Astronomy & Astrophysics Seminar: Observational appearances of the strong magnetic field in X-ray pulsars

Zoom: https://zoom.us/j/7365745304

Abstract:

A review of the observational manifestations of strong magnetic field in X-ray pulsars (accreting neutron stars in binary systems) will be presented. Discoveries obtained during recent years from both timing and spectral analysis will be discussed in the framework of modern theoretical models. Special attention will be given to the question of interaction of the accreting plasma with the NS magnetosphere at a low accretion rate which may result in the centrifugal inhibition of the accretion (aka ``propeller effect'', one of the most direct evidence of the strong magnetic field presented in the vicinity of the neutron stars). However, depending on the properties of the NS and environment pulsar may avoid transition to the propeller regime and end up its outburst in the stable accretion from the cold (recombined) disc. The possibility of using different independent estimates of the magnetic field strength to determine its structure will also be demonstrated. Recently discovered variations in the spectral shape associated with the presence of strong magnetic field will be covered as well.

Seminar Organizer: Dr. Omer Bromberg