Galaxy With No Dark Matter Baffles Astronomers

Rosemary Collier
April 1, 2018

You can't get one without the other. Then, after long observations through telescopes like Hubble and Hawaii's Gemini and W.M. Keck observatories, the researchers found that the galaxy behaves exactly the way our laws of physics predict it should - without the need for dark matter corrections.

Also, it is generally accepted that galaxies first formed from concentrations of dark matter that act like "galaxy starters".

"This invisible, mysterious substance is the most dominant aspect of any galaxy", added Pieter van Dokkum, Yale's Sol Goldman Family Professor of Astronomy, and lead author of the paper, in a statement. Will they find more of these dark matter deficient galaxies? If NGC1052-DF2 turns out to have no dark matter, it would be the first galaxy of its kind ever discovered. What's more, shockingly, it's about a similar measure of mass they'd hope to see from the galaxy's stars. But DF2 may as well be called F-U, because that's what it's saying to scientists who thought they understood galaxies, dark matter, and really anything about our universe.

Closer monitorings utilizing the Hubble and also 10-meter Keck telescopes revealed that the item, now described NGC1052- DF2, belonged to a lately uncovered course of things called ultra-diffuse galaxies.

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In other words, the question arises: if a galaxy did not start from dark matter, which then gravitationally attracted common matter, how did it form?

Without dark matter, there's very little connecting the galaxy together, making it look faint like this oddball NGC 1052-DF2. It's name is NGC 1052-DF2.

The astronomers measured the speeds of 10 bright globular clusters within the galaxy to calculate how much dark matter there was.

Here, "the absence of dark matter is evidence of its existence", van Dokkum says. By looking at the dynamical properties of ten globular clusters - essentially, a very large ball of stars - orbiting the galaxy, it allowed the team to work out an independent value of the galaxies mass. Gemini revealed that the galaxy does not show signs of an interaction with another galaxy. "I spent an hour just staring at the Hubble image", van Dokkum said. "Something like this has never been seen". Unlike typical spiral galaxies, DF2 has no dense, central region; nor spiral arms or a disk. "It is literally a see-through galaxy". This is a ghostly galaxy.

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The scientists recommend that the somewhat-odd look of the globular collections is possibly associated with the galaxy's unforeseen buildings, and also they introduced they're dealing with a paper that will certainly explain those. Because those intelligent beings of a universe that's 20 billion or so years old can never see what we observed and verified, it will not exist. To modern astrophysicists, galaxies are more notable for their dark sides: their hidden material that is only "seen" by its gravitational pull upon the shiny stuff it seems to vastly outweigh. "There is no theory that predicted these types of galaxies". But how it formed is a complete mystery.

In reality, for all that science knows today, the main component of a galaxy is neither its dust, nor its gas, nor even its myriads of stars, all things made of ordinary matter called baryonic, the one we all know.

But the researchers do have some ideas. The ones in NGC 1052-DF2 are mysterious in and of themselves: Many are comparable in brightness to Omega Centauri, the single brightest globular cluster in the Milky Way. If it has no dark matter, how did it even evolve into a galaxy? He said he wants to see whether researchers who model how galaxies form can come up with models that account for NGC 1052-DF2. The formation of NGC 1052-DF2 may have been helped by powerful winds emanating from the young black hole that was growing in the center of NGC 1052. Did a cataclysmic event such as the birth of a multitude of massive stars sweep out all the gas and dark matter? The stars only take shape on top of the dark matter that is already there. They can't agree on what it's made of, how much a single particle weighs, or the best way to construct a Play-Doh diorama of it.

"We thought that every galaxy had dark matter and that dark matter is how a galaxy begins". Had there been dark matter, the clusters would be moving slower or faster.

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