Telescopes hint at neutrino beacon at the heart of the Milky Way

Telescopes hint at neutrino beacon at the heart of the Milky Way
Correlating X-ray emissions from Sagittarius A, a massive black hole at the center of the Milky Way shown above, with IceCube Neutrino Observatory data, UW researchers have seen hints that the black hole is emitting neutrinos.  Credit: NASA
( —Identifying the sources of high-energy neutrinos—ghostly but potentially information-rich particles believed to be generated by some of the most violent objects in the sky—is near the top of many an astrophysicist's bucket list.

By their nature, high-energy are very difficult to detect and follow back to their points of origin. Things like gamma ray bursts, colliding galaxies, , newly forming stars and other dynamic celestial phenomena, scientists believe, are what kick-start and send them on their course through the cosmos. The subatomic particles have no charge, almost no mass, and can zip through planets, stars and entire galaxies without skipping a beat.

But thanks to a confluence of data from a suite of vastly different telescopes, including three orbiting X-ray telescopes and the IceCube Neutrino Observatory sunk deep into the ice beneath the South Pole, there are tantalizing clues that the massive black hole at the core of the Milky Way may be one such cosmic accelerator.

Should scientists confirm the observations, it would be the first time neutrinos have been detected emanating from a black hole.

In a recent paper published in the journal Physical Review D, a team led by University of Wisconsin-Madison physicist Yang Bai reports a correlation of IceCube data with a recorded burst of X-rays from Sagittarius A, an object at the center of our galaxy that is believed to be a .

"We have a hint that an IceCube neutrino is associated with a light source, an X-ray source," says Bai, a UW-Madison assistant professor of physics.

Last year, the IceCube Neutrino Observatory, run by an international collaboration at the UW-Madison-based Wisconsin IceCube Particle Astrophysics Center (WIPAC), reported the detection of 28 extremely high-energy neutrino events, the first time the most energetic form of neutrinos had been detected coming from extraterrestrial sources. Previously, less energetic forms of neutrinos were documented emanating from the supernova 1987a.

One of those very energetic IceCube events, according to Bai and his colleagues, was detected just a few hours after a bright, transient X-ray flare was observed emanating from Sagittarius A by the orbiting Chandra Observatory. Together with two other IceCube-detected particle showers nearest the plane of the galaxy, events that occurred within a day of each other and that were observed by the Swift X-ray Telescope and the Nuclear Spectroscopic Telescope Array (NuSTAR), the observation provides tentative evidence that very high energy neutrinos can be associated with a black hole.

"Thus, the determination that some IceCube events occur at similar times as X-ray flares and others occur in a burst could be the smoking gun that Sagittarius A is a point source of very high energy neutrinos," Bai and his colleagues write in their Physical Review D report.

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Journal information: Physical Review D

Citation: Telescopes hint at neutrino beacon at the heart of the Milky Way (2014, November 27) retrieved 25 May 2019 from
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Nov 27, 2014
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Nov 27, 2014
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Nov 27, 2014
Wow i have been waiting for this since 1987...

Nov 27, 2014
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Nov 27, 2014
Interesting. This is completely at odds with AWT. AWT just got dethroned, debunked, and is now deceased. I can't explain these inconsistencies. I wish there was someone around who could write a 3000 word post to explain it to me, but I suppose there isn't. Oh well, I also suppose there is no one here who minds if the world consensus is that AWT has always been wrong. I'll put the word out on the street. At the corner of Cosmology Ave. and Astrophysics Blvd. I wonder why no one here champions this misunderstood, but still totally wrong and entirely debunked, theory.

Nov 28, 2014
@Selena: Your idea of a connection between SagA behavior and climate is spurious. There is no support in these observations for a change in Earth's energy balance.

And the latter topic is contentious: "The cause or causes of this hemispheric decoupling, of the "lead/lag" pattern, and of the specific mechanisms of the warming and cooling trends, are subjects of study and dispute among climate researchers. The specific dating and intensity of the Antarctic Cold Reversal are also under debate.[7]"

[ http://en.wikiped...Reversal ]

@Rookie King: Hilarious! That is one way to handle trolls...

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