Speaker
Description
Relativistic, broad-asymmetric Fe K emission lines are observed in many accreting systems from black holes in active galactic nuclei and X-ray binaries to neutron star low-mass X-ray binaries. The origin of the line broadening is often interpreted as due to dynamical broadening and relativistic effects of matter in accretion disks around the compact object. In the case of neutron stars, iron emission lines are weaker and still modelled by relativistic effects of matter in accretion disks. However, we study an alternative model, that the iron emissions line rising from the accretion column or boundary layer above a neutron star, however, the iron line emission from the disk is also considered. I will review the fundamental observations and the link to modelling them with the aim also to give some limits of neutron star mass-radii
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