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Old 21-11-2019, 12:11 AM
gary
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Murchison Widefield Array discovers 24 new SNR in the Galactic Centre

The International Centre for Radio Astronomy Research (ICRAR) was
founded in September 2009 with the specific purpose of supporting
Australia’s bid to host the SKA.

It is a joint venture between Curtin University and The University of
Western Australia and now plays a role in the SKA's development.

In a press release today, ICAR report how using data from the
Murchison Widefield Array (MWA) telescope that was processed by
Pawsey Supercomputing Centre in Perth has resulted in a new view
of the galactic centre of the Milky Way.

Quote:
Originally Posted by ICAR
The data for the research comes from the GaLactic and Extragalactic All-sky MWA survey, or ‘GLEAM’ for short.

The survey has a resolution of two arcminutes (about the same as the human eye) and maps the sky using radio waves at frequencies between 72 and 231 MHz (FM radio is near 100 MHz).

“It’s the power of this wide frequency range that makes it possible for us to disentangle different overlapping objects as we look toward the complexity of the Galactic Centre,” Dr Hurley-Walker said.

“Essentially, different objects have different ‘radio colours’, so we can use them to work out what kind of physics is at play.”

Using the images, Dr Hurley-Walker and her colleagues discovered the remnants of 27 massive stars that exploded in supernovae at the end of their lives.

These stars would have been eight or more times more massive than our Sun before their dramatic destruction thousands of years ago.
Younger and closer supernova remnants, or those in very dense environments, are easy to spot, and 295 are already known.

Unlike other instruments, the MWA can find those which are older, further away, or in very empty environments.

Dr Hurley-Walker said one of the newly-discovered supernova remnants lies in such an empty region of space, far out of the plane of our galaxy, and so despite being quite young, is also very faint.

“It’s the remains of a star that died less than 9,000 years ago, meaning the explosion could have been visible to Indigenous people across Australia at that time,” she said.
Quote:
Originally Posted by ICAR
Dr Hurley-Walker said two of the supernova remnants discovered are quite unusual “orphans”, found in a region of sky where there are no massive stars, which means future searches across other such regions might be more successful than astronomers expected.

Other supernova remnants discovered in the research are very old, she said.

“This is really exciting for us, because it’s hard to find supernova remnants in this phase of life—they allow us to look further back in time in the Milky Way.”

The MWA telescope is a precursor to the world’s largest radio telescope, the Square Kilometre Array, which is due to be built in Australia and South Africa from 2021.

“The MWA is perfect for finding these objects, but it is limited in its sensitivity and resolution,” Dr Hurley-Walker said.

“The low-frequency part of the SKA, which will be built at the same site as the MWA, will be thousands of times more sensitive and have much better resolution, so should find the thousands of supernova remnants that formed in the last 100,000 years, even on the other side of the Milky Way.”
Full press release, images, video here :-

https://www.icrar.org/gleam2019/

Milky Way image viewer (select GLEAM (Radio) :-

http://gleamoscope.icrar.org/gleamoscope/trunk/src/


Papers :-

‘New candidate radio supernova remnants detected in the GLEAM survey over 345° < l < 60°, 180° < l < 240°’,
published in Publications of the Astronomical Society of Australia (PASA) on November 20th, 2019.
https://www.icrar.org/wp-content/upl...d_in_GLEAM.pdf

‘Candidate radio supernova remnants observed by the GLEAM survey over 345° < l < 60°, 180° < l < 240°’,
published in Publications of the Astronomical Society of Australia (PASA) on November 20th, 2019.
https://www.icrar.org/wp-content/upl...-survey-ii.pdf

‘GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey II: Galactic Plane 345° < l < 67°, 180° < l < 240°’,
published in Publications of the Astronomical Society of Australia (PASA) on November 20th, 2019.
https://www.icrar.org/wp-content/upl...by_GLEAM-1.pdf
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