Kicking a Neutron Star

Professor Jonathan Katz, Department of Physics, Washington University
April 5, 2018 at 12:00 pm
241 Compton
Event Description 

Neutron stars are born in Core Collapse Supernovae and were discovered as radio pulsars. It was soon found that most radio pulsars receive kicks of hundreds of km/s at birth, expelling them from their birthplaces in the Galactic plane and, when (unusually) still bound in binary stars, making their orbits eccentric. Not long after, it was noticed that neutron stars are hundreds of times super-abundant in globular clusters, spectacular but weakly bound clusters of stars in our Galaxy, with escape velocities of 10--20 km/s that should not retain them at all. Recent theoretical work (Gessner and Janka arXiv:1802.05274) indicates that there are two kinds of core collapse, depending on whether it results from electron capture in an O-Ne-Mg core or by collapse onto a more massive Fe core.

Coffee: 11:45 am, 241 Compton