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STScI Webcast

2015 Fall Science Colloquia

The Substructure of Dark Matter Halos Revisited

Presented by: Frank van den Bosch (Yale University)
Category: Science Colloquia   Duration: 1 hour   Broadcast date: September 30, 2015
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The Cold Dark Matter paradigm predicts that dark matter haloes are abound with substructure. A detailed characterization of dark matter subhalos is important for understanding the evolution of satellite galaxies, for modeling time-delays and flux-ratio anomalies in gravitational lensing, for boosting the dark matter annihilation signal and for the survivability of fragile structures such as streams and disks. I discuss the abundance and evolution of dark matter subhalos based on a new analytical model, use the model to revisit the Too-Big-To-Fail problem, demonstrate important shortcomings in the studies of substructure based on numerical simulations, and present a comprehensive analysis of the segregation of dark matter subhalos within their host halos.