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New Australia Telescope 'eyes' look at exploded star

Press Release From: Commonwealth Scientific and Industrial Research Organisation
Posted: Thursday, November 15, 2001

Astronomers are announcing today that they have used a new receiving system on CSIRO's Australia Telescope to make the first image at short (12-millimetre) wavelengths of Supernova 1987A, the remains of an exploded star in a nearby galaxy.

The picture marks another step in the telescope's progress to sharper eyesight.

The shorter the wavelength used to make a picture, the more detail astronomers can see.

"We've proved that the system is going to work beautifully," says CSIRO's Dr Richard Manchester.

The Australia Telescope Compact Array is a set of six radio-receiving dishes near Narrabri, NSW, that work together as one world-class radio telescope to make pictures of the sky.

Originally built to handle longer radio waves, the telescope is now being upgraded to receive wavelengths of 3 and 12 millimetres. The upgrade was funded by the first round of the Commonwealth's Major National Research Facilities program, and by CSIRO.

When the upgrade is complete the telescope will be able to see three times more detail in the supernova wreckage than it could before. Only the Hubble Space Telescope will be able to do better.

Engineers from the CSIRO Australia Telescope National Facility have been working for more than three years to improve the system.

The heart of the upgrade is a chip made of the exotic material indium phosphide, designed by CSIRO engineers and fabricated by the US company TRW.

Supernova 1987A was the brightest supernova since telescopes were invented four centuries ago. It has given astronomers vital clues about what happens when stars explode.

It can be seen only from the Southern Hemisphere. The Australia Telescope is the most advanced radio telescope in the south and has been tracking the supernova's remains since 1990, when the cloud of hot gas produced by the explosion began to glow with radio waves.

"In this new image we're seeing the effect of electrons that are moving at almost the speed of light," says Dr Bryan Gaensler of the Harvard- Smithsonian Center for Astrophysics, who made the picture with Dr Manchester. "The electrons gained these terrific speeds after being hit by the sonic boom travelling outwards from the supernova."

More information:

Dr Richard Manchester, CSIRO Australia Telescope National Facility 02-9372 4313, Dick.Manchester@csiro.au

Dr Bryan Gaensler, Harvard-Smithsonian Center for Astrophysics +1-617 496 7854, bgaensler@cfa.harvard.edu

Ms Helen Sim, CSIRO Australia Telescope National Facility 02-9372 4251, Helen.Sim@atnf.csiro.au

IMAGES

* The Australia Telescope's first view of the supernova remnant at a wavelength of 12-mm [47KB] http://www.atnf.csiro.au/~rmanches/sn1987a_12mm.gif

* Australia Telescope images of the expanding supernova remnant at a wavelength of 3 cm (in press in Publications of the Astronomical Society of Australia) [330KB] http://www.atnf.CSIRO.AU/~hsim/SN1987A_9frames.jpg

* A wide-angle Hubble Space Telescope view of the supernova remnant and its surrounds http://oposite.stsci.edu/pubinfo/pr/1999/04/pr-photos.html

* An HST image of the optical supernova ring 'lighting up' in February 2000 http://oposite.stsci.edu/pubinfo/PR/2000/11/index.html

* A 'before and after' image [470KB] of the exploding star, Supernova 1987a, from the Anglo-Australian Observatory. Image and caption details can be downloaded from: ftp://ftp.aao.gov.au/pub/local/dfm/image/1987A Please credit as follows: "Copyright (or ) Anglo-Australian Observatory" and (optionally) "Photograph by David Malin"

[NOTE: An image [11KB] of the Australia Telescope Compact Array is available at http://www.csiro.au/images/mediaReleases/atca_med.jpg]

Contacts:

Ms Rosie Schmedding
Communicator
CSIRO National Awareness
PO Box 225
Dickson ACT 2602
Phone: +61 2 6276 6520
Fax: +61 2 6276 6821
Mobile: +61 0418 622 653
Email: Rosie.Schmedding@nap.csiro.au

Ms Helen Sim
Sector Communicator
Australia Telescope National Facility
PO Box 76
Marsfield NSW 1710
Phone: +61 2 9372 4251
Fax: +61 2 9372 4310
Email: hsim@atnf.csiro.au

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