Astronomers Find Galaxy with Almost No Dark Matter

30 March, 2018, 00:43 | Author: Carmen Reese
  • 3_28_Milky Way

Hubble helped to accurately confirm the distance of NGC 1052-DF2 to be 65 million light-years and determined its size and brightness.

Astronomers have discovered something odd and unique out in the universe - a galaxy with virtually no dark matter - and perhaps even stranger still, this discovery offers up a validation that dark matter actually exists! The answer calls back to why scientists thought galaxies needed dark matter to form: dark matter serves as a "scaffolding" for early galaxies, slowly accumulating as other visible matter like stars and gasses cluster around it. A Yale-led research team made the discovery while peering at the distant galaxy NGC 1052-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'".

Van Dokkum said NGC1052-DF2 is so sparse that "it is literally a see-through galaxy". Previously, van Dokkum, Abraham and their collaborators used the array to discover a new class of galaxies known as Ultra-Diffuse Galaxies (UDG).

Even though the galaxy is mostly empty, they found clusters of densely grouped stars.

"Finding a galaxy without dark matter is an oxymoron", says van Dokkum. The galaxy is on one end of two extremes, the other anchored by Dragonfly 44, another unusual galaxy discovered by the same team in 2016.

Paradoxically, the discovery of a galaxy without dark matter may actually confirm that the stuff actually exists by contradicting hypotheses advanced by dark matter doubters. "There is no theory that predicts these types of galaxies - how you actually go about forming one of these things is completely unknown", says co-author Allison Merritt from Yale University.

More news: Volkswagen Atlas Cross Sport SUV concept unveiled

Is this the end for dark matter? "So then, if you find a galaxy that appears not to have dark matter, you have to ask, 'How was it formed?'" It challenges the standard ideas of how we think galaxies work, and it shows that dark matter is real. And 10 objects isn't always enough to accurately measure a galaxy's movement."When more data are obtained, sometimes this [amount] proves to have been enough, but sometimes it proves to have been inadequate". When van Dokkum and his team found NGC 1052-DF2, they expected to see something similar.

Dark matter's existence is inferred from its gravitational influence on visible objects, which suggests it dominates over ordinary matter by a ratio of 5:1. By measuring their motions, the astronomers could calculate the mass of material enclosed inside their orbits. The galaxy is a complete mystery, as everything about it is odd.

The team's results will appear in the March 29, 2018, issue of the journal Nature.

The researchers describe the galaxy as looking like "a diffuse blob sprinkled with very compact star clusters". 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.

Speculative explanations include that a collision or cataclysmic event within the galaxy resulted in all the dark matter being swept away. The image also served as a confirmation that galaxies are interconnected through a cosmic web of dark matter. The object which has been scientifically named as NGC1052-DF2 seems to have no dark matter at all in its vicinity. But the dark matter floated in clumps. Thus, this leaves no speculative room for the existence of dark matter. NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope.

Recommended:

  • 100000 people to turn out for Prince Harry's wedding

    100000 people to turn out for Prince Harry's wedding

    Prince Harry and Markle are to marry at St George's Chapel, within the grounds of Queen Elizabeth II's Windsor Castle residence. Dogs and mounted officers will also be on patrol and marine officers will be conducting searches along the nearby Thames river.
    Donald Trump Takes Another Shot at Amazon and Jeff Bezos

    Donald Trump Takes Another Shot at Amazon and Jeff Bezos

    And he hasn't been shy about his disgust for the Washington Post , the newspaper owned separately by Amazon CEO Jeff Bezos . Kristi Noem, a South Dakota Republican, has called for legislation requiring online retailers to collect sales tax .
    Sarah Jessica Parker talks Cynthia Nixon's run for governor of NY

    Sarah Jessica Parker talks Cynthia Nixon's run for governor of NY

    After being called an unqualified lesbian by an aid of Governor Andrew Cuomo , actress Cynthia Nixon dismissed the comment. Cuomo is fighting for $550 million in state funding for the New York City Housing Authority.
  • Watch out for the Easter Bunny at Sundridge tree farm annual hunt

    Watch out for the Easter Bunny at Sundridge tree farm annual hunt

    There will be many different prizes including three bikes donated by the Taber Kinsmen Club, one for each division of egg hunters. Participants can also enter a drawing for a giant stuffed bunny that will be given away by Lake Oswego Mayor Kent Studebaker.
    GoPro Adds New Entry-Level $199 USD Hero Action Camera to Lineup

    GoPro Adds New Entry-Level $199 USD Hero Action Camera to Lineup

    The question is whether it will be enough to revive the fortunes of a company that has endured a tough few years. The $200 HERO becomes the most budget-friendly camera in the GoPro lineup, joining the $300 HERO5 and $400 HERO6.
    Uber self-driving auto  death riddle: Was LIDAR blind spot to blame?

    Uber self-driving auto death riddle: Was LIDAR blind spot to blame?

    At the time, though, the governor failed to mention that Uber had been secretly testing such vehicles in the state since August. He said the Uber accident will not impact Baidu's autonomous driving development plans.
  • Egyptian President Abdel Fattah al-Sisi re-elected with almost  92% of votes

    Egyptian President Abdel Fattah al-Sisi re-elected with almost 92% of votes

    The official results are not going to be made public until next April 2, according to forecasts of National Electoral Commission. In the 2012 election, which witnessed heightened competition between Islamists and opponents, turnout reached 52 percent.
    Terry Myerson is no longer with Microsoft

    Terry Myerson is no longer with Microsoft

    This team will continue to build first-party products and the core building block cloud services for third parties on Azure. Eric and team will take guidance on all AI-related areas from Harry Shum and work very closely with AI+R.
    Malala Yousafzai on emotional return to Pakistan

    Malala Yousafzai on emotional return to Pakistan

    She was later honoured by Prime Minister Shahid Khaqan Abbasi at a special ceremony at his residence. He also referred to the militants who wounded Yousafzai and the battle Pakistan is still fighting.
  • Facebook scandal stirs privacy concerns for millions of users

    Facebook scandal stirs privacy concerns for millions of users

    The crisis also threatens the Silicon Valley tech industry whose business model revolves around data collected on Internet users. This allows users to delete content from their Facebook as they see fit, even old posts they've published to their Timeline.
    SoftBank builds world's largest solar power plant

    SoftBank builds world's largest solar power plant

    It is said that SoftBank aims to invest 15 billion Dollars in a new city, Neom, which the Prince plans to build on the Red Sea. The sale of about a 5 per cent stake in oil giant Saudi Arabian Oil Co is expected to provide more funds.
    Scattered snow and rain showers today

    Scattered snow and rain showers today

    This will allow our temperatures to get around 60F, which is much cooler than where we should be for this time of the year. Scattered showers will continue around western Montana this morning, then begin to move out by late morning and afternoon.


Popular

Harry Kane Not Ruled Out with Ankle Injury for Chelsea vs
Kane is now second on 24 goals, four behind Egypt and Liverpool's Mohamed Salah , in the Premier League top scorers chart. Arsenal and Chelsea always are tough games, because they are derbies, and for me it is a similar type of opponent.

TL;DR: SRH haven't made decision on Warner yet: Saha
New Balance, which sponsors Steve Smith but not the Australian cricket team, would not comment on Wednesday. Warner along with skipper Smith may be slapped with a one-year ban by Cricket Australia.

Leaders Of North, South Korea To Meet April 27th
The announcement comes a day after news emerged of discussions between Mr Kim and Chinese President Xi Jinping . Trump welcomed the meeting between Kim and Xi, while calling for continued pressure against the isolated regime.

Your Easter weather for Sussex
A further yellow warning for heavy snow has been issued for southern Scotland between 12.15am and 11.45pm on Easter Monday . Much of the areas have a chance of a rain/snow mix, with about 1 to 3 inches of snow by early Saturday in much of the area.

Govt kicks off process to sell 76% stake in Air India
Air India began using the new route on March 22, reducing flight times between the two cities by more than two hours. According to the PIM, Air India has 16,834 employees as on December 1, 2017 of which 11,214 are permanent employees.

Huawei unveils P20, P20 Pro, Mate RS and FreeBuds
Huawei has unveiled two new smartphones, the P20 and P20 Pro , which will be made available in Malaysia next week. With all these, we get a 3,400 mAh battery and support for Huawei Super Charge technology as well.

Brighter, warmer today, rain chances tonight
This will allow our temperatures to get around 60F, which is much cooler than where we should be for this time of the year. The forecast for Opening Day at Comerica Park on Thursday against the Pittsburgh Pirates comes with good and bad news.

Huawei's P20 is a shiny, extravagant phone
That is paired with a 767MHz Mali-G72 MP12 GPU , 6GB of RAM , a generous 128GB of storage, and a 4000mAh battery in the P20 Pro . Breaking that down, it's 24MP for the front-facing camera, 8MP for the telephoto, 40MP for the RGB, and 20MP for the monochrome.

Memorial for French terror attack victims
One of the officers was shot in the shoulder but the injury is not life-threatening, a police spokesman told the news service. The man first hijacked a vehicle in Carcassonne, killing a passenger and injuring the driver, before shooting a policeman.

Markets Right Now: Tech, bank stocks lead U.S. indexes higher
ENERGY: Benchmark U.S. crude added 17 cents to $65.72 a barrel in electronic trading on the New York Mercantile Exchange. Microsoft was the biggest gainer in the 30-company Dow and the Standard & Poor's 500 index , climbing almost 8 percent.