Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-02-02
Mon.Not.Roy.Astron.Soc. 324 (2001) 797
Astronomy and Astrophysics
Astrophysics
14 pages, 14 figures, uses mn.sty, submitted to MNRAS
Scientific paper
10.1046/j.1365-8711.2001.04217.x
We consider gravitational waves emitted by various populations of compact binaries at cosmological distances. We use population synthesis models to characterize the properties of double neutron stars, double black holes and double white dwarf binaries as well as white dwarf-neutron star, white dwarf-black hole and black hole-neutron star systems. We use the observationally determined cosmic star formation history to reconstruct the redshift distribution of these sources and their merging rate evolution. The gravitational signals emitted by each source during its early-inspiral phase add randomly to produce a stochastic background in the low frequency band with spectral strain amplitude between 10^{-18} Hz^{-1/2} and 5 10^{-17} Hz^{-1/2} at frequencies in the interval [5 10^{-6}-5 10^{-5}] Hz. The overall signal which, at frequencies above 10^{-4}Hz, is largely dominated by double white dwarf systems, might be detectable with LISA in the frequency range [1-10] mHz and acts like a confusion limited noise component which might limit the LISA sensitivity at frequencies above 1 mHz.
Ferrari Valeria
Matarrese Sabino
Portegies Zwart Simon. F.
Schneider Raffaella
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