|Speaker||Talk Date||Talk Series|
|Ramesh Narayan, Harvard||25 November 2010||The Sackler Lectures|
An astrophysical black hole is completely described with just two parameters: its mass and its dimensionless spin. A few dozen black holes have mass estimates, but until recently none had a reliable spin estimate. In the last few years, our group has measured spin parameters for a small number of black holes in X-ray binaries. The talk will describe the method we use to make these measurements and will discuss implications of the results obtained so far.