Black holes go extragalactic

Tomasz Bulik
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Tomasz Bulik: Tomasz Bulik is at the Astronomical Observatory, University of Warsaw, Al Ujazdowskie 4, PL-00-478 Warsaw, and the Copernicus Astronomical Center, Warsaw, Poland. tb@astrouw.edu.pl

Nature, 2007, vol. 449, issue 7164, 799-801

Abstract: The mass of a black hole beyond our Galaxy has been calculated, thanks to the presence of an associated star. The hole is the weightiest yet, placing intriguing constraints on how this binary system developed.

Date: 2007
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DOI: 10.1038/449799a

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