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The universe is filled with galaxy clusters – massive structures piled up at the intersection of the cosmic web. A single cluster can span millions of light years and consist of hundreds, or even thousands, of galaxies. However, these galaxies represent only a few percent of the total mass of the cluster. About 80% of it is dark matter, and the rest is hot plasma “soup”: gas heated to above 10,000,000℃ and entwined with weak magnetic fields. We and our team of international colleagues have identified a series of rarely observed radio objects – radio remains, radio halos, and radio emission fossils – in a highly dynamic galaxy cluster called Abell 3266. They challenge existing theories about the object’s origin. and their characteristics. Relics, halos and fossils Clusters of galaxies allow us to study a rich variety of processes – including magnetism and plasma physics – in environments that we cannot recreate in our laboratories. When the clusters collide with each...

A mysterious radio explosion with a pattern similar to a heartbeat has been detected in space. Astronomers estimate that the signal came from a galaxy about a billion light years away, but the exact location and cause of the explosion is unknown. A study detailing the findings published Wednesday in the journal Natural . Rapid radio bursts, or FRBs, are intense, millisecond-long bursts of radio waves of unknown origin. The first FRBs were discovered in 2007, and since then, hundreds of these rapid cosmic flashes have been detected coming from various distant points throughout the universe. Watch the latest News on Channel 7 or stream for free on 7plus >> Many FRBs release super-bright radio waves that last only a few milliseconds before disappearing completely, and about 10 percent of them are known to repeat and have patterns. Fast radio bursts are so fast and unpredictable that they are difficult to observe. One of the sources used to find them is a radio telescope called th...

Enlarge / An event on the surface of a magnetar can produce a rapid radio explosion. A fast radio burst is exactly what the name suggests: a sudden wave of photons at radio frequencies that often lasts less than a second. After the scientists finished convincing themselves that they saw no equipment interference, a search was carried out for what generated the large amounts of energy involved in fast radio bursts (FRBs). The discovery of the first iterative FRB tells us that the process that generates the FRB does not destroy the object that generated it. Eventually, FRBs were discovered that were associated with events at additional wavelengths, allowing their source to be identified: magnetars, the subset of neutron stars that have the most extreme magnetic fields in the Universe. While that shows excellent progress, it still doesn’t tell us anything about the physics of how the explosion was generated—knowledge that will probably tell us why most magnetars don’t and...

Astronomers at MIT and elsewhere have detected a strange and persistent radio signal from a distant galaxy that appears to flicker with surprising regularity. The signal is classified as a rapid radio burst, or FRB — a very powerful burst of radio waves of unknown astrophysical origin, which usually lasts a few milliseconds at most. However, this new signal lasted up to three seconds, about 1,000 times longer than the FRB average. Within this window, the team detected bursts of radio waves that repeated every 0.2 seconds in a clear periodic pattern, similar to a heartbeat. The researchers have labeled the signal FRB 20191221A, and it is currently the most durable FRB, with the clearest periodic pattern, detected to date. The source of the signal lies in a distant galaxy, a few billion light years from Earth. Exactly what the source is remains a mystery, although astronomers suspect the signal could be from a radio pulsar or a magnetar, both types of neutron stars – the cores of...

Astronomers at MIT and universities in Canada and the United States have detected a strange and persistent radio signal from a distant galaxy that seems to flicker with surprising regularity. The signal is classified as a rapid radio burst, or FRB — a very powerful burst of radio waves of unknown astrophysical origin, which usually lasts a few milliseconds at most. However, this new signal lasted up to three seconds, about 1,000 times longer than the FRB average. Within this window, the team detected bursts of radio waves that repeated every 0.2 seconds in a clear periodic pattern, similar to a heartbeat. The researchers have labeled the signal FRB 20191221A, and it is currently the most durable FRB, with the clearest periodic pattern, detected to date. The source of the signal lies in a distant galaxy, a few billion light years from Earth. Exactly what the source is remains a mystery, although astronomers suspect the signal could be from a radio pulsar or a magnetar, both types of ...

Rapid bursts of radio waves from millions to billions of light-years away can be used as probes to study the halos of the hard-to-see hazy gas that surrounds closer galaxies. These pulses, known as fast radio bursts (FRBs), slow down as they transit through the gas shrouding the galaxy between their source and Earth. This has the added consequence of their radio frequency scattering. Using this to investigate the galaxy’s gaseous halo, researchers from the California Institute of Technology (Caltech) found twice as much matter as previously believed in the envelope surrounding the galaxy. This has implications for how this collection of stars and planets evolves over long periods of time. Astronomers looked at a sample of 474 distant FRBs with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) which confirmed that the 24 FRBs intercepted by the galactic halo did indeed slow down compared to the others that traveled to Earth unimpeded. Thus, this effect can be used to in...