Summary
Enigmatic Flash of Energy Comes from Merging Galaxies
To the naked-eye, the sky looks deceptively quiet. But to radio astronomers there are powerful bursts of energy that pop off all over the sky like camera flashes at a stadium performance. The gusher of radiation released can briefly outshine an entire galaxy. The blasts come and go so fast, winking out in less than a couple seconds, they've earned the name fast radio bursts (FRBs). Though the triggering mechanism is unknown, it must involve extreme physics, perhaps the collision of black holes or neutron stars. They are hard to pin down. Astronomers using Hubble had to peer halfway back to the big bang to find the location of the farthest and brightest FRB to date. It exploded amongst a compact group of several early galaxies that may be in the process of merging. Coincidence or clue? Finding an FRB in a weird place may help astronomers unravel their mystery.
Full Article
Astronomers using NASA's Hubble Space Telescope have found a rare event in an oddball place.
It's called a fast radio burst (FRB), a fleeting blast of energy that can – for a few milliseconds – outshine an entire galaxy. Hundreds of FRBs have been detected over the past few years. They pop off all over the sky like camera flashes at a stadium event, but the sources behind these intense bursts of radiation remain uncertain.
This new FRB is particularly weird because it erupted halfway across the universe, making it the farthest and most powerful example detected to date.
And if that's not strange enough, it just got weirder based on the follow-up Hubble observations made after its discovery. The FRB flashed in what seems like an unlikely place: a collection of galaxies that existed when the universe was only 5 billion years old. The large majority of previous FRBs have been found in isolated galaxies.
FRB 20220610A was first detected on June 10, 2022, by the Australian Square Kilometer Array Pathfinder (ASKAP) radio telescope in Western Australia. The European Southern Observatory's Very Large Telescope in Chile confirmed that the FRB came from a distant place. The FRB was four times more energetic than closer FRBs.
"It required Hubble's keen sharpness and sensitivity to pinpoint exactly where the FRB came from," said lead author Alexa Gordon of Northwestern University in Evanston, Illinois. "Without Hubble's imaging, it would still remain a mystery as to whether this was originating from one monolithic galaxy or from some type of interacting system. It's these types of environments – these weird ones – that are driving us toward better understanding the mystery of FRBs."
Hubble's crisp images suggest this FRB originated in an environment where there may be as many as seven galaxies on a possible path to merging, which would also be very significant, researchers say.
"We are ultimately trying to answer the questions: What causes them? What are their progenitors and what are their origins? The Hubble observations provide a spectacular view of the surprising types of environments that give rise to these mysterious events," said co-investigator Wen-fai Fong, also of Northwestern University.
Though astronomers do not have a consensus on the possible mechanism behind this extraordinary phenomenon, it's generally thought that FRBs must involve some sort of compact object, like a black hole or neutron star. One extreme type of neutron star is called a magnetar – the most intensely magnetic type of neutron star in the universe. It has a magnetic field that is so strong that, if a magnetar were located halfway between Earth and the Moon, it would erase the magnetic strip on everyone's credit card in the world. Much worse yet, if an astronaut traveled within a few hundred miles of the magnetar, they would effectively be dissolved, because every atom in their body would be disrupted.
Possible mechanisms involve some kind of jarring starquake, or alternatively, an explosion caused when a magnetar's twisting magnetic field lines snap and reconnect. A similar phenomenon happens on the Sun, causing solar flares, but a magnetar's field is a trillion times stronger than the Sun's magnetosphere. The snapping would generate an FRB's flash, or might make a shock wave that incinerates surrounding dust and heats gas into a plasma.
There could be several flavors of magnetars. In one case, it could be an exploding object orbiting a black hole surrounded by a disk of material. Another alternative is a pair of orbiting neutron stars whose magnetospheres periodically interact, creating a cavity where eruptions can take place. It's estimated that magnetars are active for about 10,000 years before settling down, so they would be expected to be found where a firestorm of star birth is taking place. But this doesn't seem to be the case for all magnetars.
In the near future, FRB experiments will increase their sensitivity, leading to an unprecedented rate in the number of FRBs detected at these distances. Hubble will play a crucial role in characterizing the environments in which these FRBs occur. Astronomers will soon learn just how special the environment of this FRB was.
"We just need to keep finding more of these FRBs, both nearby and far away, and in all these different types of environments," said Gordon.
The results are being presented at the 243rd meeting of the American Astronomical Society in New Orleans, Louisiana.
The Hubble Space Telescope is a project of international cooperation between NASA and ESA. NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope. The Space Telescope Science Institute (STScI) in Baltimore, Maryland, conducts Hubble and Webb science operations. STScI is operated for NASA by the Association of Universities for Research in Astronomy, in Washington, D.C.
