Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-31
Astronomy and Astrophysics
Astrophysics
5 pages. Invited talk at the conference X-ray Astronomy. Bologna, September 6-10, 1999
Scientific paper
10.1063/1.1434637
Relativistic outflows are common in accreting and forming black holes. Despite the enormous differences in scale, stellar-mass black holes in X-ray binaries and supermassive black holes in Galactic Nuclei produce jets with analogous properties. In both are observed two types of relativistic outflows: 1) quasi-steady compact jets with flat-spectrum, and 2) episodic large-scale ejections with steep-spectrum and apparent superluminal motions. Because of the short time scale of the phenomena in black hole binaries, the formation of synchrotron jets is associated to changes in the X-ray thermal emission from the accretion disk. Besides, the most common class of gamma-ray bursts can be conceived as extreme microquasars, since they are afterglows from ultra-relativistic jets associated to the formation of black holes at cosmological distances.
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