A whirling plane of satellite galaxies around Centaurus A challenges cold dark matter cosmology

Müller, Oliver and Pawlowski, Marcel and Jerjen, Helmut and Lelli, Federico. (2018) A whirling plane of satellite galaxies around Centaurus A challenges cold dark matter cosmology. Science, 359 (6375). pp. 534-537.

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Official URL: https://edoc.unibas.ch/67593/

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The Milky Way and Andromeda galaxy are each surrounded by a thin plane of satellite galaxies that may be corotating. Cosmological simulations predict that most satellite galaxy systems are close to isotropic with random motions, so those two well-studied systems are often interpreted as rare statistical outliers. We test this assumption using the kinematics of satellite galaxies around the Centaurus A galaxy. Our statistical analysis reveals evidence for corotation in a narrow plane: of the 16 Centaurus A's satellites with kinematic data, 14 follow a coherent velocity pattern aligned with the long axis of their spatial distribution. In standard cosmology simulations, < 0.5% of Centaurus A-like systems show such behavior. Corotating satellite systems may be common in the Universe, challenging small-scale structure formation in the prevailing cosmological paradigm.
Faculties and Departments:05 Faculty of Science > Departement Physik
UniBasel Contributors:Müller, Oliver
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Association for the Advancement of Science
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:09 Apr 2019 10:04
Deposited On:09 Apr 2019 10:04

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