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Science 30 January 1998:
Vol. 279. no. 5351, pp. 676 - 677
DOI: 10.1126/science.279.5351.676
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Research Commentaries

ASTROPHYSICS:
What the Wild Things Are

James H. Buckley

Active galactic nuclei are extremely compact and highly energetic objects, and the mechanisms that produce their radiative emissions at short wavelengths are the subject of debate. In his research commentary, Buckley discusses results presented in the same issue by Mannheim in which the acceleration of protons is suggested as the source. Buckley puts the work in context with the alternative scenario involving an electron mechanism.

The author is in the Department of Physics, Washington University, St. Louis, MO 63130, USA. E-mail: buckley{at}wuphys.wustl.edu

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