“Warped & Twisted” –First 3D Map Unveils Milky Way’s Real Shape

Milky Way's Shape

 

There are several hundred billion stars in our Milky Way Galaxy. At a conservative estimate, several billion of them are orbited by planets capable of supporting life. There may be more habitable planets in the Galaxy than there are people on planet Earth. But our human eyes are hopelessly inadequate for revealing the true nature of the Galaxy.

An international team of astronomers have discovered that the Milky Way’s disc of stars becomes increasingly ‘warped’ and twisted the further away the stars are from the galaxy’s center. “We usually think of spiral galaxies as being quite flat, like Andromeda which you can easily see through a telescope,” says Professor Richard de Grijs, a co-author and astronomer from Australia’s Macquarie University.

The first accurate 3D map of our galaxy reveals its true shape: warped and twisted. Astronomers from Macquarie University and the Chinese Academy of Sciences have used 1339 ‘standard’ stars to map the real shape of our home galaxy in a paper published in Nature Astronomy today.¬†Artist’s impression above of the warped and twisted Milky Way disk. (Chen Xiaodian)

Trying to determine the real shape of our galaxy is like standing in a Sydney garden and trying to determine the shape of Australia. But, for the past 50 years there have been indications that the hydrogen clouds in the Milky Way are warped. The new map shows that the warped Milky Way disc also contains young stars. It confirms that the warped spiral pattern is caused by torque from the spinning of the Milky Way’s massive inner disc of stars.

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“It is notoriously difficult to determine distances from the Sun to parts of the Milky Way’s outer gas disc without having a clear idea of what that disc actually looks like,” says Xiaodian Chen, lead author, from the Chinese Academy of Sciences in Beijing.

“This research provides a crucial updated map for studies of our galaxy’s stellar motions and the origins of the Milky Way’s disk,” says Licai Deng, senior researcher at the Chinese Academy of Sciences and co-author on the paper.

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The team built their map using 1339 large pulsating stars each up to 100,000 brighter than our sun. Data on these classical Cepheid stars were provided by the Wide-field Infrared Survey Explorer (WISE).

Astronomers have observed a dozen other galaxies which showed similar progressively twisted spiral patterns in their outer regions. So our Milky Way’s twists are rare but not unique.

The Daily Galaxy via Science in Public