Oct 23, 2013
George Lake, University of Zurich
"What's a Galaxy?"
This seems like a simple enough question. Recently, the question has
referred to the difference between dwarf galaxies and star clusters. Instead,
I will look at the subtle back and forth over the last decades in our
understanding of galaxies and clusters of galaxies. I will give a simple
definition of "galaxy", show the phenomenology behind the
transition and speculate on the physical mechanisms that are responsible.