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Nature 444, 699 (7 December 2006) | doi:10.1038/444699a; Published online 6 December 2006
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Astrophysics: Unity among black holes
Jörn Wilms1
Abstract
Black holes box at two weights: active galactic nuclei are in the super-heavyweight class, whereas galactic black holes are relative featherweights. But does the same physics pack both objects' punches? It seems that it does.
The existence of black holes — agglomerations of mass so concentrated that their gravitational pull allows nothing, not even light, to escape from them — is perhaps the most intriguing prediction of Einstein's general theory of relativity. Since the early 1960s, astronomers have identified two types of compact source that are probably black holes.
- Jörn Wilms is at the Dr. Karl Remeis-Sternwarte Bamberg, Astronomisches Institut der Universität Erlangen–Nürnberg, Sternwartstra
e 7, 96049 Bamberg, Germany.
Email: joern.wilms@sternwarte.uni-erlangen.de
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