2016 - 2017 Astro Seminar Schedule

DateEvent TypeSpeakerTitle
09/23/2016Astro SeminarAshley ZaudererObservational Signatures of Tidal Disruption Events: Are Jets and Radio Emission Ubiquitous? [ + Description ]
09/30/2016Astro SeminarZoltan HaimanRapid Formation of the First Supermassive Black Holes [ + Description ]
10/07/2016Astro SeminarPeter GarnavichThe Earliest Hours of Supernovae with Kepler/K2 [ + Description ]
10/21/2016Astro SeminarRachel SommervilleThe impact of AGN driven winds on galaxy quenching, morphology, and structure [ + Description ]
11/04/2016Astro SeminarAdrian LiuThe Past, Present, and Future of 21cm Cosmology [ + Description ]
11/11/2016Astro SeminarPieter van DokkumExploring the low surface brightness sky with the Dragonfly Telephoto Array [ + Description ]
11/18/2016Astro SeminarJo BovyStellar streams and fundamental physics [ + Description ]
12/02/2016Astro SeminarSjoert van VelzenNew ways to study the tidal disruption of stars by supermassive black holes [ + Description ]
01/23/2017Astro SeminarMaryam ModjazStellar Forensics with the Most Powerful Explosions in the Universe [ + Description ]
01/27/2017Big Apple ColloquiumHiranya PeirisTowards Fundamental Physics from the Cosmic Microwave Background [ + Description ]
02/03/2017Astro SeminarPhilipp MoestaModeling the most powerful explosions in 3D [ + Description ]
02/10/2017Astro SeminarBenoit CotéConnecting Nuclear Astrophysics to Cosmological Structure Formation with Galactic Chemical Evolution [ + Description ]
02/17/2017Astro SeminarOr GraurRage against the dying of the light: what can we learn from three-year-old supernovae? [ + Description ]
03/10/2017Astro SeminarAna BonacaThe Milky Way halo in the Gaia era [ -- Description ]

Description: The Milky Way halo contains only 1% of its stars, but ~90% of the total mass, making it an ideal laboratory for mapping the distribution of dark matter on small scales as well as isolating processes at play in formation of galaxies. Hydrodynamical simulations show that the outer parts of Milky Way-like galaxies are entirely accreted from disrupting satellites, but the inner halos additionally have a component formed in situ. These processes are yet to be disentangled observationally. Combining the first year of Gaia data with ground-based spectroscopic surveys, we identified a metal-rich component of the stellar halo in the Solar neighborhood. Based on their orbital properties, we argue that these stars were formed in situ, originating from the inner Galaxy and having migrated to the Solar circle, thus becoming a part of the relaxed, inner halo population. The dynamical times are longer in the outer halo, such that tidally disrupting satellites are apparent as overdensities in the configuration space. Dozens of such events have been identified in the Milky Way halo, and provide not only irrefutable evidence for its accreted origin, but also serve as excellent tracers of the underlying gravitational potential. We show how to optimally map the distribution of matter in the Galaxy by incorporating constraints from multiple tidal streams, and chart the way forward in anticipation of the future Gaia data releases. (11:00 AM, 726 Broadway, 940, CCPP Seminar)
03/17/2017Astro Seminarn/ano astro seminar -- Spring Break [ + Description ]
03/24/2017Astro Seminarn/ano astro seminar -- prospective graduate student day [ + Description ]
03/31/2017Astro SeminarEmanuele CastorinaCosmology with Neutral Hydrogen [ + Description ]
04/07/2017Astro SeminarColin HillNew Information in Ancient Photons: Novel Approaches to CMB Secondary Anisotropies [ + Description ]
04/21/2017Astro SeminarEliot Quataert [ + Description ]
04/28/2017Astro SeminarAndy Howel [ + Description ]
05/05/2017Astro SeminarTjitske StarkenburgTBA [ + Description ]