Astronomers Find a Galaxy Without Dark Matter for the First Time

30 March, 2018, 00:45 | Author: Lucy Floyd
  • Astronomers baffled by distant galaxy that doesn't have any dark matter

The laws of motion and gravity tell us how fast these objects should turn given their bulk.

Working with the speeds at which these clusters of stars were moving, they were able to calculate the mass of DF2. It's coming in at around one two-hundredths the mass of our Milky Way. Based on these indirect observations, researchers have estimated that dark matter makes up about 27 percent of our universe.

However, this new study by astronomers using the NASA/ESA Hubble Space Telescope and several other observatories of a galaxy known as NGC 1052-DF2 that appears to have very little, if no dark matter al all, now challenges this currently-accepted theory. And that normalcy is deeply weird.

The scientists spotted NGC1052-DF2 using the Dragonfly Telephoto Array, a telescope in New Mexico. "Dark matter has been rolled into galaxy formation and evolution theories for decades now, but this discovery of a galaxy that seems dark-matter-free puts a damper on many of those theories".

Unfortunately, dark matter research is facing a hurdle, as the Trump administration's NASA budget proposal for fiscal year 2019 places the funding of the Wide-Field Infrared Survey Telescope in question.

For a galaxy like NGC1052-DF2, you'd expect to see about one hundred times more dark matter than visible matter-but astronomers found it has nearly no dark matter.

In other words, finding a galaxy without dark matter is pretty good evidence that dark matter is a real thing.

GOP-led states back Trump in California 'sanctuary' lawsuit
If Arizona's laws are overridden by federal law, then so are California's, the court filing for Texas and the other states said. Supervisor Michelle Steel , who introduced the resolution , delivered a statement explaining the measure.

Adding up the clusters' motions and NGC 1052-DF2's mass, they realized there might be no dark matter behind this particular galactic curtain. "This whole story is one of dark matter being the scaffolding on which every galaxy is built", said van Dokkum.

The universe's ordinary matter includes things like gas, stars, black holes and planets, not to mention shoes, umbrellas, platypuses and whatever else you might see on Earth. Given that there isn't a trace of the dark matter, data suggests that it's made entirely of normal matter. And over time, those clumps attracted the gas with their gravity. It may have been formed from gas interaction blowing out or into a larger galaxy. They do not know how it formed, but have some hypotheses, including the possibility that a cataclysm within NGC1052-DF2 swept away all its gas and dark matter or that a massive nearby galaxy played havoc with it.

While NGC 1052-DF2 doesn't break any fundamental rules of the dark matter theory, Bauer said the galaxy is surprising and unexpected enough to force astrophysicists to develop some new models of how galaxies come together. Sure, MOND doesn't easily explain a galaxy behaving as if there is no missing mass. Hubble helped them better identify the globular clusters and measure an accurate distance to the galaxy.

"I don't find that [point of view] at all compelling", Bauer said.

There are 200 billion observable galaxies, perhaps more, astronomers estimate.

The researchers describe the galaxy as looking like "a diffuse blob sprinkled with very compact star clusters". More recently, Verlinde suggested an alternative called "emergent gravity", in which gravity is a byproduct of quantum fluctuations and dark energy (another scarcely understood phenomenon, one that seems to be causing the universe's expansion to accelerate). "So, this is at the hairy edge of credible".

In the Milky Way there is about 30 times more dark matter than normal matter. What scientists know about it is that it's an elliptically shaped galaxy, which they have named NGC1052-DF2.

Recommended:

  • Trump Unusually Quiet As Rumors Swirl Around VA Chief Being Fired

    Trump Unusually Quiet As Rumors Swirl Around VA Chief Being Fired

    Shulkin joins a long list of senior officials who have either resigned or been fired since Trump took office in January 2017. Shulkin had drawn fire for a damning report from the inspector general of the Department of Veterans Affairs .
    Ecuador suspends Julian Assange's outside communication

    Ecuador suspends Julian Assange's outside communication

    Assange's internet access was also interrupted in 2016 after a WikiLeaks dump targeting Hillary Clinton's presidential campaign. Meanwhile, there's still an arrest warrant for him in Britain for jumping bail.
    Waymo to create luxury, self-driving electric auto  with Jaguar

    Waymo to create luxury, self-driving electric auto with Jaguar

    The tie-up is just the latest in a series of partnerships and integration pacts between Waymo and other automakers. The I-PACE will be able to travel 240 miles on a single charge and accelerate from 0-60 mph in under five seconds.
  • Uber agrees to sell Southeast Asia business to rival Grab

    Uber agrees to sell Southeast Asia business to rival Grab

    SoftBank is also one of the main investors in several of Uber's rivals, including Grab , China's Didi Chuxing , and India's Ola . New entrants and the strength of second-place regional players such as Lyft Inc.in the USA have complicated those efforts.
    India talks tough to China, says ready for any situation

    India talks tough to China, says ready for any situation

    Meanwhile, Defence Minister Nirmala Sitharaman had said on Sunday that India was "alert" and ready to deal with any "unforeseen situation" in Doklam.
    Hero officer married partner on death bed after France terror attack

    Hero officer married partner on death bed after France terror attack

    Heavily armed police also searched Lakdim's apartment in Carcassonne to search for clues as to his motives and weapon source. French President Emmanuel Macron and British Prime Minister Theresa May are among those who sent messages of condolence.
  • Family of victim involved in AV collision settles with Uber

    Family of victim involved in AV collision settles with Uber

    Uber had already taken its cars off the road. "We are proud to welcome innovation to Arizona", he said . The program doesn't also have as much real-world testing experience as its rivals do like Waymo.
    Google rolls out mobile-first indexing

    Google rolls out mobile-first indexing

    Tenor , a popular GIF platform with more users than Twitter , was acquired Tuesday for an undisclosed amount by Google . This acquisition will assist Google to add-up GIFs inside Google images and other services like Gboard more easily.
    Police won't face charges in Alton Sterling shooting case

    Police won't face charges in Alton Sterling shooting case

    Of those officers, 41 have not been convicted, majority acquitted by juries or during a bench trial, he said. Body camera and surveillance video haven't been released, but cellphone video of the encounter went viral.
  • Facebook revamps privacy tools; Allows you to download user data

    Facebook revamps privacy tools; Allows you to download user data

    Facebook announced today that it's making major changes to its settings menu and how you'll access your privacy settings. In addition to the redesigned security settings, the company is also adding two more tools to maintain a user's privacy.
    Air India Disinvestment Takes Off: 10 Things To Know

    Air India Disinvestment Takes Off: 10 Things To Know

    The relevance of 24 per cent of the share is that it doesn't give the government right to veto decisions, said Bhargava. El Al is asking that the Air India flights be halted until Israeli airlines are also allowed to fly over Saudi Arabia.
    Twitter announces a ban on cryptocurrency ads

    Twitter announces a ban on cryptocurrency ads

    The value of bitcoin dropped eight percent to $7929, after the Twitter ad ban was announced, based on market data from Bloomberg . This is the real asset of Twitter that the community is using and the ban on advertising is not in any way going to change that.


Popular

Egg-ceptional Kids: Event creates welcoming Easter atmosphere
There will be many different prizes including three bikes donated by the Taber Kinsmen Club, one for each division of egg hunters. Join us at the annual Spring Eggstravaganza event hoppening at Garfield Park on Saturday from 11:30 a.m. - 2:00 p.m.

Nobel Laureate Malala Yousafzai Returns to Pakistan
At just 11, Ms Yousafzai began writing an anonymous diary for BBC Urdu about her life under Taliban rule. "It is your home". She's using her trip to urge people in the country to join her campaign for girls' education and women's rights.

Fourth-largest jackpot in Mega Millions history up for grabs
The last time was in July 2016 when a single ticket sold in IN - in Hamilton County - won a $536 million prize. Friday's jackpot could rank as the fourth-highest in the history of Mega Millions.

Scattered snow and rain showers today
Given the clouds and less cold southeasterly breeze, expect a less cold night with lows likely remaining in the low to mid 30s. A cold front will slide through early Wednesday evening bringing a small chance of a few brief light showers or sprinkles.

Russian Mall Blaze Kills At Least 64 People, Including Children
Video shared online by Russian news outlets showed thick smoke rapidly filling the fourth floor as the fire began to spread. Kemerovo Regional Governor Aman Tuleyev has signed an order declaring mourning in the region from Tuesday to Thursday.

What Will John Bolton Mean For American Foreign Policy?
Bolton has maintained a pair of political committees, which he has used to funnel political support to hawkish candidates. The New York Times first reported Cambridge harnessed its Facebook data in services it provided the Bolton super PAC.

Nokia 1 with Android Go Edition for Rs 5499 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. Design wise, HMD Global rolls back the clock and takes inspiration from Nokia's storied past in the mobile phone space.

Giants coach expects Beckham to report for OTAs
I really don't think you can know somebody by seeing reports , reading reports, hearing what people think and say. Beckham is entering the final year of his rookie contract, making $8.5 million in his fifth-year option.

Arrest made in connection with suspicious packages at DC-area military bases
The FBI continues to advise the public to remain vigilant and not touch, move or handle any suspicious or unknown packages. Law enforcement is looking at more than 5 locations and the Federal Bureau of Investigation has 1 suspect in their sights.

Spring Snow Storm 3-26-18
Weekend high temperatures will likely top out in the mid 50s both days, which is close to average for late March into early April. Highs will range from the mid 40s in North Jersey and along the Jersey Shore, to near 50 degrees for interior South Jersey.