Monday , January 25 2021

We Discover Not The Milky Way Not Ending Flat Disk After All



Our galaxy really likes boogie. He has, on many occasions, enjoyed Mash Monster; He was now caught making the Twist. A new study has revealed that the Milky Route is not a nice, tidy, flat disk – there is a war around the edges.

We often compare our home galaxy to neighbor next, Andromeda. Andromeda (probably) is more than the Milky Way, but the two galaxies are quite big, both are sparkling galaxies, both of which are around & # 39; one old.

As we live inside the Milky Way, we can not observe its full shape – that would be like sitting in a submarine and trying to calculate the dimensions of the sea . However, given what we know about galaxies in general, so far, it was sensible to think that the Milky Way could look very similar to Andromeda, with urgent arms organized.

Astrophysics have now discovered that the further travels from the galactic center, the more war and sewage design in which the Llaethog Road discovers. Its galactic plane is not a straight line; Instead, it looks a bit more like a slippery S.

The discovery all thanks to some new distance measurements to stars in the outer regions of the galaxy.

"It's incredibly difficult to determine Sun distances to parts of the external gas disk of the Llaethog Road without having a clear idea of ​​what a disk really see," he said Chen Xiaodian astronomer of the National Astronomical Observatory of the Chinese Academy of Sciences (NAOC).

One way is to use a type of star of the name of the Cepheid variable. These are very bright stars that highlight a specific frequency, which allows servers to calculate their total size. In turn, this allows the distances to be calculated for those stars.

In the optical spectrum, dust and gas between us and the star can find a true decision of brightness, which means there is little uncertainty in the subsequent distance calculations.

But the infrared radiation can penetrate the dust, which makes a more accurate result – so here is what the scientists use.

"We used a new catalog of infrared observations obtained with WISE space observatory to reduce the effects of dust and determine Distances to Cepheids with uncertainty of less than 3 to 5 percent – that is unprecedented accuracy so far , "astrophysicist Richard de Grijs from the University of Macquarie in Australia at Science Alert.

"In conjunction with our prominent airfields, we built a three-dimensional map of the Milky Way as traced by these Cepheids, which we compare with the gas distribution.

"Both seemed to divert from flat disk."

It does not indicate that it is unusual for sparkling galaxy to be marginalized around the edges, especially the atomic hydrogen gas that extends beyond the disceller. What makes the way of the Milky Way so interesting is that it includes stars – and young people to start.

But, said de Grijs, it's even more interesting that the Lilac Way disc is turned, or predicted.

"It appears that the prediction of the disk suggests that the huge internal disk of the Milky Way might force the external disk to follow its rotation, but the external disk rotation tended – cause turning, "he said.

"This has not been seen for the Milky Way, but [retired astronomer] Frank Briggs had found this many years ago for a dozen large spiral galaxies in the nearby Universe. Combining its results and its results, we believe that the same dynamics play in the Milky Way. "

It is a result that gives us a better understanding of the three-dimensional structure and dynamics of our galaxy, and will allow us to set an upper limit on the size and distribution of the disease issue – which will be "special Interesting in the context of the question where the dark issue has locked, "says de Grijs.

It will also help us to understand the relationships and interactions of a Satellite Path with specific satellite galaxies, specifically the Magellanic Clouds, and the history of our local (pervasive) space pocket.

The team's research has published in the magazine Astronomy of Nature.


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