A type of variable radio signal coming from the center of the Milky Way galaxy, with a very strange behavior that shows the attention of scientists Astronomers have discovered unusual radio signals that appear to be coming to Earth from the center of the Milky Way galaxy. These radio waves are incomprehensible with existing patterns for variable radio sources and may lead to the formation of a new classification of stellar objects. " The characteristic of this new signal is that it has a very high polarization. This means that although its waves fluctuate in only one direction, this direction rotates with time. The brightness of the mass also changes dramatically by a factor of 100, and appears to turn on and off randomly. "Behavior we've never seen before."
Many types of stars emit variable light across the electromagnetic spectrum, and with many advances in radio astronomy, the study of these variable or transient objects is the subject of extensive research. Mankind helps to explore the mysteries of the universe. Supernovae, supernovae, bright stars, and "rapid radio bursts" (FRBs) are all types of celestial bodies whose brightness varies.
Wang said, "At first we thought this mysterious signal could be a supernova ( Is a very dense type of dead and intensely rotating star) or even otherwise a star that emits huge flares. "But the signals from this new source do not match what we expect from these types of celestial bodies." Among the Australian Scientific and Industrial Research Organization (CSIRO) are Germany, the United States, Canada, South Africa, Spain and France, made possible by the Australian Square Array Routing Telescope (ASKAP) and then the Mercat Telescope in South Africa. .
Australian Square Kilometer Array
Tara Murphy, a professor at the Sydney Institute of Astronomy and the School of Physics, led the study. We are called Slow Transient Variables and Events (VAST) in 2020 and 2021. " Is. The object was hidden at the time of diagnosis, then glowed and faded and reappeared. "This behavior was very unexpected."
After detecting six radio signals from the source over a nine-month period, astronomers tried to see it in visible light but found nothing. Even with the Parkes radio telescope, the radio source was not identified. The signal was monitored every 15 weeks for 15 minutes to find it again. "Fortunately, the signal returned, but the behavior of the source had changed dramatically," he said. "The source disappeared overnight, while in previous observations by ASKAP it had taken several weeks." "The information we have bears similarities to an emerging classification of unknown objects known as transient events at the center of the galaxy, such as something called the cosmic spring," said David Kaplan of the University of Wisconsin-Milwaukee. "Despite the similarities of the new ASKAP J173608.2-321635 crime, there are some differences that we do not fully understand the source of, and this adds to the complexity of the issue," he said.
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Scientists plan to monitor the object closely for more clues Find. In the next decade, a square-kilometer array radio telescope (SKA) will be launched, which Murphy says can make accurate maps of the sky every day.
The telescope's power will help scientists solve mysteries like the recent discovery, but In addition, it will explore large new parts of the universe to explore the radio spectrum.
Cover photo: Graphic design of the mysterious ASKAP
J173608.2-321635 radio signal
Credit: Credit: Sebastian Zentilomo/University of Sydney