Oleg Kargaltsev from George Washington University will be the featured speaker at an upcoming Department of Physics and Astronomy colloquium. His talk is titled, "Galactic Archeology: What Can We Learn from Stellar Remains?"
Kargaltsev will provide an overview of populations of isolated (or not actively accreting) compact objects in our Galaxy. In recent years there has been significant progress in studying neutron stars across different windows of electromagnetic spectrum. The population of neutron stars turned out to be surprisingly diverse. The number of discovered neutron stars suggest either evolutionary links between different types of isolated neutron stars or calls for a revision of current stellar evolution models. Many supernova remnants are still missing compact objects requiring a large population of dim (fast-cooling?) young neutron stars, quiescent black holes, or, possibly, a larger than expected Type Ia supernova rate. He will discuss the connections between the known neutron stars and their host supernova remnant properties, prospects for identifying faint neutron stars and black holes in the vast amount of archival X-ray data, and the machine-learning approach to this challenging task.