The energy of ultra-high energy (UHE) cosmic rays that strike the Earth’s atmosphere make the energy produced from particle collisions by the Large Hadron Collider look puny. A team based in South Australia is now developing the techniques and technology to find out where such energetic particles could possibly originate. They ultimately hope to use the proposed SKA telescope to conduct their search.
“We think some cosmic rays are produced in the remnants of supernovae—exploding stars—but where the most energetic ones come from, that’s a mystery,” says Justin Bray, a PhD student hunting for their source as part of the LUNASKA (Lunar Ultra-high-energy Neutrino Astrophysics using SKA) project led by Ray Protheroe at the University of Adelaide and Ron Ekers at CSIRO. Continue reading Tracing cosmic rays from radio pulses→
Over aeons of time cosmic gas comes together, stars begin to form, supernovae explode, galaxies collide. And computational astronomers can watch it all unfold inside a supercomputer. That’s the kind of work post-doctoral fellows Rob Crain and Greg Poole are doing at the Swinburne Centre for Astrophysics and Supercomputing. Continue reading Supercomputers bring theory to life→
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→
University of Queensland / University of Copenhagen
In 1998 astronomers made an astonishing discovery-the expansion of the Universe is not happening at a steady rate, nor is it slowing down toward eventual collapse. Instead, it is accelerating. The discovery required a complete rethink of the standard model used to explain how the Universe works.
“Now we know that stars, planets, galaxies and all that we can see make up just four per cent of the Universe,” says Tamara Davis, a University of Queensland astrophysicist.
“About 23 per cent is dark matter. The balance is thought to be dark energy, which we know very little about.”