Remote Antarctic telescope reveals gas cloud where stars are born

February 20, 2014
A UNSW-led team has used a telescope in Antarctica to identify a giant gas cloud in our galaxy which appears to be in an early stage of formation. Image is of the PLATO-R observatory at Ridge A. The HEAT telescope is the black object on stilts at left, the instrument module is the yellow box and the solar panel array is on the right. Credit: Geoff Sims

Using a telescope installed at the driest place on earth - Ridge A in Antarctica – a UNSW-led team of researchers has identified a giant gas cloud which appears to be in an early stage of formation.

Giant of molecular gas – the most massive objects in our galaxy – are the birthplaces of stars.

"This newly discovered is shaped like a very long filament, about 200 light years in extent and ten light years across, with a mass about 50,000 times that of our sun," says team leader, Professor Michael Burton, an astronomer at UNSW Australia.

"The evidence suggests it is in the early stages of formation, before any stars have turned on."

The results are published in The Astrophysical Journal.

The team is using the High Elevation Antarctic Terahertz , or HEAT, at Ridge A, along with the Mopra telescope at Coonabarabran in NSW, to map the location of gas clouds in our galaxy from the carbon they contain.

At 4000 metres elevation, Ridge A is one of the coldest places on the planet, and the driest. The lack of water vapour in the atmosphere there allows terahertz radiation from space to reach the ground and be detected.

The PLATO-R robotic observatory with the HEAT telescope was installed in 2012 by a team led by UNSW physicist, Professor Michael Ashley, and Dr Craig Kulesa of the University of Arizona.

A UNSW-led team has used a telescope in Antarctica to identify a giant gas cloud in our galaxy which appears to be in an early stage of formation. Image is of the HEAT telescope at Ridge A. Credit: Geoff Sims

"We now have an autonomous telescope observing our galaxy from the middle of Antarctica and getting data, which is a stunning new way of doing science. Ridge A is more than 900 kilometres from the nearest people, who are at the South Pole, and is completely unattended for most of the year," says Professor Burton.

The HEAT telescope detects atomic carbon and the Mopra telescope detects carbon monoxide. "I call it following the galactic carbon trail," says Professor Burton.

The discovery of the new galactic cloud, which is about 15,000 from earth, will help determine how these mysterious objects develop in the interstellar medium.

One theory is that they are formed from the gravitational collapse of an ensemble of small clouds into a larger one. Another involves the random collision of small clouds that then agglomerate. Or it may be that the filament is condensing out of a very large, surrounding cloud of atomic gas.

About one star per year, on average, is formed in the Milky Way. Stars that explode and die then replenish the gas clouds as well as moving the about and mixing it up.

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