Origin of 'ghost particle' traced to distant black hole
Washington, July 13 : For the first time, scientists have found the source of a high-energy ghostly particle, known as neutrino, that travelled 3.7 billion years at almost the speed of light to reach Earth.
Using NASA's Fermi Gamma-ray space telescope, scientists traced the path of this hard-to-catch particle to a blast of gamma-ray light from a distant supermassive black hole in the constellation Orion.
Scientists believe that high-energy neutrinos are created by the most powerful events in the cosmos, such as galaxy mergers and material falling onto supermassive black holes.
They travel at speeds just shy of the speed of light and rarely interact with other matter, allowing them to travel unimpeded across distances of billions of light-years.
The findings detailed in the journal Science marked the detection of the source of such a particle for the first time.
"Again, Fermi has helped make another giant leap in a growing field we call multimessenger astronomy," said Paul Hertz, Director of the Astrophysics Division at NASA Headquarters in Washington.
"Neutrinos and gravitational waves deliver new kinds of information about the most extreme environments in the universe. But to best understand what they're telling us, we need to connect them to the 'messenger' astronomers know best - light," Hertz added.
The neutrino was discovered last year in Antarctica by an international team of scientists using the US National Science Foundation's IceCube Neutrino Observatory.
It hit the Antarctic ice with the energy of about 300 trillion electron volts -- more than 45 times the energy achievable in the most powerful particle accelerator on Earth.
This high energy strongly suggested that the neutrino had to be from beyond our solar system.
Backtracking the path through IceCube indicated where in the sky the neutrino came from, and automated alerts notified astronomers around the globe to search this region for flares or outbursts that could be associated with the event.
Data from Fermi revealed enhanced gamma-ray emission from a well-known active galaxy at the time the neutrino arrived.
This is a type of active galaxy called a blazar, with a supermassive black hole with millions to billions of times the Sun's mass that blasts jets of particles outward in opposite directions at nearly the speed of light.
Blazars are especially bright and active because one of these jets happens to point almost directly toward Earth.
Fermi scientist Yasuyuki Tanaka at Hiroshima University in Japan was the first to associate the neutrino event with the blazar designated TXS 0506+056 (TXS 0506 for short), NASA said.
"The most extreme cosmic explosions produce gravitational waves, and the most extreme cosmic accelerators produce high-energy neutrinos and cosmic rays," said Regina Caputo of NASA's Goddard Space Flight Center in Greenbelt, Maryland.
"Through Fermi, gamma rays are providing a bridge to each of these new cosmic signals," Caputo said.
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Speeding truck collides with parked lorry in Raichur, driver killed
Raichur: A truck driver sustained serious injuries and died in a road accident in the taluk on Tuesday after his vehicle collided with a stationary truck near Mannikeri Camp on the outskirts of Javalagera.
The deceased driver, Amaresh Basavaraj, was travelling from Hospet to Raichur. Reportedly, he was driving at high speed and rammed into a parked truck carrying timber from Chikkamagaluru to Raichur.
Amaresh suffered severe head injuries, resulting in heavy bleeding, along with injuries to his stomach and knees. He was being taken to Sindhanur Taluk Hospital but reportedly died on the way near the Javalagera bus stand. The front of the truck he was driving was heavily damaged in the collision.
A case has been registered at Balagavoor Police Station, and Sub-Inspector Yariyappa Angadi is investigating the case.
