Decades of Hunting Detects Footprint of Cosmic Ray Superaccelerators in Our Galaxy
Masks needed! Superspreaders!
American Physical Society \ Phys.org | March 31, 2021
An enormous telescope complex in Tibet has captured the first evidence of ultrahigh-energy gamma rays spread across the Milky Way. The findings offer proof that undetected starry accelerators churn out cosmic rays, which have floated around our galaxy for millions of years. The research is to be published in the journal Physical Review Letters on Monday, April 5.
IMAO beat you by three days!
“We found 23 ultrahigh-energy cosmic gamma rays along the Milky Way,” said Kazumasa Kawata, a coauthor from the University of Tokyo. “The highest energy among them amounts to a world record: nearly one petaelectron volt.”
PETA electrons? I thought those were too close to cull.
That’s three orders of magnitude greater than any known cosmic-ray-induced gamma ray — or any particle humans have accelerated in state-of-the-art laboratories on Earth.
I had a wisecrack here, but Walrus told me it was no good.
Since 1990, dozens of researchers from China and Japan have hunted for the elusive high-energy cosmic gamma rays.
I had a wisecrack here, but Walrus told me it was even worse.
The Tibet ASγ Collaboration made its discovery using nearly 70,000 square meters of ground arrays and underground muon detectors on the Tibetan Plateau, sitting more than 14,000 feet above sea level.
Are they asking me to believe that Tibetans have invested in this research, while ignoring their own poverty?
“Scientists believe high energy gamma rays can be produced by the nuclear interaction between high-energy cosmic rays escaping from the most powerful galactic sources and interstellar gas in the Milky Way galaxy,” said Huang Jing, a coauthor from Institute of High Energy Physics, Chinese Academy of Sciences.
And now . . .
Chen Ding
Same guy as Huang Jing?
of the National Astronomical Observatories, Chinese Academy of Sciences, another coauthor, added, “The detection of diffuse gamma rays above 100 teraelectron volts is a key to understanding the origin of very-high-energy cosmic rays, which has been a mystery since their discovery in 1912.”
Pro tip: That’s the worst pickup line ever, gentlemen.
Balloon experiments
No comment. Even I could see it was no good, without running it by Walrus.
first identified cosmic rays, revealing they were a key source of radiation on Earth. Cosmic rays are highly energetic particles, mostly protons, that travel across space. Millions of these particles pass through your body every day. (They are believed harmless.)
Thanks, Doc. That parenthetical comment inspires confidence.
“We live together with cosmic-ray muons,
I must insist you speak for yourself!
though we are usually not sensitive to them,” said Kawata. “Isn’t it a fantasy to think of where and how these cosmic rays are produced and accelerated, traveling all the way to Earth?”
You and I, Kawata, part company here! If you are interested in fantasy, I may discuss Ginger and Mary Ann with you some day.
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