New Treasure Trove of Globular Clusters Holds Clues About Galaxy Evolution



The experiments, completed with the help of terrestrial and terrestrial astronomical observations, found the remains of previously unknown galaxies – ancient galaxies, which were simultaneously created – in the outer regions of the elliptical galaxy Centaurus A.

This work contributes greatly to the understanding of the structure and history of the galaxy and provides new insights into the formation of galaxies and the distribution of black matter throughout the universe.

Globular Groups Contains Notes For Galaxy Evolution

Allison Hughes, medical student in University of Arizona The Department of Astronomy and Steward Observatory, the first author of a peer-reviewed paper to summarize his findings, published in the Astrophysical Journal in June.

He presented the study Tuesday at a press conference of the Astronomical Society of America. When the AAS 239 human conference was canceled due to concerns about COVID-19, a press conference was held around Zoom.

Centaurus A, also known as NGC 5128, is a spectacular, circular galaxy with a jet emerging from the black hole in the center as well as spectacular streams of scattered stars abandoned by ancient collisions and combined with galaxies small circle around Centaurus A.

Located in the Centaurus constellation, 13 million light-years away from Earth, Centaurus A is so far away that it would not allow astronomers to see any star, but constellations can be identified and used as “evidence of archeology” ground cover ”of the turbulent changes of the galaxy.

Hughes and his colleagues present a booklet of about 40,000 people to globular groups in Centaurus A, further promoting results that focus on 1,900 groups that are supposed to be real globular groups.

The researchers examined members of the globular group at radius of about 150 kiloparsecs, about half a million light-years from the center of the galaxy.

The data includes observations from the following sources: Panoramic Imaging Survey of Centaurus and Sculptor, or PISCeS; Gaia, European Space Agency observatory; and the NOAO Source Catalog, which integrates publicly available images from telescopes into both sections that cover almost the entire sky.

Centaurus A has become a leading target for extragalactic globular group studies due to its size and proximity to Earth, but most studies have focused on within 40 kiloparsecs (approximately 130,500 light years) of the galaxy, Hughes explained, leaving. The arrival of the galaxy is often unknown.

By classifying the nominees based on the likelihood that they are real global groups, the group found that approximately 1,900 are probable and thus should be at the forefront of subsequent verification.

“We are using the Gaia satellite, which focuses mainly on exploring the interior of our Milky Way galaxy, in a new way in conjunction with the telescopes below, in this case, the Magellan Clay telescope in Chile. And the Anglo-Australian Telescope in Australia. ”

The design of Centaurus A tells astronomers that it has passed through a number of intersecting galaxies, which, in turn, have made it look like rivers that have more stars than the surrounding planets, Hughes said.

By providing the closest example of an elliptical galaxy, Centaurus A gives astronomers the opportunity to study near the galaxy, which is far different from ours.

The Milky Way, as well as its closest neighbor, Andromeda Galaxy, are all orbiting galaxies. With their well-known shape, like a pinwheel, orbiting galaxies may look like galaxies, but their seemingly unconventional cousins ​​outnumber the galaxy.

“Centaurus A may seem strange, but it’s because we can get so close to seeing more,” Hughes said. “There is no doubt that galaxies in orbit around the Milky Way galaxy are much more abstract than we might think if we look at them from a deeper perspective.”

Globular cores are evidence of ancient mechanisms, Hughes said.

“For example, if you look at a line of these globular bands that all have the same chemical composition and are moving at the same speed of light, we know that they must have originated from the same small galaxy or similar object that collided with Centaurus. And now they are on the same path. “

Constellations are formed from frozen clusters of gas in the galaxy. Nearly every galaxy has a cluster of galaxies, including the Milky Way, which boasts about 150 of them, but most stars are not classified as such.

In studying globular groups, astronomers is able to gather information about the galaxy you live in, such as its size, its history of contact with nearby galaxies and the distribution of black matter inside, according to Hughes.

“Globular galaxies are spectacular because they can be used as a guide for the design and structure of other galaxies where we cannot eliminate astronomy,” Hughes said. “They use a medical signature, just as their stars are made, so they tell us nothing about the place they made it.”

The researchers looked specifically at all galaxies far from the center of the galaxy because the Centaurus A section shows the number of such galaxies that have not been found, Hughes said.

Previous findings of less than 600 clusters in the central region, but the outer regions of the galaxy are still unknown.

“We looked a lot further and found more than 100 new teams, and there are probably more because we did not complete the analysis,” Hughes said.

“We can use the same to improve the structure and movement of the galaxy, as well as determine its size. From there, we can remove all its stars and see what remains – the invisible mass must be its black object.”




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