Canada 'Ghost particle' reveals source of mysterious cosmic rays

06:57  13 july  2018
06:57  13 july  2018 Source:   cbc.ca

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Scientists think they’ve tracked down a source of mysterious high-energy cosmic rays that have been puzzling for over a century. The trail of a “ ghost particle " detected in Antarctica pointed the way. Watch the news conference LIVE starting 11 a.m. ET.

Researchers believe a galactic "monster" is a source of cosmic neutrinos detected on Earth. Image caption The discovery was made at the IceCube detector in Antarctica. Ghost -like particles known as neutrinos have been puzzling scientists for decades.

a close up of an animal: This artist's conception shows a blazar - the core of an active galaxy powered by a supermassive black hole. A neutrino detected at the South Pole last September has pointed to a blazar as a source of cosmic rays. © M. Weiss/CfA This artist's conception shows a blazar - the core of an active galaxy powered by a supermassive black hole. A neutrino detected at the South Pole last September has pointed to a blazar as a source of cosmic rays.

For more than 100 years, scientists have speculated about the origin of high-energy cosmic rays, a rain of charged particles that bombard Earth from space at close to light speed.

Now a global team of hundreds of researchers says it thinks it has tracked down a source of some of the highest-energy cosmic rays: an unusual galaxy called a blazar about four billion light-years from Earth in the constellation Orion. The findings were unveiled at a news conference Thursday morning.

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Researchers believe a galactic "monster" is a source of cosmic neutrinos detected on Earth. Image caption The discovery was made at the IceCube detector in Antarctica. Ghost -like particles known as neutrinos have been puzzling scientists for decades.

Cosmic rays are high-energy radiation, mainly originating outside the Solar System and even from distant galaxies. Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the surface.

The researchers found the culprit by using telescopes around the world to follow the trail of a "ghost particle" called a high-energy neutrino that hit a massive underground detector in Antarctica last September.

Such particles " are really a smoking gun for where very high-energy cosmic rays are being produced in the universe," said Darren Grant, a University of Alberta physics professor and the spokesperson for the IceCube Collaboration, which runs the neutrino detector. It includes researchers from 12 countries, including Canada.

It's the first time a high-energy neutrino has been tracked back to its origin, far beyond our solar system. That opens the door to a brand-new type of astronomy, the researchers report today in the journal Science — one that uses not just light but also subatomic particles to probe objects in deep space.

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Since cosmic rays were discovered in the early 1900s, scientists have been working to find the source of the The path of the “ ghost ” particle was traced back to a spot in the sky near the constellation of READ MORE: Report reveals outdated NASA policy poses contamination risk for Earth, universe.

These particles pour down on Earth from the sun, but they mostly pass unimpeded, like ghosts , through regular matter. One of those cosmic mysteries could include an explanation for dark matter, the mysterious stuff that is five times more common in the universe than What Are Cosmic Rays ?

"It's a new window into our universe," Grant said.

In this artistic rendering, which is based on a real image of the IceCube Lab at the South Pole, a distant source emits neutrinos that are detected below the ice by IceCube sensors. © IceCube/NSF In this artistic rendering, which is based on a real image of the IceCube Lab at the South Pole, a distant source emits neutrinos that are detected below the ice by IceCube sensors.

Ghosts in the accelerator

Neutrinos are tiny, neutral particles nicknamed "ghost particles" because most of the time they pass right through stars, people and other matter without interacting with it. Billions of low-energy neutrinos from the sun pass through one of your thumbnails every second.

But astronomers have long thought some high-energy neutrinos on Earth originate in deep space, in cosmic particle accelerators like exploding stars or the violent conditions that suck matter into super-massive black holes. Such conditions also generate cosmic rays, said Grant. "They come hand in hand."

Those conditions include the black hole at the centre of a blazar. A blazar is a special type of bright galaxy found only far, far from our own Milky Way galaxy and called a quasar. What makes a blazar special is that it's positioned in a way that fires jets of light directly at Earth, making it easy to observe that light with telescopes.

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Sweeping Study Confirms the Unknown About Mysterious Cosmic Rays . Unraveling the mystery of these particles ’ origins could reveal deep secrets about black holes, the formation of galaxies, and even the Big Bang itself.

That jet contained neutrinos — subatomic particles so tiny and difficult to detect they are nicknamed “ ghost particles .” also solved a mystery that stumped scientists for generations: What is the source of mysterious cosmic rays ? Cosmic rays reveal mysterious void in Egypt's Great Pyramid.

More than 2,000 blazars have been found, and scientists have long proposed they might be a source of cosmic rays.

a screenshot of a video game: The IceCube observatory in Antarctica detected a high-energy neutrino in deep space. The trail left in the detector pointed back to a place in the sky where astronomers spotted a blazar, a type of very bright, distant galaxy with a supermassive black hole at its centre. Because neutrinos and cosmic rays are produced together, this means the blazar is a source of cosmic rays. © Philip Street/CBC News The IceCube observatory in Antarctica detected a high-energy neutrino in deep space. The trail left in the detector pointed back to a place in the sky where astronomers spotted a blazar, a type of very bright, distant galaxy with a supermassive black hole at its centre. Because neutrinos and cosmic rays are produced together, this means the blazar is a source of cosmic rays.

It's impossible to track cosmic rays that hit Earth back to their source because they're charged particles that get pushed and pulled by the web of magnetic fields that criss-cross the universe, taking a meandering path that changes direction many times.

But because high-energy neutrinos don't interact with magnetic fields or matter, they're thought to travel in a straight line from their source to Earth.

Of course, they're just as unlikely to hit Earth as anything else. So researchers tried to maximize their chances of a neutrino hitting their detector by building one that was truly massive. Its sensors are embedded in a cubic kilometre of ice beneath the South Pole.

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When a particle , such as a muon, bounces through the tube, the current it creates is amplified to the point where the detector can pick it up. Cosmic rays : reveal a mysterious void in the Great Pyramid of Egypt.

The new results show an unexpected surplus of cosmic ray electrons at very high energy — 300-800 billion electron volts — that must come from a previously unidentified source or from the annihilation of very exotic theoretical particles used to explain dark matter.

a close up of a device: To maximize the chances of a neutrino hitting their detector, the researchers built one that is truly massive. IceCube's sensors are embedded in a cubic kilometre of ice beneath the South Pole. © IceCube collaboration To maximize the chances of a neutrino hitting their detector, the researchers built one that is truly massive. IceCube's sensors are embedded in a cubic kilometre of ice beneath the South Pole.

A cross-section of the detector is about 140 times bigger than the Russian soccer field where Croatia defeated England in the World Cup soccer semifinal yesterday. It's more than 2.5 kilometres deep.

And on Sept. 22, 2017, the scientists won the cosmic lottery. A high-energy neutrino that had been travelling at the speed of light straight through galaxies, stars, planets and magnetic fields for four billion years smacked into the centre of an atom in the ice just outside the detector.

The neutrino had an energy 40 times that of the protons produced by the biggest particle accelerator on Earth, the Large Hadron Collider. The impact generated a particle called a muon, which kept going. It plowed through the entire detector for more than a kilometre, leaving behind a straight, diagonal trail, lighting up sensors along the way.

University of Alberta physicist Claudio Kopper did a lot of the analysis that identified it as a high-energy neutrino from deep space and extrapolated where in the sky it had come from, Grant said. As they do around once a month, they sent the co-ordinates to their colleagues at telescopes around the world to see if they could spot where the neutrino came from.

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Speaking of Science. Cosmic rays reveal mysterious void in Egypt's Great Pyramid. But they're not undetectable to physicists, who can use the particles ' trajectory to peer through otherwise impenetrable substances, the way an X- ray reveals a fractured bone. We went to the source .

A particle detector floating 250 miles (400 kilometers) above Earth has analyzed 41 billion cosmic - ray particles , and the data have revealed new insights into the mysterious But there's a huge excess of positrons relative to electrons, so physicists don't think cosmic rays are the only source of positrons.

A space telescope called Fermi, operated by NASA, spotted a known blazar in that direction, called TXS 0506+056, that had suddenly started flaring — emitting a lot of light. Fermi looks for gamma ray light, which has an energy similar to that of neutrinos and is thought to come from the same processes.

a group of people standing outside of a building: Four members of the collaboration stand in front of the IceCube Neutrino Observatory at Amundsen-Scott South Pole Station in Antarctica. The collaboration includes hundreds of researchers in 12 countries, including Canada. © Martin Wolf/IceCube/NSF Four members of the collaboration stand in front of the IceCube Neutrino Observatory at Amundsen-Scott South Pole Station in Antarctica. The collaboration includes hundreds of researchers in 12 countries, including Canada.

Fermi sent another alert, and yet more telescopes that specialize in seeing different colours of light and radiation scrambled to have a look. In the end, it was observed by 20 telescopes from the Canary Islands to Chile to Japan, and many of those also saw flaring.

Coincidence?

Of course, this was only one neutrino.

Researchers calculated there's a one-in-1,000 chance that the sight of the neutrino and the blazar flaring at the same time was a coincidence, according to Anna Frankowiak, a researcher at Deutsches Elektronen-Synchrotron (DESY) in Germany, who did a statistical analysis.

So researchers looked at their old data and found more than a dozen other high-energy neutrinos from the blazar's direction during flaring events n 2014 and 2015, before IceCube started sending alerts to astronomers in 2016.

The chance that those events were also coincidences were estimated to be 1 in 5,000.

The fact that chances of coincidences are so small from two independent measurements gives researchers confidence that the blazar is where the neutrino came from, Grant said.

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A mysterious surplus of energetic particles called cosmic rays is striking the Earth from the Lower energy cosmic rays are thought to come from the shock waves around supernovae, but the source Now, observations have revealed what appears to be a broad area of enhanced cosmic ray activity

Studies of cosmic rays opened the door to a world of particles beyond the confines of the atom: the first particle of antimatter , the positron (the antielectron) was discovered in 1932, the muon in 1937, followed by the pion, the kaon and several more.

a large body of water: The Very Large Array telescope in New Mexico, which starred in the movie Contact, is one of 20 telescopes around the world that observed the blazar. © Alex Savello The Very Large Array telescope in New Mexico, which starred in the movie Contact, is one of 20 telescopes around the world that observed the blazar.

Gregory Sivakoff, a University of Alberta researcher, and his team had to write an emergency proposal and get it approved by peer reviewers in just days so they could study the blazar using the Very Large Array radio telescope in New Mexico.

He says this is the first step in proving blazars are a source of cosmic rays, but there is lots of work to do. For one thing, astronomers don't like to base all their conclusions on one source. And even if blazars are confirmed to be a source of cosmic rays on Earth, researchers want to know what fraction of the rays they produce.

More importantly, he said, the study opens up new avenues — effectively new senses — for observing the universe, the way we can enjoy a meal by seeing, smelling, tasting and feeling it. For a long time, astronomers were limited to observing space with the light detected using telescopes. But that's changed with the recent ability to track gravitational waves — and now neutrinos — to objects in space.

" We're entering an age where we're able to use more than one sense at the same time, and I think it will lead to a much greater understanding of how the universe works."

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