CfA Colloquium Schedule Fall 2011
 3 November 2011

3 November 2011

Speaker: Jean Brodie (UC Santa Cruz)

Title:Globular Clusters and Halo Stars: Chemodynamical tracers of galaxy assembly beyond the Local Group

Abstract:I will discuss the new paradigm for the assembly of galaxies and their globular cluster (GC) systems emerging from recent theoretical work and supported by our imaging and spectroscopic data. I will highlight results from our SLUGGS and SMEAGOL surveys of GCs and starlight out to many effective radii in nearby early type galaxies. Data obtained primarily with Suprime-Cam on Subaru and DEIMOS on Keck are compared to a variety of simulations of galaxy build-up. Kinematic signatures, as well as metallicity and surface density distributions of the GCs and the underlying galaxy starlight, support and constrain two-phase galaxy formation scenarios. Early "in situ" formation and subsequent minor mergers may be the dominant mechanisms for building massive early type galaxies and their GC systems. Later major mergers may have been important only in a small minority of cases. I will also explore the relationships between compact stellar systems, including a newly discovered class of faint ultra compact dwarfs (UCDs) that may be markers of the halo assembly process.


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