The bizarre object SS433 is a binary system in which material for one component is being accreted onto a compact, massive companion. The accretion disk is so hot that matter and radiation are being expelled from its surface in powerful beams at velocities close to the speed of light. SS433 serves as a nearby example of the beaming of radiation by the strong gravitational field around a massive object also believed to power the distant quasars.
``The Bizarre Spectrum of SS433'', Margon, B. 1980, Scientific American October, 54.
``SS433 -- Enigma of the Century'', Schorn, R. A. 1981, Sky and Telescope 62 (August), 100.
``Relativistic Jets in SS433'', Margon, B. 1982, Science 215 (Jan 15), 247.
``The Central X--ray Source in SS433'', Grindlay J.E. et al., 1984, Astrophys. J. 277, 286.
``The Quest for SS433'', Clark, D.H. 1986, (New York: Viking Penguin, Inc.).
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