"Essentially different objects have different 'radio colors' so we can use them to determine what kind of physics is playing."
Using the images, Dr. Hurley-Walker and her colleagues found the remains of 27 massive stars that burst into 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 remnants of supernovae, or those in very dense environments, are easily discernible, and 295 are already known. Unlike other instruments, MWA can find those that are older, farther away or in many empty environments.
p. Hurley-Walker said that one of the newly discovered supernova remnants is in such an empty space, far from the plane of our galaxy, and therefore, although quite young, it is also very weak. "It's the remains of a star that died less than 9,000 years ago, which means the explosion could have been visible to Australia's indigenous population at that time," she says. The University of Melbourne has said that some Aboriginal traditions describe bright new stars appearing in the sky, but we do not know what definitive traditions describe this particular event. "However, now that we know when and where this supernova appeared in heaven, we can work with the Native Elders to see if any of their traditions describe this cosmic event. If there is one, it would be extremely exciting," he said.  Dr. Hurley-Walker said that two of the discovered supernova remnants are rather unusual "orphans" found in a celestial region where there are no massive stars, meaning that future searches in other such regions may be more successful than astronomers expect. Other supernova remnants found in the study are very old, she said. "It's really exciting for us because it's hard to find the remnants of supernovae in this phase of life – they allow us to look back in time along the Milky Way."
The MWA telescope is a harbinger of the world's largest radio telescope , the square kilometer array to be built in Australia and South Africa by 2021. "MWA is ideal for finding these sites, but is limited in sensitivity and resolution," said Dr. Hurley-Walker. "The low-frequency portion of the SKA, which will be built on the same site as the MWA, will be thousands of times more sensitive and have a much better resolution, so you have to find the thousands of supernova remnants that have formed over the last 100 000 years, even on the other side of the Milky Way. "
Australian Desert Telescope looks at the sky in radio engineering
"New Remains of Radio-Candidates Found in GLEAM Survey Over 345 ° www.icrar.org/wp-content/uploa… etected_in_GLEAM.pdf
'Remnants of radio-candidate candidates observed by the GLEAM study at 345 ° www.icrar.org/wp-content/uploa… /gleam-survey-ii.pdf records19659005Sense & # 39; GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) Study II: Galactic Plane 345 ° www.icrar.org/wp-content/uploa… erved_by_GLEAM-1.pdf
International Center for Radio Astronomy Research
The outer telescope takes over the center of the Milky Way, reveals remains of dead stars (2019, November 20)
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