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Looking for a dark matter needle in an X-ray stack

12 Feb 2019, 11:30 UTC
Looking for a dark matter needle in an X-ray stack
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Title: Detection of an unidentified emission line in the stacked X-ray spectrum of galaxy clustersAuthors: Esra Bulbul, Maxim Markevitch, Adam Foster, Randall K. Smith, Michael Loewenstein, Scott W. RandallFirst author’s institution: Harvard-Smithsonian Centre for AstrophysicsStatus: Published in The Astrophysical Journal, available on arXivDark matter is frustratingly elusive. Despite the wealth of indirect astronomical evidence for its existence, dark matter has continued to escape direct detection. To date, teams of particle physicists have not yet been able to trap a dark matter particle in laboratory experiments based on the properties predicted from leading theories.Indirect searches for dark matter rely on finding “signatures” that inform us as to its existence. These searches look for visible products of dark matter interactions, based on the vast amount we know to be present all around us in the cosmos.Particle dark matter can leave high energy imprints such as gamma-ray photons or energetic charged particles, known as cosmic rays. Gamma-ray excesses due to dark matter are being investigated by the Fermi Gamma Ray Space Telescope, while cosmic rays are being probed with the Dark Matter Particle Explorer (DAMPE) satellite.One exciting example of an indirect dark matter search has come from searching the sky in the X-ray ...

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