Unique, oddball galaxy is strangely devoid of dark matter

30 March, 2018, 00:43 | Author: Myrtle Cook
  • Astronomers perplexed to find that distant galaxy has no dark matter

Scientists have been stunned by the discovery of a so-called "ghost galaxy" that appears to contain virtually no dark matter, once thought to be a key building block for galaxies. It challenges the standard ideas of how we think galaxies work, and it shows that dark matter is real.

Utilizing a group of lenses called the Dragonfly Telephoto Array, a team led by Yale University's Pieter van Dokkum investigated NGC1052-DF2. "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". That thinking led van Dokkum and his colleagues to build the Dragonfly Telephoto Array, a telescope in New Mexico created for the express objective of scrutinizing ultra-diffuse galaxies.

The team tracked the motions of 10 bright star clusters and found that they were travelling way below the velocities expected. But physicists contacted by Live Science to discuss this paper mostly said the finding made dark matter (already the dominant explanation for the universe's weirdness) look a lot more likely. That's when they realized that this galaxy was very, very different from other galaxies. 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. His stars are enough to explain his whole mass, and there seems to be no extra space for dark matter, "he added".

There have been several ideas that have floated around regarding the true nature of dark matter, and discoveries like this will only push astronomers to unlocking its secrets. So even among this unusual class of galaxy, NGC 1052-DF2 is an oddball. The researchers initially used Dragonfly to study a different galaxy, one appearing to possess an nearly inconceivably gargantuan amount of dark matter, which was a weird result in and of itself. "This result also suggests that there may be more than one way to form a galaxy".

More news: Senator McConnell and Commissioner Quarles Announce Hemp Legislation

Each of these would certainly have to be analyzed in information to identify if it can develop the distinctive attributes of NGC1052- DF2. The researchers then set about measuring the movements of the clusters as a way to estimate the galaxy's total mass.

Around 65 million light-years away, there's a galaxy which is called NGC1052-DF2 and which diminishes and diffuse. The galaxy is a complete mystery, as everything about it is odd. This would allow the gas to form stars away from clumps of dark matter. "In those theories, every galaxy should show a dark matter signature, as it's not due to dark matter at all but due to the laws of physics", van Dokkum explained. Stars and clusters in the outskirts of galaxies containing dark matter move at least three times faster. Had there been dark matter, the clusters would be moving slower or faster.

Experts have described DF2 as "ghostly" as a result of its lack of dark matter and scant stars. 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.

About a year ago, University of Waterloo researchers captured a composite image that strongly supports the existence of dark matter. If dark matter were one of the unexplained effects of the gravity that differentiates it from regular matter, the effect of it would be visible in the galaxy. NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope.

Recommended:



Popular

Serial' Subject Adnan Syed Deserves A New Trial, Appeals Court Rules
In 2016 , a lower court judge vacated Syed's conviction and ruled that he deserved a new trial, reports CBS Baltimore . The attorney general's office could appeal Thursday's decision to the state's highest tribunal, the Court of Appeals.

Did Arizona governor keep Uber test drives a secret?
The fall-out from the accident could impede the research, development, and testing of self-driving vehicles. Uber's cars in Arizona "were struggling" before the accident, The Times reported .

Toyota names Zack Hicks head of new digital arm
Manoeuvrability has always been a virtue of the RAV4 and this has not been compromised in the new design. The 2019 Toyota RAV4 will arrive at the end of 2018, while the hybrid models will arrive in early 2019.

Ride-hailing giant Uber selling up to Grab across Southeast Asia
Uber declined to comment and Grab , which has an estimated valuation of about US$6 billion (RM23.5 billion), declined to comment. Uber's South East Asian marketing team have been put on gardening leave following the company's acquisition by Grab .

Google Search Takes Another Big Step Towards a Mobile-First World
In addition, the company has an API that lets other companies-including Facebook and Twitter-use its platform to share GIFs. Within Messenger, when users hit the option to insert a GIF into their conversation, the data is pulled from Tenor .

Russian Mall Fire Kills at Least 64
Several people involved in the mall's operation, including the building's owner , have reportedly been detained for questioning. An 11-year-old boy was among those who jumped. "There were a lot of children, children without parents", said witness Klepova.

Nokia 1 Android Go Edition Launched in India
However, you will need to make sure that you activate your Kotak 811 account with a deposit of Rs.1,000 to receive the benefit. The Nokia 1 has been priced at Rs. 5,499 and will be available starting from March 28 in Warm Red and Dark Blue color options.

Texoma Idol victor advances on American Idol
A former " American Idol " contestant returned to audition as their drag queen persona on Sunday night's episode. She said her father was there for every audition and every performance through her budding music career.

Police Arrest Larry Nassar's Former Boss at Michigan State
The sexual assault charge is a high court misdemeanor, which means it carries a two-year maximum sentence. The Ingham County sheriff says William Strampel was taken into custody Monday.

U.S. destroyer sails close to contested island in South China Sea
In January, another US Navy destroyer sailed near Scarborough Shoal, a disputed lagoon claimed by China in the South China Sea. Navy destroyer USS Chafee also sailed close to the Paracels, provoking a stern reaction from the Chinese Defense Ministry.