Published: Fri, March 30, 2018
Research | By Clarence Powell

This Galaxy Doesn't Have Dark Matter, and That's Weird

This Galaxy Doesn't Have Dark Matter, and That's Weird

" It stood apart to us as a result of the exceptional comparison in between its look in Dragonfly photos and also Sloan Digital Sky Survey information", the writers of the paper explaining the item create.

With spectral data from Keck, van Dokkum's team found clusters of stars were moving much slower than expected, which indicates less mass in a system.

Dark matter, which is invisible, is thought to comprise about a quarter of the universe's combined mass and energy and about 80 percent of its total mass, but has not been directly observed. It's as if the universe is playing a trick on us by flipping the laws of physics on their head - dark matter should be there, but it isn't. "Dark matter accumulates; ordinary gas falls into it; it turns into stars, and then you get a galaxy", says astrophysicist Jeremiah Ostriker of Columbia University, who was not involved in the work.

NGC 1052-DF2 resides about 65 million light-years away in the NGC 1052 Group, which is dominated by a massive elliptical galaxy called NGC 1052. Previously, the team took a look at other galaxies with similar properties and the same class as NGC-1052-DF2, discovering that they nearly entirely consisted of dark matter.

DF2 was first spotted with the Dragonfly Telephoto Array, a powerful telescope built by experts from the University of Toronto and Yale University. The object which has been scientifically named as NGC1052-DF2 seems to have no dark matter at all in its vicinity.

"NASA's Hubble Space Telescope took an image of a weird, ghostly looking galaxy called NGC 1052-DF2 that astronomers calculate to have little to no dark matter". But dark matter was the majority. While NGC 1052-DF2 appears to have no dark matter, Dragonfly 44 seems to have much more dark matter relative to visible matter than astronomers expect.

This infrared image shows hundreds of thousands of stars crowded into the swirling core of the Milky Way galaxy.

Scientists have discovered a galaxy with nearly no dark matter. They only know dark matter does exist everywhere and has its own gravitational pull.

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But that doesn't mean the results in this paper provide flawless support for dark matter theories either. Some physicists have postulated that there is no such thing as dark matter, however, and that what we perceive as giant, starlight-bending clumps of heavy, invisible material is actually something else that is profoundly misunderstood.

These ideas, however, still do not explain how this galaxy formed.

"Basically, it was the seed for drawing in normal matter", Bauer told Live Science.

Astronomers first discovered the galaxy in 2000 as a smudge on old photographic plates. Scientists have yet to be able to directly observe dark matter.

More work has to be done by the team which is conducting this research and after that, the actual occurrence of the galaxy and the non-occurrence of the dark matter will be proved. When van Dokkum and his team found NGC 1052-DF2, they expected to see something similar. Sure, MOND doesn't easily explain a galaxy behaving as if there is no missing mass. Bullock thinks that as the dark matter particles reached the extremes of their orbits, forces from the neighboring galaxy could have ripped them away.

"I don't find that [point of view] at all compelling", Bauer said.

The galaxy was studied by many telescopes (Jemini and Kek Hawaii, Space Hubble, etc.) to cross-check the results. For example, they can look at how fast stars cruise around a galaxy. We don't see any indication of these effects, so modified gravity ideas must be wrong.

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