Astronomers discover new hidden galaxy clusters


A team of astronomers from the Massachusetts Institute of Technology (MIT) have discovered new and unusual galactic neighborhoods that previous studies have overlooked, and their findings, published in The Astrophysical Journal, indicate that approximately 1% of galaxy clusters appear atypical and can easily be misidentified. As one bright galaxy.

According to the “RT” website, galaxy clusters contain hundreds or even thousands of galaxies linked to each other by gravity, as they move through a sea of ​​hot gases, called the middle of the inner cluster, and emit X-rays that can be seen using space telescopes.

Also, this radiation usually creates a mysterious X-ray halo around galaxy clusters, which makes it easy to recognize and distinguish from an object that has a single source of X-rays, such as a star or quasar.

However, some galactic biology is breaking that mold, as MIT associate professor Michael MacDonald learned nine years ago.

In 2012, MacDonald discovered an unparalleled cluster that shines like a point source in an X-ray.

Its central galaxy hosts a predatory black hole that consumes material and emits extremely bright X-rays to drown out the diffuse radiation of the cervical medium, and in essence, the cluster forms stars at a rate about 500 times higher than most other clusters, giving it the blue glow of a young star cluster instead of the typical red color of old stars.

MacDonald says of the mass of the Phoenix: “We have been looking for a system like this for decades, however, it has been observed and overlooked over the past years, and it is assumed that it is a single galaxy instead of a group. It has been in the archive for decades and no one has seen it, and they were looking at what Behind it because it was not well marked. ”

And so, MacDonald asked, what other unusual groups might be lurking in the archives, waiting to be found? Thus, the CHiPS Survey was born.

The survey called Clusters Hiding in Plain Sight, or CHiPS for short, was conducted, which in recent years has been able to identify three new galactic groups, and one of these, CHIPS1911 + 4455, is similar to the fast-forming star-forming phoenix cluster.

This was an exciting discovery because astronomers know only a small number of phoenix-like clusters, and this group requires further study, given that it has a twisted shape with extended arms, while all the other rapidly-cooling groups are circular.

Altogether, the CHiPS survey revealed that ancient X-ray surveys missed about 1% of galactic organisms because they look different from the typical group, and this could have major implications for the quality of understanding the universe, as astronomers study galaxy clusters to learn more about how the universe is expanding and evolving.

“We need to find all the groups to fix these things,” MacDonald explains. “Ninety-nine percent of achievement is not enough if you want to push the boundaries.”

As scientists discover and study more of these unusual galaxy clusters, they may better understand how they fit into the wider cosmic picture.

And at this stage, they don’t know if a small number of clusters are always in this strange, phoenix-like state, or whether this is a typical stage that all groups go through for a short period of time, roughly 20 million years, a fleeting moment according to space-time standards. .

And it’s hard for astronomers to tell the difference, because they only get one snapshot of each frozen cluster at roughly the right time, but with more data, they can make better models of the physics that govern these galactic biology.


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