ASTRONOMERS ARE HUNTING ‘FOSSIL’ STARS FROM GALAXIES DEVOURED BY THE MILKY WAY CREDIT: HUBBLE HERITAGE TEAM (AURA/STSCI/NASA/ESA)
Ken Freeman is hunting for fossils. But he’s not looking for old bones—he’s exploring the very origin and history of our Milky Way galaxy.
Conventional theory says that our galaxy grew big by engulfing smaller ones. If this is correct, stars from the original galaxies should be still identifiable within the main mass of stars via several tell-tale signs, from unusual velocities to spectral types. These stellar fossils would point to the galaxy’s birth and growth. Continue reading Galactic archaeology— digging into the Milky Way’s past→
SUPER SCIENCE FELLOW DR JAMES ALLISON AT NARRABRI DURING AN OBSERVING RUN AT THE AUSTRALIA TELESCOPE COMPACT ARRAY. CREDIT: ANANT TANNA.
Advanced telescopes need advanced astronomers to run them. Australia is matching the millions of dollars it is investing in new telescope technology with funds to help train the rising stars of Australian astronomy.
“We’ve had big investments in infrastructure, and now we need young scientists with the expertise to use them,” says Elaine Sadler, professor of Astrophysics at the University of Sydney and chair of the National Committee for Astronomy.
One new tranche of research funding for early career astronomers comes in the form of three-year Super Science Fellowships from the Commonwealth Government. In 2011, 14 young astronomers became Super Science Fellows, joining the 17 who started work in 2010. All up, astronomy will receive one-third of the Federal Government’s $27 million commitment to the Fellowships program. Continue reading Nurturing super astronomers at home→
THE ZADKO TELESCOPE MAKING OBSERVATIONS NEAR GINGIN, 70 KILOMETRES NORTH OF PERTH. CREDIT: JOHN GOLDSMITH/CELESTIAL VISIONS.
You have to be well prepared, quick and lucky to take a picture of an explosion, especially if that explosion occurred 11 billion years ago in a remote part of the Universe. Having the right equipment, plus friends in high places, certainly helps. And that’s exactly what the Zadko Telescope—managed by the University of Western Australia at the Gingin Observatory about 70 kilometres north of Perth—does have.
In December 2008, just after it was installed, the telescope was first on the scene to record for future analysis the afterglow of a momentous event—a huge explosion as a star collapsed into a black hole releasing a massive gamma-ray burst. It’s the kind of happening the one-metre Zadko Telescope, currently the largest optical telescope in Western Australia, was built to observe. And it performed flawlessly, outpacing the world’s most powerful telescopes at the European Southern Observatory in Chile.
THE RED RECTANGLE IS A PECULIAR NEBULA WITH SOME STRANGE CHEMICAL PROPERTIES. CREDIT: NASA/ESA/ HANS VAN WINCKEL (CATHOLIC UNIVERSITY OF LEUVEN) /MARTIN COHEN (UCB).
Cracking the puzzle of unusual molecules in deep space that absorb some wavelengths of starlight is like unlocking the secrets of the Rosetta Stone, according to Rob Sharp of the Australian National University’s Research School of Astronomy and Astrophysics. “It’s the longest-standing problem in astronomical spectroscopy,” he says.
The Giant Magellan Telescope may use Australian Starbugs technology when it begins operating in around 2018. Credit: Giant Magellan Telescope—GMTO Corporation
Imagine an extremely large optical telescope fitted with detectors that can selectively collect light from a particular section of the telescope’s focal plane. Using revolutionary robotic technology called Starbugs, the detector will reconfigure itself in real time to collect from any particular area of the image, and will feed the data into any analytical instrument.
That’s exactly what Matthew Colless and his team at the Australian Astronomical Observatory have in mind with the development of MANIFEST (the many-instrument fibre system)—which make use of the special photonic technologies developed by Joss Bland-Hawthorn and his team at the University of Sydney. Continue reading Sifting sky data→
LAUNCHING THE KEPLER SPACE TELESCOPE. CREDIT: BALL AEROSPACE AND TECHNOLOGIES CORP.
Stars forming in clusters from a single galactic dust cloud are not as similar to one another as previously thought, according to an international team of astronomers who analysed ‘starquakes’ from just three months of data from NASA’s Kepler space telescope. And there is at least another four years’ data to come.
“In the past, it was assumed that the only difference [between stars in the same cluster] would be their mass,” says Dennis Stello of the University of Sydney. “But the seismology [data] tells us that might not be correct. There’s probably a spread in age or in composition because the original cloud of gas was not homogeneous.” Continue reading Starquakes reveal family secrets→
JOSS BLAND-HAWTHORN HOLDING A PHOTONIC LANTERN, A REVOLUTIONARY DEVICE TO ANALYSE THE LIGHT OF DISTANT STARS, INVENTED IN AUSTRALIA. CREDIT: CHRIS WALSH.
Using the Gemini South telescope in Chile, a team of astronomers led by Joss Bland-Hawthorn of the University of Sydney revealed the faint, outer regions of the galaxy called NGC 300, showing that the galaxy is at least twice the size as thought previously. The findings suggest that our own Milky Way galaxy could also be bigger than the textbooks say.
But Joss’s telescope observations are just a part of his contribution to astronomy. He is also helping to pioneer a new technology known as astrophotonics, which uses optical systems to improve our understanding of the Universe. Continue reading Bringing dark corners of the Universe to light→
SUSI AT NARRABRI—ONE OF THE HIGHEST SPATIAL RESOLUTION TELESCOPES USING VISIBLE LIGHT. CREDIT: GORDON ROBERTSON.
When the present upgrade is complete, the Sydney University Stellar Interferometer (SUSI) will be able to resolve objects the size of a beach ball on the Moon, says Mike Ireland of Macquarie University in Sydney. This large interferometer will be used to determine the dimensions—size, weight and velocity—of pulsating stars, hot stars, and massive stars. SUSI will also be involved in the search for binary stars and their planetary companions. Continue reading Seeing a beach ball on the moon→
A FALSE-COLOUR COMPOSITE IMAGE OF 11 FRAMES SHOWING THE 8-MONTH CIRCULAR ROTATION OF THE BINARY STAR, WOLF-RAYET 104. CREDIT: PETER TUTHILL.
It seems counterintuitive, but restricting the amount of light that reaches a telescope can sharpen up its output. The technique will be used on NASA’s successor to the Hubble Space Telescope: the James Webb Space Telescope. But it is already proving its worth here on Earth.
Images of the binary star known as Wolf-Rayet 104 (WR104), published in 2008 by Peter Tuthill of the University of Sydney, reveal the power of the new technique, which is known as aperture masking. WR104 should be difficult to see because it is in a deep cloud of dust, but Peter and his colleagues used aperture masking when observing the star with the Keck telescope in Hawai’i. The mask leads to sharper images because it cuts down complexity and makes the data easier to process and rid of error. Continue reading Keck telescope dons a mask→
On a mountaintop in northern New South Wales sits a new telescope equipped with Australia’s largest digital camera. The Australian National University’s (ANU) SkyMapper facility has been established at Siding Spring Observatory to conduct the most comprehensive optical survey yet of the southern sky.
Fully automated, the telescope is measuring the shape, brightness and spectral type of over a billion stars and galaxies, down to one million times fainter than the eye can see.
SKYMAPPER AT SIDING SPRING, NORTHERN NEW SOUTH WALES. CREDIT: AUSTRALIAN NATIONAL UNIVERSITY.
