Sunday , May 16 2021

Research: Accurate, accurate 3D maps of the Milky Way reveal a twisted galaxy –



Our Milky Way galaxy stars are very stable and flat stars. Astronomers at Macquarie University and the China Academy of Sciences have built and published accurate 3D maps of the Earth's galaxy for the first time today. Published Natural Astronomy.

According to astronomers at Macquarie University and the China Academy of Sciences, they built the first accurate 3D map of the Earth's home galaxy and published it in today's paper. Natural Astronomy.

From a long distance, our galaxy will look like a thin, star-shaped star that orbits once every hundred million years, centered in the central region. Hundreds of millions of stars provide a gravity & # 39; full & # 39; to bind them together.

But the pull of gravity is far from the inner area of ​​the Milky Way. Hydrogen atoms, which make up the bulk of the galaxy's gas disk, are no longer confined to a thin plane, but give the disk a twisted look like S, in far-off discs of the galaxy.

Xiaodian Chen, a researcher at the Chinese Academy of Sciences in Beijing, said, "It is very difficult to determine the distance from the sun to a portion of the outer gas disk of the Milky Way. Natural Astronomy.

"Recently, however, we have released a new catalog of working variables that can determine the exact distance of the 3-five known as classic Cepheids." This database allows the team to develop the first accurate three- Let us send our Milky Way to a distant outside area.

The classic cepheids are young stars that are four to 20 times brighter than our sun and 100,000 times larger than our sun. Such high-stellar masses imply that they live fast, dying in youth, burning nuclear fuel very quickly, sometimes only in millions of years.

They are observed as a change in brightness with a long pulse per day, monthly. Combined with the observed brightness of Cepheids, you can achieve very reliable distances using the pulse cycle.

Surprisingly, we have found that 1339 Cepheid stars and Milky Way gas discs are closely connected to each other in 3D. This provides new insights into the formation of our galaxy. "Says Professor Richard de Grijs, an astronomer and chief co-author of Macquarie University.

"Perhaps more importantly, we found that star-shaped discs like the S in the outskirts of the Milky Way were twisted into a progressively twisted spiral pattern."

This reminded the team of several other galaxy observations at the beginning, and also showed the gradual twist of the Milky Way.

The researchers concluded that combining the new results with other observations could result in a twisted spiral pattern of the Milky Way due to "torques" or rotation forcing by huge internal discs.

"This new morphology provides an important map for the study of the origin of the galaxy's stars and galaxy discs," says Licai Deng, senior researcher and co-author of the Chinese Academy of Sciences.


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