Astronomers using the MeerKAT Pulsar Timing Array, an international experiment using South Africa’s MeerKAT radio telescope, have discovered further evidence of gravitational wave signals originating from supermassive black hole mergers.
miles others. Created the most detailed map of gravitational waves throughout the universe to date. Image credit: Carl Knox / OzGrav / Swinburne University of Technology / South African Radio Astronomical Observatory.
“Our research opens up new avenues for understanding the universe we live in,” said astronomer Dr Matt Miles from the ARC Gravitational Wave Discovery Center (OzGRav) and Swinburne University of Technology. .
“By studying the background, we can listen to the echoes of cosmic events over billions of years. It reveals how galaxies and the universe itself have evolved over time.”
The MeerKAT Pulsar Timing Array observes and times pulsars (fast-spinning neutron stars) with nanosecond precision.
Pulsars act as natural clocks, and their steady pulses allow scientists to detect minute changes caused by passing gravitational waves.
This galaxy-scale detector provides the opportunity to map gravitational waves across the sky, revealing patterns and intensities that defy previous assumptions.
“The gravitational wave background is often thought to be uniformly distributed across the sky,” says Rowena Nathan, an astronomer at Ozgrab University and Monash University.
“The galaxy-sized telescope formed by the MeerKAT pulsar timing array allows us to map the structure of this signal with unprecedented precision, potentially revealing insights into its source.”
Astronomers have found further evidence of gravitational wave signals originating from merging supermassive black holes, capturing a signal more powerful than a similar global experiment in just one-third of the time.
“What we’re seeing suggests a much more dynamic and active Universe than we expected,” Dr. Miles said.
“We know that supermassive black holes are merging off Earth, but now we’re starting to know where they are and how many there are.”
Researchers used pulsar timing arrays to improve existing methods to build highly detailed gravitational wave maps.
This map revealed an interesting anomaly: an unexpected hotspot in the signal, suggesting a possible directional bias.
“The presence of a hotspot could point to a distinct source of gravitational waves, such as a pair of black holes billions of times more massive than the sun,” Nathan said.
“Looking at the arrangement and pattern of gravitational waves tells us how our universe exists today and contains signals from around the time of the Big Bang.”
“While there is still more work to be done to determine the significance of the hotspots we discovered, this is an exciting step forward for our field.”
“These discoveries raise exciting questions about the formation of supermassive black holes and the early history of the universe.”
“Further monitoring by the MeerKAT array could improve these gravitational wave maps and reveal new cosmic phenomena.”
“The research also has broader implications, with data that could help international scientists explore the origin and evolution of supermassive black holes, the formation of galactic structures, and even hints at early cosmic events. provided.”
The results were published in three papers. Royal Astronomical Society Monthly Notices.
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Matthew Miles others. 2024. MeerKAT Pulsar Timing Array: 4.5 Years of Data Release and Noise and Stochastic Signals in the Millisecond Pulsar Population. MNRASin press. doi: 10.1093/mnras/stae2572
Matthew Miles others. 2024. MeerKAT Pulsar Timing Array: The first search for gravitational waves with the MeerKAT radio telescope. MNRASin press. doi: 10.1093/mnras/stae2571
Kathryn Grandthal others. 2024. MeerKAT Pulsar Timing Array: Map of the gravitational wave sky with 4.5 years of data released. MNRASin press. doi: 10.1093/mnras/stae2573
Source: www.sci.news
