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Science 5 November 2004:
Vol. 306. no. 5698, p. 937
DOI: 10.1126/science.306.5698.937b
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This Week in Science

An active galactic nucleus (AGN) can be modeled as a spinning black hole that accretes matter and energizes itself from a disk of gravitationally trapped material. An AGN is characterized as radio-loud if there are radio emissions that might be produced by relativistic jets spurting from the nucleus. Grandi and Palumbo (p. 998) studied the spectral variability of a radio-loud AGN, 3C 273, for 6 years in order to distinguish the jet emission from the disk emission. The two components show a significant amount of variability compared to the total flux, and the jet dominates the higher energy emissions.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)