MPE/Cluster Talk

6186 1494934260

Jets from black-hole X-ray binaries: formation, content, and destruction

  • Date: May 17, 2017
  • Time: 11:00 - 12:00
  • Speaker: Nick Kylafis (Univ. of Crete)
  • Location: MPA
  • Room: Old Lecture Hall 401
  • Host: Excellence Cluster Universe
Abstract: Jets have been observed from both neutron-star and black-hole X-ray binaries. There are many similarities between the two and a few differences. I will offer a physical explanation of the formation and destruction of jets from compact objects. The basic concept in the physical explanation is the Cosmic Battery, the mechanism that creates the required magnetic field for the jet ejection. The Cosmic Battery operates efficiently in accretion flows consisting of an inner hot flow and an outer thin accretion disk independently of the nature of the compact object. It is therefore natural to always expect a jet in the right side of a spectral hardness – luminosity diagram and to never expect a jet in the left side. As a consequence, most of the phenomenology of an outburst can be explained with only one parameter, the mass accretion rate. In the end, I will discuss the energy distribution of the electrons in the jet. Contrary to common belief, it is not necessary to assume a power-law distribution of electron energies. A thermal jet produces similar radio spectra.
 
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