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Through the Lens: Milky Matter Magnifies Magellanic Motion

22 Feb 2020, 14:00 UTC
Through the Lens: Milky Matter Magnifies Magellanic Motion
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Title: First Results on Dark Matter Substructure from Astrometric Weak LensingAuthors: Cristina Mondino, Anna-Maria Taki, Ken Van Tilburg, and Neal WeinerFirst Author’s Institution: Center for Cosmology and Particle Physics, Department of Physics, New York University, New York, NY 10003, USAStatus: pre-published on arXivThere is about five times more invisible “dark matter” than its luminous counterpart in the universe—but how do we go about detecting something that can’t be directly imaged? One way is to look for the gravitational effects of dark matter clumps on images of normal matter along the same line of sight. This type of effect is called gravitational lensing. In today’s paper, the authors specifically look for the effects of weak lensing from low-mass structures consisting entirely of dark matter. The foreground dark matter structure creates a lens that bends the light coming towards an observer from some background luminous source. Unlike strong lensing, weak lensing doesn’t impact a single background source, but instead serves to preferentially align several background sources along some field. For more information on different types of lensing and how they work, check out this bite.
Why Use Weak Lensing?Alignments of foreground and background sources that lead to weak lensing are much more ...

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