US News: Something Appears to Have Ripped a Massive Hole in the Milky Way's Edge - - PressFrom - United Kingdom
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US NewsSomething Appears to Have Ripped a Massive Hole in the Milky Way's Edge

18:25  19 may  2019
18:25  19 may  2019 Source:   newsweek.com

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Something appears to have torn a hole in part of the Milky Way ’ s halo. The “dark substructure” was found via Gaia observations—a project set out to produce the most detailed 3D map of our galaxy—with Harvard scientist Ana Bonaca noticing a perturbation in a tidal stream.

A supermassive black hole (SMBH or sometimes SBH) is the largest type of black hole , containing a mass of the order of hundreds of thousands, to billions of times, the mass of the Sun (M☉)

Something appears to have torn a hole in part of the Milky Way’s halo. The “dark substructure” was found via Gaia observations—a project set out to produce the most detailed 3D map of our galaxy—with Harvard scientist Ana Bonaca noticing a perturbation in a tidal stream.

She presented her findings at the American Physical Society’s April meeting.

As first reported by LiveScience, Bonaca was focusing on tidal streams produced by stars escaping from globular clusters—normally found at the edges of a galaxy. The stellar halo of the Milky Way is full of these tidal streams.

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"It' s much more massive than a star… Something like a million times the mass of the sun. So there are just no stars of that mass. I was gonna post some smartass comment but I love the way you not just quoted Mass Effect 2 but shoved trope pages in as well.

Something very large and dark occupies the center of our galaxy, and new data suggest that it is Please refresh to try again. Astronomers are probing the edge of Sagittarius A*, the supermassive black hole The evidence comes in the form of knots of gas that appear to orbit the galactic center. The results provide “strong support” that the dark thing in Sagittarius “is indeed a massive black hole ,” Dr

If there is nothing to disturb them, the streams are almost uniform in terms of their density. However, Bonaca noticed there was a hole in one. “The on-sky morphology suggests a recent, close encounter with a massive and dense perturber,” an abstract to her work reported.

What this “perturber” is, however, is unknown. "It's a dense bullet of something," Bonaca told LiveScience. Telescopes failed to find the source—so what could it be?

The hole is enormous, so whatever made it must also have been. "It's much more massive than a star,” she told the website. “Something like a million times the mass of the sun. So there are just no stars of that mass. We can rule that out. And if it were a black hole, it would be a supermassive black hole of the kind we find at the center of our own galaxy."

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An enormous “ something ” appears to have torn a hole in part of the Milky Way ’ s halo. The “dark substructure” was found via Gaia spacecraft Bonaca is a leading authority on how the tidal field of the Milky Way galaxy disrupts globular clusters, and what the resulting debris can tell us about the

Numerical models developed by the team indicate a disturbance in the transition zone forced the material up. This is thought to have taken place about 30 million years ago and provided the foundation that Bermuda sits Something Appears to Have Ripped a Massive Hole in the Milky Way ' s Edge .

The problem with this idea is that there are no signs of a supermassive black hole in the vicinity.

Something Appears to Have Ripped a Massive Hole in the Milky Way's Edge © Getty Images

At the moment, observations do not show any large luminous object (something made from ordinary matter, which reflects light) moving away from the hole. This led Bonaca to suggest the perturbation could have been made by dark matter. This is the mystery substance that makes up about 27 percent of the universe. Scientists know it is there because of the gravitational force it exerts on normal matter—but because it is “dark” in that it does not reflect light, and so we cannot see what it is.

“Observations permit a low-mass dark-matter subhalo as a plausible candidate,” Bonaca’s abstract says.

This dense blob of dark matter could have smashed through the tidal stream—if this is what caused the hole—and would be an exciting find for scientists, as it would provide them the opportunity of studying this elusive substance. The discovery of a dark matter “bullet” would also fit with current predictions about what dark matter is like—research suggests it is “clumpy,” in that it is not smooth and evenly distributed around the universe.

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> Something appears to have torn a hole in part of the Milky Way ’ s halo. The “dark substructure” was found via Gaia observations—a project set out to produce the most detailed 3D map of our galaxy—with Harvard scientist Ana Bonaca noticing a globular clusters—normally found at the edges of a galaxy.

There, a black hole several billion times more massive than the sun is unleashing a violent jet of energy Dr. Doeleman described the black hole in the center of the Milky Way as “a fascinating A version of this article appears in print on , on Page A1 of the New York edition with the headline

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Identifying a clump of dark matter “opens up the possibility that detailed observations of streams could measure the mass spectrum of dark-matter substructures and even identify individual substructures,” her abstract concludes.

However, she says this still does not rule out a luminous object. "It could be that it's a luminous object that went away somewhere, and it's hiding somewhere in the galaxy," she said.

Bocana’s research is still in the early stages. She is yet to publish her findings in a peer-reviewed journal—however, LiveScience reports her presentation was welcomed by attendees.

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Boy, 5, recovering in hospital after getting trapped in hole in Shannon, Co Clare.
Three units of the fire brigade from Shannon Town attended the scene which was just a few hundred metres from their base and close to the local Garda station. © Getty On arrival, fire service personnel could only see the child’s head and shoulders above the ground. They erected a protective screen around the scene so they could assess the situation and decide how best to release the boy. Fire crews used shovels to dig earth from around the pipe and were then able to remove the pipe in sections.

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