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Astrophysics Luncheon Seminar

The Planes of Satellite Galaxies Problem of ΛCDM Cosmology
Presented by Marcel Pawlowski
University of California, Irvine

Monday, May 7, 2018
12:00 noon in 169-336

Both the Milky Way and the Andromeda galaxy are known to host highly flattened planes of satellite galaxies. These display coherent kinematics, which is consistent with many of their satellite galaxies co-orbiting along the structures. In addition, we recently discovered that a similar satellite structure around Centaurus A also shows coherent kinematics, constituting the third such system studied in detail and the first clear evidence of a plane of satellites outside the Local Group. I will discuss the observational evidence for these structures, how they compare to expectations derived from cosmological simulations based on the ΛCDM model, whether there is evidence that the inclusion of baryonic processes in simulations can alleviate the existing tension, and why all suggested scenarios for their formation are currently unable to solve the issue.

JPL Contacts: Daniel Lenz or Eric Huff

About the Speaker
Marcel's work focuses on systems of satellite galaxies, in particular the detailed comparison of observed phase-space correlations among satellites in the Local Group and beyond with expectations derived from cosmological simulations. He received a PhD in Astronomy/Astrophysics from the University of Bonn, Germany in 2013. This was followed by a three-year postdoctoral position at Case Western Reserve University in Cleveland, OH. Since 2016, he is a Hubble Fellow at the University of California, Irvine.

SVCP Astrophysics

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