قالب وردپرس درنا توس
Home / Science / The Outback telescope captures the center of the Milky Way and discovers remains of dead stars

The Outback telescope captures the center of the Milky Way and discovers remains of dead stars



  The Outback telescope captures the center of the Milky Way and discovers remains of dead stars.
A new view of the Milky Way from the Murchison Widefield Array with the lowest frequencies in red, the middle frequencies in green and the highest frequencies in blue. Huge golden filaments indicate enormous magnetic fields, supernova remnants are visible as small spherical bubbles, and regions of massive star formation appear blue. [The supermassive black hole at the centre of our galaxy is hidden in the bright white region in the centre.] Picture credits: Dr. med. Natasha Hurley-Walker (ICRAR / Curtin) and the GLEAM team

A radio telescope in the Western Australian Outback has taken a spectacular new view of the center of the galaxy galaxy. The image from the Murchison Widefield Array (MWA) telescope shows what our galaxy would look like if human eyes could see radio waves.

The astrophysicist dr. Natasha Hurley-Walker from the Curtin University node of the International Center for Radio Astronomy Research (ICRAR) created the images with the Pawsey Supercomputing Center in Perth. "This new view captures our galaxy's low-frequency radio emission, looking at both detailed and larger structures," she said. "Our pictures look directly into the middle of the Milky Way, towards a region that astronomers call the galactic center."

Data for the research are from the GaLactic and Extragalactic All-Sky MWA Survey, GLEAM for short. The survey has a resolution of two arc minutes (approximately the same as the human eye) and maps the sky with radio waves at frequencies between 72 and 231 MHz (FM radio is near 100 MHz).

"This is the strength of this broad frequency range, which allows us to unravel various overlapping objects while looking at the complexity of the galactic center," Dr. Hurley-Walker] The 27 newly discovered supernova remnants – the remnants of stars that died thousands to hundreds of thousands of years ago in massive stellar explosions. The radio images trace the edges of the explosions as they continue to expand into the interstellar space. [Some are huge, larger than the full moon, and others are small and hard to spot in the complexity of the Milky Way.] Picture credits: Dr. med. Natasha Hurley-Walker (ICRAR / Curtin) and the GLEAM team.

"In essence, different objects have different & # 39; radio colors & # 39 ;, so we can use it to figure out what kind of physics is involved."

Dr. Hurley-Walker and her colleagues used the images to discover the remains of 27 massive stars that exploded into supernovae at the end of their lives. These stars would have been eight times as massive as our sun before their dramatic destruction thousands of years ago.

Younger and denser remnants of supernova or those in very dense environments are easily recognized, and 295 are already known. Unlike other instruments, MWA can find older, more distant or very empty environments.

  The Outback telescope captures the center of the Milky Way and discovers remains of dead stars.
This 28-frame photo mosaic captures the arc of the Milky Way across the Guilderton lighthouse in Western Australia and the large and small Magellanic Clouds. The position of a supernova that exploded 9,000 years ago and would have been visible in the night sky is shown in the picture. Picture credits: Paean Ng / Astrordinary Imaging

Dr. Hurley-Walker said that one of the newly discovered supernova remnants lies in such an empty region of space, far beyond our galaxy's plane, and therefore is also very weak, even though he is still quite young. "It's the remains of a star that died less than 9,000 years ago, which means the explosion could have been visible to Native Americans throughout Australia at the time."

An expert on cultural astronomy, Associate Professor Duane Hamacher of the University of Melbourne, some Aboriginal traditions describe new shining stars emerging in the sky. However, we do not know definitive traditions that describe this particular event. "Now that we know when and where this supernova appeared in the sky, we can work with indigenous elders to see if any of their traditions describe this cosmic event, if anything, it would be extremely exciting," he said. 19659016] Dr. med. According to Hurley-Walker, two of the discovered supernova remnants are quite unusual "orphans" found in a heavenly region where there are no massive stars. Other research supernova remnants discovered 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 give us a glimpse into the past in the Milky Way."




The MWA telescope is a forerunner of the world's largest radio "The MWA is perfect for finding these objects, but is limited in its sensitivity and resolution," Dr. Hurley Walker. "The low-frequency part of the SKA, built in the same place as the MWA, will be thousands of times more sensitive and have a much better resolution, so it should find the thousands of supernova remnants that have formed in the last 100,000 years on the other side of the Milky Way. "


The Australian desert telescope shows the sky in radio technology


Further information:
& # 39; In the GLEAM survey over 345 °, new candidate remains of Radiosupernova were discovered. Www.icrar.org/wp-content/uploa…etected_in_GLEAM.pdf

& # 39; Radiosupernova's candidate remnants observed in the 345 ° GLEAM survey. GLEAM) Survey II: Galactic Airplane 345 ° www.icrar.org/wp-content/uploa… erved_by_GLEAM-1.pdf

Provided by
International Center for Radio Astronomy Research

Quote :
Outback telescope conquers the center of the Milky Way and discovers remains of dead stars (2019, 20 November)
retrieved on November 20, 2019
from https://phys.org/news/2019-11-outback-telescope-captures-milky-center.html

This document is subject to copyright. Apart from any fair dealings for the purpose of private learning or research, no
Part may be reproduced without written permission. The content is for informational purposes only.


Source link