February 21, 2014
Remote Antarctic Telescope Reveals Gas Cloud Where Stars Are Born
Deborah Smith, University of New South Wales
"This newly discovered gas cloud 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 telescope, 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 meters elevation, Ridge A is one of the coldest places on the planet, and the driest. The lack of water vapor in the atmosphere there allows terahertz radiation from space to reach the ground and be detected.
"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 kilometers 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 light years 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 molecular gas 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 gas about and mixing it up.