observe the skies for several hours. He said that repeating it over 100 times, we created a rich set of data that covers some unrelated parts of the universe, which raises the chances of landing a rare young galaxy.
“Looking at a distance in practice, let’s take a picture of a baby of a galaxy …”
Researchers examined the first two galaxies in the study as part of the Borg survey and reported the findings in a paper in the year 2016.
The latest study uses “Hubble” to look up these sources again to make a detailed measurement of colours of the two galaxies, by anticipating the expected range. One was just over 13 billion years ago when the universe was only 5% of its current age.
Astrophysicist Rachael Livermore, who led the study, following up Borg’s discovery, after saying the galaxy was “incredible” compared to its peers.
“This makes it a perfect destination for further study, so we really understand what is happening inside galaxies in the early years of the universe,” Livermore said.
The second Galaxy is considered the brightest galaxy found for the first time 650 million years after Big Bang, but it turned out to be a scam.
“Looking for something far away really allows us to make images of babies of galaxies that we can see how they have started, and then to understand how they evolved,” Livermore said. The kind of galaxy we see today. ”
“Now we have a better measure of things, now it seems that the bright galaxies are real close – see it only 9 billion years back in time, as it was before estimated at 13 billion.”
These galaxies are a natural target for the successor of the “Hubble” telescope “James Webb Space Telescope”, which is expected to be launch in 2021. The new telescope is designed to detect and characterize of the original galaxies, and the team hoped that Borg would be used for further research.
The latest studies have appeared in the Astrophysical Journal Letters.
Support for this work from Center for Excellence for All-Sky Astrophysics in 3 dimensions (Astro 3D) – A Research Center of Excellence that the Australian Research Council (ARC) and Six Collaborating Universities – Australian National University, University of Sydney, University of Melbourne, Swinburne University of Technology, the University of Western Australia and Curtin University- partially funded the study.