New study finds Milky Way warped, twisted

New Age Online | Published: 10:57, Aug 02,2019 | Updated: 10:58, Aug 02,2019

 
 

Visualisation of the warped and twisted Milky Way. — BBC photo

A team of Warsaw University astronomers has said that our galaxy, the Milky Way, is ‘warped and twisted’ and not flat as previously thought, new research shows.

Dr Dorota Skowron and her team measured the distances of some of the brightest stars in the Milky Way, called Cepheid variable stars to gain a more accurate picture.

These are massive young stars that burn hundreds, if not thousands, of times brighter than our own Sun. They can be so bright that they can be observed at the very edge of the galaxy.

Analysis of these stars in the galaxy shows that they do not lie on a flat plane as shown in academic texts and popular science books.

The Warsaw University team speculated that it might have been bent out of shape by past interactions with nearby galaxies.

The new three dimensional map has been published in the journal Science, reports British Broadcasting Corporation.

The popular picture of the Milky Way as the flat disc is based on the observation of 2.5 million stars out of a possible 2.5 billion. The artists’ impressions are therefore rough approximations of the truer shape of our galaxy, according to Dorota Skowron.

‘The internal structure and history of the Milky Way is still far from being understood, in part because it is extremely difficult to measure distances to stars at the outer regions of our galaxy,’ she said.

Not only that, they also pulsate at regular intervals at a rate that is directly related to their brightness.

This enables astronomers to calculate their distance with great precision.

Most of the stars were identified by the Optical Gravitational Lensing Experiment at Las Campanas Observatory in Chile’s southern Atacama Desert. Przemek Mroz, a member of the OGLE team, said that the results were surprising.

‘Our results show that the Milky Way Galaxy is not flat. It is warped and twisted far away from the galactic centre. Warping may have happened through past interactions with satellite galaxies, intergalactic gas or dark matter— invisible material present in galaxies about which little in known.’

The Polish results support an analysis of Cepheid variable stars published in February in Nature Astronomy journal by astronomers from Macquarie University in Australia and the Chinese Academy of Sciences.

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