Microblazar

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Microblazars are astronomical objects that can be viewed as miniature versions of blazars due to the properties observed .

A microblazar is an X-ray binary star or a close binary star in which a compact star (either a neutron star or a black hole ) accretes matter from a companion and as a result a relativistic jet is created.

In contrast to the microquasar , the jet in the microblazar is almost aligned in the direction of the observer, which means that the jet is spreading at faster than light speed . Due to the precession of the accretion disk and the jet, the properties of some X-ray binary stars change between those of a microquasar and a microblazar, depending on the orientation of the jet with accompanying fluctuations in the apparent luminosity .

In active galactic nuclei , matter falls into a central black hole with masses of a few hundred thousand to millions of solar masses . Because of the conservation of the angular momentum, an accretion disk forms around the black hole. Jets are created in the disk due to an interaction between the plasma and a wound magnetic field within the framework of magnetohydrodynamics . These dissipate the excess angular momentum and accelerate matter to almost the speed of light . The jets and the accretion disk emit electromagnetic radiation ranging from radio to gamma radiation .

The luminosity of microblazars appears to be increased due to an effect called Doppler boosting. Therefore, microblazars are thought to be a possible explanation for ultra-luminous X-ray sources .

Microblazars are also associated with the formation of high-energy radiation in gamma-ray binary stars .

Suspected microblazars

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  • Elena Gallo, Richard M. Plotkin, Peter G. Jonker: V4641 Sgr: a candidate precessing microblazar . In: Astrophysics. Solar and Stellar Astrophysics . 2013, arxiv : 1310.7032v1 .
  • Maria Massi, Eduardo Ros, Lisa Zimmermann, Guidetta Torricelli-Ciamponi: Microblazar properties of LSI + 61303 . In: Astrophysics. Solar and Stellar Astrophysics . 2012, arxiv : 1206.0599v1 .
  • F. Batejat, JE Conway, A. Rushton, R. Parra, PJ Diamond, CJ Lonsdale, CJ Lonsdale: Rapid variability of the compact radio sources in Arp220. Evidence for a population of microblazars? In: Astrophysics. Solar and Stellar Astrophysics . 2012, arxiv : 1205.3173v1 .