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Astron. Astrophys. 355, 1209-1213 (2000)

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Fluctuations of gravitational wave noise from unresolved extragalactic sources

D.I. Kosenko and K.A. Postnov

Faculty of Physics and Sternberg Astronomical Institute, Moscow University, 119899 Moscow, Russia

Received 28 October 1999 / Accepted 23 November 1999


Angular fluctuations of stochastic gravitational wave backgrounds (GWB) produced by extragalactic astrophysical sources are calculated. The angular properties of such backgrounds are determined by the large scale structure of Universe (galaxy clustering). The evolution of star formation rate with redshift is taken into account. Fluctuations of the metric strain amplitude associated with such noises at angular scales of about one degree are found to be of the order of 5-20% slowly growing toward smaller angular scales. This feature can be potentially used to separate astrophysical GWB from cosmological ones in future experiments.

Key words: gravitational waves – stars: binaries: close – cosmology: miscellaneous

© European Southern Observatory (ESO) 2000

Online publication: March 21, 2000