Researchers find a galaxy without dark matter

Astronomers perplexed to find that distant galaxy has no dark matter

Now researchers are pondering possible explanations for this missing dark matter in NGC 1052-DF2. But, recently, astronomers have made an unexpected discovery: a galaxy that has virtually no dark matter. A few of them seem typical galaxies that were removed of the majority of their celebrities as well as gas by communications with various other participants of the collection, leaving them extremely dark-matter abundant.

Roughly 65 million light-years away from Earth is a galaxy called NGC 1052-DF2 (DF2 for short). "It's so rare, particularly these days after so many years of Hubble, that you get an image of something and say, 'I've never seen that before.' This thing is astonishing, a big blob that you can look through. It is literally a see-through galaxy", he added.

Van Dokkum and his colleagues used the Dragonfly Telephoto Array to track the motion of 10 known star clusters to determine how massive the galaxy is. Some of them appear to be normal galaxies that were stripped of most of their stars and gas by interactions with other members of the cluster, leaving them incredibly dark-matter rich.

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"Dark matter is not something that galaxies can sort of swap in or out of, like it's kind of an optional thing that galaxies sometimes have and sometimes don't", van Dokkum said. Notably, most of the galaxies are believed to be comprised of more dark matter than regular matter. However you wouldn't expect that galaxy to be as big as this object (it's nearly the size of the Milky Way), and you'd also expect to see some other remnants around from the merger event.

The absence of dark matter from a small patch of sky might appear to be a non-problem, given that astronomers have never directly observed dark matter anywhere.

The first anomalies discovered were galaxies nearly entirely composed of dark matter. NGC 1052-DF2 is considered to be some 10 billion years old.

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This is weird-and it could change what astrophysicists think dark matter is, in addition to upending their understanding of how galaxies form, says van Dokkum. One suggestion is that the gas obtained focused as it was being expelled from a galaxy merging; an additional is that it created from issue gushed out by quasars.

Each of these would certainly have to be analyzed in information to identify if it can develop the distinctive attributes of NGC1052- DF2.

Dark matter's existence is inferred from the motion of objects affected by its gravitational pull. NGC1052-DF2 does reside in a region where such things could conceivably occur, lying near a giant elliptical galaxy with a supermassive black hole at its heart. But how it formed is a complete mystery. The gas crunched together in balls, lit up as stars, and formed planets and galaxies. Imaging them enabled the research study group to establish their activities orbiting the galaxy, which could, consequently, give an action of the quantity of mass that is associated with maintaining the things in position. Usllay galaxies have a larger mass than can be accounted for just by the ordinary matter inside them.

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So what if the assumptions about dark matter are wrong? The image also served as a confirmation that galaxies are interconnected through a cosmic web of dark matter. The leading dark matter theory predicts that this "sea" of particles moves around a galaxy in deep, plunging orbits like comets around the sun. The scientist says that if dark matter is a real substance that it can be present or not separately from regular matter in the universe.

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