Astronomers Discover New Millisecond Pulsar Using Murchison Widefield Array
A new millisecond pulsar has been detected by the Murchison Widefield Array (MWA), shedding light on the dense remnants of dead stars. This discovery could help refine our understanding of cosmic timekeeping and gravitational waves.
In a significant leap for radio astronomy, researchers using the Murchison Widefield Array (MWA) in Western Australia have identified a previously unknown millisecond pulsar—a rapidly spinning neutron star that beams radiation like a cosmic lighthouse. This discovery, part of the Southern-sky MWA Rapid Two-metre (SMART) survey, not only adds to the catalog of these extreme stellar objects but also provides fresh data to test Einstein’s theory of general relativity. The findings, published on arXiv and accepted by The Astrophysical Journal Letters, highlight the MWA’s growing role in uncovering hidden celestial phenomena.
- The newly discovered pulsar rotates approximately 300 times per second
- It was found in an area previously thought to lack such objects
- The SMART survey will continue scanning the southern sky through 2025
- Pulsar timing arrays may soon detect low-frequency gravitational waves
What Happened
An international team led by researchers from Curtin University detected the pulsar, designated PSR J0036-1033, during a systematic sweep of the southern sky. The MWA’s low-frequency radio capabilities (70-300 MHz) allowed it to spot the object’s characteristic pulses despite interference from Earth’s ionosphere. At just 15 arcminutes from a previously known pulsar, this finding challenges assumptions about how these objects are distributed. The team used specialized algorithms to identify the 2.5-millisecond periodicity in the radio waves—faster than the blade of a kitchen blender.
The Bigger Picture
Millisecond pulsars act as cosmic clocks, their precise rotations affected only by the fabric of spacetime itself. Networks of these pulsars (called Pulsar Timing Arrays) may soon detect the gravitational wave background from supermassive black hole collisions.
“This discovery demonstrates how much we still don’t know about our own galactic neighborhood,” said Dr. Ramesh Bhat, co-author and astrophysicist at the International Centre for Radio Astronomy Research.
The finding also validates the MWA’s unconventional low-frequency approach, which complements traditional pulsar searches at higher frequencies.
What Comes Next
The SMART team plans to confirm the discovery using higher-resolution telescopes like MeerKAT in South Africa. One challenge is distinguishing true pulsars from radio frequency interference, which has increased 100-fold since the 1960s. If verified, this pulsar will join the International Pulsar Timing Array network within 18 months. For astronomy enthusiasts, this means more accurate tests of general relativity and potentially the first detection of the gravitational wave background within this decade.
Q: How do millisecond pulsars form?
They’re neutron stars spun up by stealing matter from a companion star, reaching speeds up to 700 rotations per second.
Q: Why study pulsars with low-frequency radio?
Lower frequencies reveal different physics about the pulsar’s environment and are less affected by interstellar scattering.
