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Could This Be The Signal Of Dark Matter? Unsure Scientists Checking This Out

Sometimes a strange signal comes from the dark and it takes a while to figure out what that signal means. In this case, scientists analyzing high-energy gamma rays emanating from the galaxy’s center found an unexplained source of emission that they say is “consistent with some forms of dark matter.”

The data came courtesy of NASA’s Fermi Gamma-ray Space Telescope and was analyzed by a group of independent scientists. They found that by removing all known sources of gamma rays, they were left with gamma-ray emissions that so far, they cannot explain. More observations will be needed to characterize these emissions, they cautioned.

Scientists aren’t even sure what dark matter (which can only be detected through gravitational effects) is made of. One theoretical candidate could be something called Weakly Interacting Massive Particles (WIMPs), which could produce gamma rays in ranges that Fermi could detect.

Also, the location of the radiation at the galaxy’s center is an interesting spot, since scientists believe that’s where dark matter would lurk since the insofar invisible substance would be the base of normal structures like galaxies.

“The new maps allow us to analyze the excess and test whether more conventional explanations, such as the presence of undiscovered pulsars or cosmic-ray collisions on gas clouds, can account for it,” stated Dan Hooper, an astrophysicist at Fermilab and lead author of the study.

“The signal we find cannot be explained by currently proposed alternatives and is in close agreement with the predictions of very simple dark matter models.”

An intriguing signal could be due to "dark matter annihilations" pops up on the left of this data gathered by NASA's Fermi Gamma-ray Space Telescope. The image on left shows the galactic center in gamma rays with energies between 1 and 3.16 GeV. Red indicates the most activity, and the labels are for pulsars. The image at right has all these gamma-ray sources removed. Credit: T. Linden, Univ. of Chicago

An intriguing signal could be due to “dark matter annihilations” pops up on the left of this data gathered by NASA’s Fermi Gamma-ray Space Telescope. The image on left shows the galactic center in gamma rays with energies between 1 and 3.16 GeV. Red indicates the most activity, and the labels are for pulsars. The image at right has all known gamma-ray sources removed. Credit: T. Linden, Univ. of Chicago

The scientists suggest that if WIMPs were destroying each other, this would be “a remarkable fit” for a dark matter signal. They again caution, though, that there could be other explanations for the phenomenon.

“Dark matter in this mass range can be probed by direct detection and by the Large Hadron Collider (LHC), so if this is dark matter, we’re already learning about its interactions from the lack of detection so far,” stated co-author Tracy Slatyer, a theoretical physicist at the Massachusetts Institute of Technology.

“This is a very exciting signal, and while the case is not yet closed, in the future we might well look back and say this was where we saw dark matter annihilation for the first time.”

You can read more about the research in Physical Review D or in preprint form on Arxiv.

Source: NASA

About 

Elizabeth Howell is the senior writer at Universe Today. She also works for Space.com, Space Exploration Network, the NASA Lunar Science Institute, NASA Astrobiology Magazine and LiveScience, among others. Career highlights include watching three shuttle launches, and going on a two-week simulated Mars expedition in rural Utah. You can follow her on Twitter @howellspace or contact her at her website.

Comments on this entry are closed.

  • sgde3a April 5, 2014, 2:29 AM

    Weakly Interacting Massive Particles/WIMPS … as in Meekly interacting grounded people who are as big as a “topline” chain-of-command/order personnel, but who choose to get on with their life and not influence other particles but by their gravity and weight/truth of what they say? Thats darkness?

    The scientists suggest that if WIMPs were destroying each other, this would be “a remarkable fit”.

  • fractal April 5, 2014, 7:41 PM

    Hold on, this detected radiation is not from the center of our galaxy. In the Phys. Review article, I read that the observations are of 25 dwarf spheroidal satellite galaxies around the milky way. Those are ‘some of the most dark matter dominated objects known’.
    I suppose the gamma rays are supposed to be produced in WIMP-AntiWIMP collisions?

    • gopher65 April 6, 2014, 9:47 AM

      IIRC WIMPs are their own antiparticle. Not sure how that works, but they self-annihilate. Weird.

      • fractal April 6, 2014, 4:19 PM

        Interesting.
        Here is the article about the milky way’s center: http://arxiv.org/pdf/1402.6703v1.pdf
        They mention WIMP annihilation to quarks or to tau leptons.
        The links that Elizabeth put below her article lead to an other related paper.

  • Gunn Qznetsov April 5, 2014, 11:41 PM

    Dark Matter and Dark Energy are Mirage
    http://arxiv.org/pdf/1004.4496

    • mewo April 6, 2014, 8:34 AM

      Sorry, but that paper makes no sense whatsoever.

  • SteveZodiac April 6, 2014, 9:19 AM

    I’d be interested to know how they removed the gamma ray source Sag. A* from the picture. Was it by assuming that we know all there is to know about the radiation from a super massive black hole?

  • wreckhur April 6, 2014, 11:00 PM

    Negative energy.

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