A whirling plane of satellite galaxies around Centaurus A challenges cold dark matter cosmology
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4492285
Author(s) Müller, Oliver; Pawlowski, Marcel; Jerjen, Helmut; Lelli, Federico
Author(s) at UniBasel Müller, Oliver
Year 2018
Title A whirling plane of satellite galaxies around Centaurus A challenges cold dark matter cosmology
Journal Science
Volume 359
Number 6375
Pages / Article-Number 534-+
Keywords large-scale structure; cosmology; dark matter; galaxies: dwarf; Centaurus A
Abstract 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.
Publisher American Association for the Advancement of Science
ISSN/ISBN 0036-8075 ; 1095-9203
URL http://science.sciencemag.org/content/359/6375/534
edoc-URL https://edoc.unibas.ch/67593/
Full Text on edoc Available
Digital Object Identifier DOI 10.1126/science.aao1858
PubMed ID http://www.ncbi.nlm.nih.gov/pubmed/29420285
ISI-Number 000423795800033
Document type (ISI) Article
 
   

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