Astronomers Confirm the Existence of a Second Galaxy without the Presence of Dark Matter


A year ago, researchers from Yale University announced the disclosure of a galaxy with almost no dark matter, a finding that was received with both intrigue and wariness. Presently, follow-up research keeps on showing the strange absence of dark matter and has found another galaxy with comparative qualities. 

NGC 1052-DF2, or simply DF2, was discovered using the Dragonfly Telephoto Array, a tool devoted to discovering especially blackout objects. Also, that is essential! DF2 is an ultra-diffuse cosmic system, as huge as the Milky Way yet with 100 to 1000 fewer stars. 

To quantify the mass of a cosmic system, for example, this, the group tracked how clusters of stars move within the galaxy. In view of how they move, they can figure out the amount of matter present in it. The most recent estimations, as announced in The Astrophysical Journal Letters, were accomplished by making use of the Keck Cosmic Web Imager on the W. M. Keck Observatory. With the Keck, Cosmic Web Imager, they acquired an exact speed for the clusters of stars in DF2. A speed reliable with a cosmic system having only the matter we can see, and without the presence of any dark matter. This affirmed what they discovered a year ago. 

“The fact that we’re observing something that is simply totally new is what’s so captivating,” Shany Danieli, lead author, and researcher who discovered the galaxy around two years prior said in an announcement. “Nobody even knew that such cosmic systems existed, and the best thing on the planet for a student of astronomy is to find an object, regardless of whether it’s a planet, a star, or a cosmic system, that nobody thought about or even contemplated.”

On the other hand, a second study published in The Astrophysical Journal Letters confirmed the existence of NGC 1052-DF4, or simply DF4. DF4 lies in the same group of cosmic systems from DF2 and is an ultra-diffuse galaxy. This demonstrates DF2 isn’t a confined case. 

“Finding a second world with almost no dark matter is similarly as intriguing as the underlying discovery of DF2,” lead author of the DF4 paper, Prof. Pieter van Dokkum, said in an announcement. “This implies the odds of discovering more of these cosmic systems are currently higher than we previously suspected.” 

These discoveries have imperative ramifications for cosmological theories. It emphatically suggests that dark matter is without a doubt a substance, although we are unaware of its exact properties. 

The team of researchers will currently search for more candidates making use of the Dragonfly Telephoto Array before following up their perceptions using the Keck telescope.

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