Latest news with #VeryLongBaselineArray
Yahoo
4 days ago
- Science
- Yahoo
This real 'Eye of Sauron' spits out ghost particles in space. Here's what it looks like
When you buy through links on our articles, Future and its syndication partners may earn a commission. For about 15 years, a powerful radio telescope on planet Earth dutifully recorded data about a location in the cosmos billions of light-years away from us — and, at last, astronomers managed to stitch together those extensive observations to reveal a full picture of what this telescope has been looking at. It's … the Eye of Sauron! Well, sort of. Though the image you're seeing bears a striking resemblance to the jarring symbol associated with the main villain in the Lord of the Rings trilogy of novels by J.R.R. Tolkien, it's actually something far more fear-inducing. At face value, at least. What you're looking at is actually a blazar, which requires a couple of layers to explain. Out in the universe, there are these things called quasars, which refer to the extremely luminous centers of active galaxies (meaning they emit a lot of electromagnetic radiation) that are powered by supermassive black holes. These galactic cores are called active galactic nuclei, or AGNs; and in fact, the monster black holes powering these phenomena can also funnel matter outward in the form of highly energetic jets of particles moving at nearly the speed of light. It's all very intense. Quasars can be so bright that they outshine the collective light of every single star in the galaxy surrounding them. Blazars, on the other hand, are pretty much quasars — except with those supermassive-black-hole-rooted jets pointing within 10 degrees of our planet. That doesn't exactly mean we're about to be obliterated by a jet, though. Remember how I said the fear remains at face value? The only reason we're seeing the jet pointing straight toward us is because of our vantage point, and this doesn't necessarily increase its danger. Still, blazars, because of this serendipitous orientation, tend to appear even brighter than the already ridiculously bright quasars. Not that it matters, but Sauron would sure love them. "When we reconstructed the image, it looked absolutely stunning," Yuri Kovalev, lead author of the study and principal investigator of the Multi-messenger Studies of Extragalactic Super-colliders project at the Max Planck Institute for Radio Astronomy (MPIfR), said in a statement. "We have never seen anything quite like it — a near-perfect toroidal magnetic field with a jet, pointing straight at us." "This alignment causes a boost in brightness by a factor of 30 or more," explains Jack Livingston, a study co-author at MPIfR. "At the same time, the jet appears to move slowly due to projection effects — a classic optical illusion." And this particular blazar could be the one blazar to rule them all. Scientists have formed a clear image of it using observations from the Very Long Baseline Array (named PKS 1424+240), and it may very well be one of the brightest sources of high-energy gamma rays and cosmic neutrinos ever observed. Neutrinos are mind-blowing items themselves, while we're at it. They're nicknamed "ghost particles" because they're invisible, zippy bits that penetrate the entirety of our cosmos yet remain tremendously difficult to detect. Trillions of these particles are flowing through your body as you read this, but you can't tell because they don't interact with any of the particles that make up your body. They slide right through. The IceCube Neutrino Observatory near the South Pole, specifically built to pin down neutrinos, is actually the institution that discovered PKS 1424+240 in the first place because of its super high neutrino emission levels. Solving this puzzle confirms that active galactic nuclei with supermassive black holes are not only powerful accelerators of electrons, but also of protons — the origin of the observed high-energy neutrinos," concludes Kovalev. Reconstructing the spectacular blazar, according to the discovery team, also allows astronomers to peer directly into the "heart" of this jet — and that could be great news for scientists trying to understand the dynamics of these awesome objects. Kovalev explains that it confirms AGNs with supermassive black holes don't only accelerate electrons (negatively charged particles that make up atoms) but also protons. This is a big find, the researcher explains, because that explains the origin of the high-energy neutrinos PKS 1424+240 appears to be spitting out. A study about these results was published on Tuesday (Aug. 12) in the journal Astronomy & Astrophysics Letters. Solve the daily Crossword
Daily Mail
5 days ago
- Science
- Daily Mail
Scientists are baffled after spotting the 'Eye of Sauron' in deep space
The Eye of Sauron is an integral part of the Lord of the Rings series. The flaming, floating fiery eyeball, positioned atop a dark tower in Mordor, is a symbol of the Dark Lord's all–seeing power and vigilance. Now, experts have detected a similarly terrifying vision in real life. But rather than looking for Frodo or the Ring, it seems to be peering directly at us from deep space. The image is of a phenomenon called a cosmic jet, which is an extremely powerful stream of plasma and energy emitted from celestial objects. This particular one comes from a blazar – a type of galaxy powered by a supermassive black hole. The PKS 1424+240 blazar is one of the brightest in the sky despite being located billions of light–years away. And as well as a foreboding picture, the discovery may have helped researchers solve a decades–long cosmic puzzle. The blazar has long baffled astronomers as its cosmic jet appeared to move slowly, despite it being one of the brightest sources of high–energy gammas rays and cosmic neutrinos ever observed. This contradicted the belief that only the fastest jets could be behind such exceptional brightness. Using 15 years of ultra–precise radio observations from the Very Long Baseline Array – a system of 10 radio telescopes – researchers were able to stitch together a deep image of the jet at unparalleled resolution. 'When we reconstructed the image, it looked absolutely stunning,' lead author Yuri Kovalev, from the Max Planck Institute for Radio Astronomy, said. 'We have never seen anything quite like it—a near–perfect toroidal magnetic field with a jet, pointing straight at us.' Since the jet is aligned almost exactly in the direction of Earth, its high–energy radio emissions are dramatically amplified. 'This alignment causes a boost in brightness by a factor of 30 or more,' co–author Jack Livingston said. 'At the same time, the jet appears to move slowly due to projection effects—a classic optical illusion.' This head–on view also gave scientists the extremely rare opportunity to peer directly into the heart of the blazar's jet. Radio signals helped the team map out the structure of the jet's magnetic field, revealing it is likely helical (a spiral) or toroidal (doughnut–shaped). This structure likely plays a key role in accelerating particles to extreme energies, the researchers said. The findings were published in the journal Astronomy & Astrophysics. Black holes are so dense and their gravitational pull is so strong that no form of radiation can escape them - not even light. They act as intense sources of gravity which hoover up dust and gas around them. Their intense gravitational pull is thought to be what stars in galaxies orbit around. How they are formed is still poorly understood. Astronomers believe they may form when a large cloud of gas up to 100,000 times bigger than the sun, collapses into a black hole. Many of these black hole seeds then merge to form much larger supermassive black holes, which are found at the centre of every known massive galaxy. Alternatively, a supermassive black hole seed could come from a giant star, about 100 times the sun's mass, that ultimately forms into a black hole after it runs out of fuel and collapses. When these giant stars die, they also go 'supernova', a huge explosion that expels the matter from the outer layers of the star into deep space.
