Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-09-09
Astron.Astrophys. 394 (2002) 749-752
Astronomy and Astrophysics
Astrophysics
4 pages, 1 Postscript figure, to be published in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20021258
In a recent paper [Ruffa] it was proposed that the massive black hole at the Galactic center may act as a gravitational lens focusing gravitational wave energy to the Earth. Considering the gravitational wave signal emitted by galactic spinning pulsars, an enhancement in the gravitational wave intensity by a factor of a few thousand is found. For galactic and extra-galactic sources the intensity enhancement can be as high as 4,000 and 17,000, respectively. In this note we consider the probability of significant signal enhancement from galactic and extra-galactic pulsars by the proposed mechanism and find that it is actually negligible. The lensing effect due to a possible companion object (a star or the galactic center black hole) of the gravitational wave source is also investigated in the framework of the classical microlensing theory.
de Paolis Francesco
Ingrosso Gabriele
Nucita Achille A.
Qadir Asghar
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