We have detected a strange new signal from across the chasm of time and
space.
A repeating fast radio burst source detected last year was recorded spitting
out a whopping 1,863 bursts over 82 hours, amid a total of 91 hours of
observation.
This hyperactive behavior has allowed scientists to characterize not just
the galaxy that hosts the source and its distance from us, but also what the
source is.
The object, named FRB 20201124A, was detected with the Five-hundred-meter
Aperture Spherical radio Telescope (FAST) in China and described in a new
paper led by astronomer Heng Xu of Peking University in China.
So far most evidence points to a magnetar – a neutron star with
extraordinarily strong magnetic fields – as a source of FRB emissions like
this.
If FRB 20201124A is indeed from one of these wild cosmic beasts, it's
looking like an unusual specimen.
"These observations brought us back to the drawing board," says astrophysicist Bing Zhang of the University of Nevada, Las Vegas.
"It is clear that FRBs are more mysterious than what we have imagined. More
multi-wavelength observational campaigns are needed to further unveil the
nature of these objects."
Fast radio bursts have been a source of puzzlement to astronomers since they
were first discovered 15 years ago, in archival data dating back to 2001: A
spike of incredibly powerful radio emission lasting just an eyeblink of
time.
Since then, many more have been detected: millisecond-duration bursts of
radio waves, discharging in that moment as much power as 500 million Suns.
Most on record have erupted just the once, making them challenging to study
(let alone understand). A scant handful have been detected repeating, which
has helped scientists at least trace them to host galaxies.
Then, in 2020, a breakthrough. For the first time, a fast radio burst was
detected within the Milky Way – leading astrophysicists to trace the
phenomenon to magnetar activity.
This most recent extraordinary FRB example is another example of a rare
repeater. In less than two months of observation, FRB 20201124A has given
astronomers the biggest sample of fast radio burst data with polarization
than any other FRB source.
Polarization refers to the orientation of light waves in three-dimensional
space. By examining how much that orientation has changed since the light
departed its source, scientists can understand the environment through which
it has passed. Strong polarization suggests a powerful magnetic environment,
for example.
Based on the wealth of data delivered by FRB 20201124A, astronomers were
able to infer that the source is a magnetar.
But there was something strange. The way the polarization changed over time
suggested that the strength of the magnetic field and density of particles
around the magnetar were fluctuating.
"I equate it to filming a movie of the surroundings of an FRB source, and
our film revealed a complex, dynamically evolving, magnetized environment
that was never imagined before," Zhang explains.
"Such an environment is not straightforwardly expected for an isolated
magnetar. Something else might be in the vicinity of the FRB engine,
possibly a binary companion."
That companion, the data suggest, could be a hot, blue Be-type star, which
are often found in companions with neutron stars. The evidence for this was
laid out in a separate paper, led by astronomer Fayin Wang of Nanjing
University in China.
But there was something else peculiar, too.
As a type of neutron star, magnetars are the collapsed cores of massive
stars that, having run out of fuel to burn and provide outward pressure,
collapse under their own gravity.
Such stars burn through their fuel quickly, and have short lives, expelling
their outer material in a supernova as the core collapses.
Because their lives are so brief, these young magnetars are thought to be
found in regions where star formation is still occurring. Stars live their
short lives and die, creating more clouds of material to give birth to more
stars. It's a beautiful cosmic circle of life.
But FRB 20201124A was found in a galaxy a lot like the Milky Way. There's
not a lot of star formation going on here at home, so there shouldn't be a
baby boom of stars near our unusual new FRB friend either.
FRB 20201124A isn't the only FRB source to be found in a galaxy relatively
devoid of star formation, though.
The growing count suggests that there's some vital piece of information we
may be missing, some hole in our understanding of FRB magnetars, how they
form, and the locations in which they reside.
But the characterization of the source means we have a new place to look for
answers. The work of Wang and his colleagues suggests that neutron star-Be
star binaries might be one of the best places to look for fast radio
burst-like signals.
The two papers have been published in Nature and Nature Communications.
Reference:
Xu, H., Niu, J.R., Chen, P. et al. A fast radio burst source at a complex
magnetized site in a barred galaxy. Nature 609, 685–688 (2022).
DOI: 10.1038/s41586-022-05071-8
Wang, F.Y., Zhang, G.Q., Dai, Z.G. et al. Repeating fast radio burst 20201124A
originates from a magnetar/Be star binary. Nat Commun 13, 4382 (2022).
DOI: 10.1038/s41467-022-31923-y
Tags:
Space & Astrophysics