Testing the two planes of satellites in the Centaurus Group
Oliver M\"uller, Helmut Jerjen, Marcel S. Pawlowski, Bruno Binggeli

TL;DR
This study investigates the distribution of satellite galaxies in the Centaurus Group, testing the existence of two parallel planes and finding evidence that suggests a single dominant plane aligned with Cen A, challenging previous bimodal claims.
Contribution
The paper combines new dwarf galaxy data with existing samples to statistically assess the satellite galaxy distribution, providing evidence for a single plane rather than two parallel planes.
Findings
Support for a bimodal galaxy distribution with previous data
Inclusion of new data reduces bimodality significance
Evidence for a single dominant satellite plane around Cen A
Abstract
The existence of satellite galaxy planes poses a major challenge for the standard picture of structure formation with non-baryonic dark matter. Recently Tully et al. (2015) reported the discovery of two almost parallel planes in the nearby Cen A group using mostly high-mass galaxies (M -10 mag) in their analysis. Our team detected a large number of new group member candidates in the Cen A group (M\"uller et al. 2016). This dwarf galaxy sample combined with other recent results from the literature enables us to test the galaxy distribution in the direction of the Cen A group and to determine the statistical significance of the geometric alignment. Taking advantage of the fact that the two galaxy planes lie almost edge-on along the line of sight, the newly found 13 group members by Crnojevic et al. (2014, 2016) and our 16 new Cen A group candidates (M\"uller et al. 2016) can be…
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