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  • Quasars illuminate swiftly swirling clouds around galaxies

    Invisible gas clouds in galaxies absorb light from background quasars based on the clouds' physical properties.  By searching for changes in absorption from repeat observations of the same quasar, University of Illinois astronomers found the first evidence that small-scale gas clouds are likely to exist. .

    Invisible gas clouds in galaxies absorb light from background quasars based on the clouds' physical properties. By searching for changes in absorption from repeat observations of the same quasar, University of Illinois astronomers found the first evidence that small-scale gas clouds are likely to exist. .

    Graphic by John Webb

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      Invisible gas clouds in galaxies absorb light from background quasars based on the clouds' physical properties. By searching for changes in absorption from repeat observations of the same quasar, University of Illinois astronomers found the first evidence that small-scale gas clouds are likely to exist. .

      Graphic by John Webb

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  • To contact Robert J. Brunner, call 217-244-6099; email bigdog@illinois.edu.

    The paper, “Narrow absorption line variability in repeat quasar observations from the Sloan Digital Sky Survey,” is available online.