Institute of Astronomy

Splashback as a physical boundary of galaxy halos: theoretical predictions, observational detections, and implications for galaxy evolution

SpeakerTalk DateTalk Series
Andrey Kravtsov (U.Chicago and IoA)16 November 2018Institute of Astronomy Galaxies Discussion Group


Theoretical models of simple spherical collapse predict that dynamics of matter during collapse of dark matter halos gives rise to sharp features - “edges” - in radial density profiles of matter. I will show that such sharp edges are detectable around real LCDM halos despite the added complexities of their collapse and will argue that these edges are a natural physical boundary of halos. I will discuss their recent observational detections around real galaxy clusters and will show some examples of how splashback feature in matter and galaxy distribution can help with interpretation of galaxy evolution and dynamics.


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