case western reserve university



Understanding Nearby Galaxy Structure in a Cosmological Context

Kristine Spekkens (Rutgers)

While the current cosmological model for the composition and growth of structure in the Universe is very successful at explaining observations on large scales and at high redshift, there has been little progress towards understanding galactic structure in the context of this framework. In this talk I will highlight some key differences between the kinematics of spiral galaxies and predictions from galaxy formation theory, and I'll present a new velocity field model to assess the role of non-circular motions in generating some of these discrepancies. I will also discuss the implications of recent ALFALFA legacy survey observations of optically dark HI clouds in Virgo for disk galaxy evolution in a cluster environment and for the abundance of gas-rich starless halos in the Local Volume.