Abstract
To some extent, all Galactic binary systems hosting a compact object are potential “microquasars”, so much as all Galactic nuclei may have been quasars, once upon a time. The necessary ingredients for a compact object of stellar mass to qualify as a microquasar seem to be: accretion, rotation, and magnetic field. The presence of a black hole may help, but is not strictly required, since neutron star X-ray binaries and dwarf novae can be powerful jet sources as well. The above issues are broadly discussed throughout this chapter, with a rather trivial question in mind: Why do we care? In other words: are jets a negligible phenomenon in terms of accretion power, or do they contribute significantly to dissipating gravitational potential energy? How do they influence their surroundings? The latter point is especially relevant in a broader context, as there is mounting evidence that outflows powered by supermassive black holes in external galaxies may play a crucial role in regulating the evolution of cosmic structures. Microquasars can also be thought of as a form of quasars for the impatient: what makes them appealing, despite their low number statistics with respect to quasars, are the fast variability timescales. In the first approximation, the physics of the jet-accretion coupling in the innermost regions should be set by the mass/size of the accretor: stellar mass objects vary by 105–108 times shorter timescales, making it possible to study variable accretion modes and related ejection phenomena over average Ph.D. timescales. At the same time, allowing for a systematic comparison between different classes of compact objects – black holes, neutron stars, and white dwarfs – microquasars hold the key to identify and characterize properties that may be unique to, e.g., the presence (or the lack) of an event horizon.
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Acknowledgments
The author is supported by NASA through a Hubble Fellowship grant HST-HF-01218 issued from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. I wish to thank Rob Fender, Elmar Körding, James Miller-Jones, and Valeriu Tudose for providing me with original figures, in part still unpublished.
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Gallo, E. (2010). Radio Emission and Jets from Microquasars. In: Belloni, T. (eds) The Jet Paradigm. Lecture Notes in Physics, vol 794. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-76937-8_4
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