Astronomers Catch Mysterious Radio Blast From the Distant Universe
Coming from far beyond the galaxy, an extremely energetic blast of radio waves has been snared by astronomers lying in wait. Lasting for just a few thousandths of a second, the burst is the first of an enigmatic class of objects to be observed in real-time, astronomers report today in the Monthly Notices of the Royal Astronomical Society.
Called fast radio bursts, these extreme pulses of energy last for just a fraction of a second. They’ve confounded astronomers – who have no idea what they are – since West Virginia University’s Duncan Lorimer reported the first burst in 2007. At the time, it appeared as though the beam of radio waves had traveled roughly 3 billion light-years before colliding with Earth. That’s a reasonably far distance, even by astronomical standards. But not everyone believed the team’s interpretation. Skeptics suggested the burst’s signal could be coming from Earth’s atmosphere, or from inside the galaxy, or even that it was an artifact of the telescope itself, located at the Parkes Observatory in Australia.
Indeed, for five years, that Parkes telescope was the sole spotter of fast radio bursts, and eventually observed another half-dozen or so.
That changed in November 2012, when the Arecibo Observatory spotted a fast radio burst. Like the Parkes signals, it looked as though it came from billions of light-years away. While the observation strongly suggested the bursts were not a telescope artifact, scientists still had yet to see one in real time: All of the observations so far had been pulled from data that were at least a few weeks old.
Then, on May 14, 2014, Swinburne University’s Emily Petroff spotted a fast radio burst in the act of blasting. She and her colleagues determined the signal came from as far as 5.5 billion light-years away and was mildly polarized, suggesting a magnetic field somewhere near its origin has aligned the waves in particular directions.
Petroff had designed a program specifically to spy on these bursts, and once the radio pulse had been detected, she rallied a legion of telescopes to stare at the thing. Tasked with peering deep into the cosmos, the group of 12 telescopes quickly returned data suggesting there was no easily identifiable astrophysical source. The lack of a discernible afterglow eliminated some of the more mundane possibilities, such as distant supernovas or long gamma-ray bursts.
So what are these fast radio bursts? The short answer is, scientists still don’t know. “There are more theories than there are bursts,” Lorimer said last year. Some of those theories implicate rather exotic-sounding, very dense objects: Colliding black holes or neutron stars, evaporating primordial black holes, imploding neutron stars, or enormous flares erupting from magnetic neutron stars, called magnetars.
It’s a mystery that’s still waiting to be solved, but at least scientists now know their suspects live very, very far away and aren’t exceptionally secretive. Whatever the sources are, they regularly hurl beacons of radio light across a vast expanse of cosmic sea.
Go Further
Animals
- How scientists are piecing together a sperm whale ‘alphabet’How scientists are piecing together a sperm whale ‘alphabet’
- Orangutan seen using plants to heal wound for first timeOrangutan seen using plants to heal wound for first time
- What La Palma's 'lava tubes' tell us about life on other planetsWhat La Palma's 'lava tubes' tell us about life on other planets
- This fungus turns cicadas into zombies who procreate—then dieThis fungus turns cicadas into zombies who procreate—then die
Environment
- This floating flower is beautiful—but it's wreaking havoc on NigeriaThis floating flower is beautiful—but it's wreaking havoc on Nigeria
- What the Aral Sea might teach us about life after disasterWhat the Aral Sea might teach us about life after disaster
- What La Palma's 'lava tubes' tell us about life on other planetsWhat La Palma's 'lava tubes' tell us about life on other planets
- How fungi form ‘fairy rings’ and inspire superstitionsHow fungi form ‘fairy rings’ and inspire superstitions
- Your favorite foods may not taste the same in the future. Here's why.Your favorite foods may not taste the same in the future. Here's why.
- Are the Great Lakes the key to solving America’s emissions conundrum?Are the Great Lakes the key to solving America’s emissions conundrum?
History & Culture
- These were the real rules of courtship in the ‘Bridgerton’ eraThese were the real rules of courtship in the ‘Bridgerton’ era
- A short history of the Met Gala and its iconic looksA short history of the Met Gala and its iconic looks
- Meet the ruthless king who unified the Kingdom of Hawai'iMeet the ruthless king who unified the Kingdom of Hawai'i
- Hawaii's Lei Day is about so much more than flowersHawaii's Lei Day is about so much more than flowers
Science
- Why ovaries are so crucial to women’s health and longevityWhy ovaries are so crucial to women’s health and longevity
- Orangutan seen using plants to heal wound for first timeOrangutan seen using plants to heal wound for first time
Travel
- Why this unlikely UK destination should be on your radarWhy this unlikely UK destination should be on your radar