Saturday , February 23 2019
Home / canada / We live in a "deformed and distorted" galaxy according to the first accurate 3D map of the Milky Way

We live in a "deformed and distorted" galaxy according to the first accurate 3D map of the Milky Way




<div _ngcontent-c14 = "" innerhtml = "

The artist's impression of the distorted and twisted disc with the Milky Way.Chen Xiaodian

How & nbsp; do you measure something from & nbsp; in? We have all seen countless images of our own Milky Way, but you have ever considered this: none of them is real. All are artists' impressions of what astronomers believe the Milky Way is likely to be.

We now know that the Milky Way is not flat. Astronomers from the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC) and Macquarie University in Sydney, Australia published a book in Nature Astronomy This reveals the Milky Way to be "distorted, distorted and burned" away from the center of the Milky Way.

"We usually think spiral galaxies are quite flat, like Andromeda, which you can easily see through a telescope," says Professor Richard de Grees, co-author and astronomer at Macquarie University.

Galaxy Andromeda or M31.Getty

How does the Milky Way work?

When viewed from a long distance, the Milky Way galaxy will look like a thin disk of stars that circle once a few hundred million years around its central area. The expected 300 billion stars, along with a mass of dark matter, provide the gravitational "glue" to keep it together, astronomers say.

What causes the S-shaped base?

What is distorted are hydrogen clouds in the outer galaxy. This is the change in attracting gravity away from the inner galaxy area that causes the S-shaped base of the Milky Way. "It is known that it is difficult to determine the distances from the Sun to parts of the Milky Way external gas disk without having a clear idea of ​​what this disk looks like." & Nbsp; said Dr. Chen Xiaodian, NAOC researcher and lead author of the article. "However, we have recently published a new catalog of well-behaved variable stars, known as classic cefeids, for which distances with an accuracy of 3 to 5% can be determined."

RS Puppis is one of the brightest known Cepheid variable stars in the Milky Way Galaxy.Hubble Space Telescope

What is a star from Cepheid?

Yellow light giant and super-giant stars. Chefed stars are often referred to as "cosmic criteria" orstandard candles"And much of what astronomers know about the distances in the universe is reduced to the observations of these young pulsing stars. The study examined 1339 cepheids, each of which was up to 100,000 brighter than the Sun.

Why Cepheid stars important?

Cepheids pulsate predictably so that changes in their light can be used to produce a a very reliable distanceThe team uses "classic" cepheids that pulse for days or months. Cepheids were first discovered in 1912 by Henrietta Swan Levitt at the Harvard College Observatory after exploring thousands of stars in the Magellanic Clouds, two dwarf galaxies circling the Milky Way. Her work was used by Edwin Hubble to determine that some nebulae that could be seen on Earth were in fact distant galaxies. The data was then used to calculate that the farther the galaxy is, the faster it is moving away from us: Hubble's constant, which describes expanding the universe,

For astronomers in China and Australia, data on these classic cephid stars were provided by Broad Field Infrared Studies (WISE), which allows the team to develop the first accurate three-dimensional picture of our Milky Way to its distant outlying areas.

The WISE Infrared Investigator, launched in 2009, WISE scans the entire sky in infrared light, capturing the glow of hundreds of millions of objects and producing millions of images.NASA

Why does this matter?

"Somewhat to our surprise we found that our 3D collection of 1339 Cepheid stars and the Milky Way gas disc follows one another, offering new insights into the formation of our home galaxy," & nbsp;said by Grijs. "Maybe the more important thing is that in the outer regions of the Milky Way we have found that S-like star disk is distorted in a progressively twisted spiral."

"This new morphology provides a crucial, up-to-date map for exploring the stellar motion of our galaxy and the origin of the Milky Way disk," & nbsp;said Dr. Deng Lichai, senior NAOC researcher and co-author of the article.

What causes the base?

Over the last 50 years there have been signs that the hydrogen clouds in the Milky Way are distorted. Astronomers have seen a dozen other galaxies that show similar progressive spiral patterns in their outer regions. "By combining our findings with these other observations, we came to the conclusion that the curved spiral pattern of the Milky Way is most likely caused by" torques "or rotating forcing from the massive internal disk," & nbsp; said Dr. Liu Chao, senior researcher and co-author of the article.

I wish you a clear sky and wide eyes

If you like this article, you may also like these:

Texas claims the Third Dark Sanctuary in the United States as the fight against light pollution continues

The galaxy will burst into the dairy road, wake up the black hole and send the solar system "to fly into space"

The Missing Link mysterious object was found on the brink of the solar system by scientists using small telescopes

When is the next 'super blood moon moon? How to see another lunar eclipse before you die

">

The artist's impression of the distorted and twisted disc with the Milky Way.Chen Xiaodian

How do you measure something you are? We have all seen countless images of our own Milky Way, but you have ever considered this: none of them is real. All are artists' impressions of what astronomers believe the Milky Way is likely to be.

We now know that the Milky Way is not flat. Astronomers from the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC) and Macquarie University in Sydney, Australia, have just published a report in Nature Astronomy This reveals the Milky Way to be "distorted, distorted and burned" away from the center of the Milky Way.

"We usually think spiral galaxies are quite flat, like Andromeda, which you can easily see through a telescope," says Professor Richard de Grees, co-author and astronomer at Macquarie University.

Galaxy Andromeda or M31.Getty

How does the Milky Way work?

When viewed from a long distance, the Milky Way galaxy will look like a thin disk of stars that circle once a few hundred million years around its central area. The expected 300 billion stars, along with a mass of dark matter, provide the gravitational "glue" to keep it together, astronomers say.

What causes the S-shaped base?

What is distorted are hydrogen clouds in the outer galaxy. This is the change in attracting gravity away from the inner galaxy area that causes the S-shaped base of the Milky Way. "It is known that it is difficult to determine the distance from the sun to parts of the Milky Way external gas disk without having a clear idea of ​​what this disk is," said Dr. Chen Xiaodian, NAOC researcher and lead author of the article. , "However, we have recently published a new catalog of well-managed variable stars, known as classic cefeids, for which distances with an accuracy of 3 to 5% can be determined."

RS Puppis is one of the brightest known Cepheid variable stars in the Milky Way Galaxy.Hubble Space Telescope

What is a star from Cepheid?

Yellow light giant and super-giant stars. Chefed stars are often called "cosmic criteria" or "standard candles", and much of what astronomers know about the distances in the universe is limited to observations of these young pulsing stars. The study examined 1339 cepheids, each of which was up to 100,000 brighter than the Sun.

Why Cepheid stars important?

Cepheids pulsate in a predictable way so that changes in their light can be used to obtain a highly reliable distance. The team uses "classic" cefeids that pulse for days or months. Cepheids were first discovered in 1912 by Henrietta Swan Levitt at the Harvard College Observatory after exploring thousands of stars in the Magellan clouds, two dwarfs circling the Milky Way. Her work was used by Edwin Hubble to determine that some nebulae that could be seen on Earth were in fact distant galaxies. The data was then used to calculate that the farther the galaxy is, the faster it moves away from us: the Hubble constant, which describes the expanding universe.

For astronomers in China and Australia, the data for these classic Cepheid stars is provided by WISE, which allows the team to develop the first accurate 3D image of our Milky Way to its distant outer regions. ,

The WISE Infrared Investigator, launched in 2009, WISE scans the entire sky in infrared light, captures the light of hundreds of millions of objects and produces millions of images.NASA

Why does this matter?

"Somewhat to our surprise, we discovered that in our 3D Cepheid 1339 stars collection and the Milky Way gas track are closely monitored, and this brings new insights into the formation of our home galaxy." said by Grijs. "Perhaps more importantly, in the outer regions of the Milky Way, we found that the star S-disk was distorted in a progressively twisted spiral.

"This new morphology provides a crucial updated map for exploring the stellar movement of our galaxy and the origin of the Milky Way disk" said Dr. Deng Lichai, senior NAOC researcher and co-author of the article.

What causes the base?

Over the last 50 years there have been signs that the hydrogen clouds in the Milky Way are distorted. Astronomers have seen a dozen other galaxies that show similar progressive spiral patterns in their outer regions. "By combining our findings with these other observations, we came to the conclusion that the twisted spiral pattern of the Milky Way is most likely caused by" torque "or rotational pressure from the massive internal disk," said Dr. Liu Chao, senior researcher and co-author of the paper.

I wish you a clear sky and wide eyes

If you like this article, you may also like these:

Texas claims the Third Dark Sanctuary in the United States as the fight against light pollution continues

The galaxy will burst into the dairy road, wake up the black hole and send the solar system "to fly into space"

The Missing Link mysterious object was found on the brink of the solar system by scientists using small telescopes

When is the next 'super blood moon moon? How to see another lunar eclipse before you die


Source link