Astron. Astrophys. 336, 786-790 (1998)

On the gravitational wave noise from unresolved extragalactic binaries

D.I. Kosenko and K.A. Postnov

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

Received 12 January 1998 / Accepted 6 May 1998

Abstract

We calculate stochastic gravitational wave background produced by extragalactic merging binary white dwarfs at the LISA frequencies Hz with account of a strong evolution of global star formation rate in the Universe recently established observationally. We show that for the observed global star formation history and modern cosmological models the extragalactic background is an order of magnitude smaller than the mean Galactic value. An early star formation burst at high redshifts can bring it at a higher level but still a few times lower than the mean Galactic one.

Key words: gravitational waves stars: binaries: close

Online publication: July 20, 1998

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