Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-05-08
Astronomy and Astrophysics
Astrophysics
8 pages, 1 figure
Scientific paper
10.1086/310835
We present a study of the gravitational time delay of arrival of signals from binary pulsar systems with rotating black hole companions. In particular, we investigate the strength of this effect (Shapiro delay) as a function of the inclination, eccentricity and period of the orbit, as well as the mass and angular momentum of the black hole. This study is based on direct numerical integration of null geodesics in a Kerr background geometry. We find that, for binaries with sufficiently high orbital inclinations ($> 89^o$) and compact companion masses $> 10 M_\odot$, the effect arising from the rotation of the black hole in the system amounts to a microsecond-level variation of the arrival times of the pulsar pulses. If measurable, this variation could provide a unique signature for the presence of a rotating black hole in a binary pulsar system.
Laguna Pablo
Wolszczan Alex
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