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Nature 428, 704-705 (15 April 2004) | doi:10.1038/428704a
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Astronomy: The missing black-hole link
Nate McCrady1
Abstract
A class of black holes of intermediate mass is expected but has never been detected. The suggestion that these beasts might lurk behind powerful X-ray sources in nearby galaxies is now strengthened.
Black holes are known to exist in two mass regimes: those between two and ten times the mass of the Sun, known as stellar-mass black holes and formed from the collapse of the most massive stars; and those between a million and a billion times the mass of the Sun, the 'supermassive' black holes. Such behemoths, including the one at the centre of the Milky Way1, are the engines powering quasars and active galactic nuclei.
- Nate McCrady is in the Department of Astronomy, University of California, Berkeley, California 94703, USA.
e-mail: Email: nmccrady@astro.berkeley.edu
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