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A supernova remnant continues to reveal it secrets

A team of astronomers uses a telescope in Australia to make the highest-resolution radio images of the expanding object at millimeter wavelengths.

Supernova photo
Observations performed with the Australia Telescope Compact Array produced this radio image, at wavelength 7mm, of the remnant of Supernova 1987A. // ICRAR
A team of astronomers led by the International Centre for Radio Astronomy Research (ICRAR) has succeeded in observing the death throes of a giant star in unprecedented detail.

In February 1987, astronomers observing the Large Magellanic Cloud, a nearby dwarf galaxy, noticed the sudden appearance of what looked like a new star. In fact, they weren’t watching the beginnings of a star but the end of one--and the brightest supernova seen from Earth in the four centuries since the telescope was invented. By the next morning, news of the discovery had spread around the globe and Southern Hemisphere stargazers began watching the aftermath of the enormous stellar explosion, known as a supernova.

In the two and a half decades since then, the remnant of Supernova 1987A has continued to be a focus for researchers the world over, providing a wealth of information about one of the universe’s most extreme events.

In research published Monday in the Astrophysical Journal, a team of astronomers in Australia and Hong Kong has succeeded in using the Australia Telescope Compact Array, a CSIRO radio telescope in New South Wales, to make the highest-resolution radio images of the expanding supernova remnant at millimeter wavelengths. (CSIRO, Australia’s national science agency, stands for the Commonwealth Scientific and Industrial Research Organisation.)

“Imaging distant astronomical objects like this at wavelengths less than 1 centimeter demands the most stable atmospheric conditions,” said lead author, Dr. Giovanna Zanardo, of ICRAR. “For this telescope, these are usually only possible during cooler winter conditions but even then, the humidity and low elevation of the site makes things very challenging.” (ICRAR is a joint venture of Curtin University and The University of Western Australia in Perth.)

Unlike optical telescopes, a radio telescope can operate in the daytime and peer through gas and dust, allowing astronomers to see the inner workings of objects like supernova remnants, radio galaxies, and black holes.

“Supernova remnants are like natural particle accelerators; the radio emission we observe comes from electrons spiraling along the magnetic field lines and emitting photons every time they turn. The higher the resolution of the images, the more we can learn about the structure of this object,” said Professor Lister Staveley-Smith, deputy director of ICRAR and CAASTRO (the ARC Centre of Excellence for All-Sky Astrophysics).

Scientists study the evolution of supernovae into supernova remnants to gain an insight into the dynamics of these massive explosions and the interaction of the blast wave with the surrounding medium.

“Not only have we been able to analyze the morphology of Supernova 1987A through our high-resolution imaging, we have compared it to X-ray and optical data in order to model its likely history,” said Professor Bryan Gaensler, director of CAASTRO at the University of Sydney.

The team suspects that a compact source or pulsar wind nebula is sitting in the center of the radio emission, implying that the supernova explosion did not make the star collapse into a black hole. The researchers will now attempt to observe further into the core and see what’s there.
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