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Astronomy & Astrophysics manuscript no. gwraa c ESO 2010 July 23, 2010

Summary: Astronomy & Astrophysics manuscript no. gwraa c ESO 2010
July 23, 2010
The gravitational wave signal from diverse populations of double
white dwarf binaries in the Galaxy
Shenghua Yu and C. Simon Jeffery
Armagh Observatory, College Hill, Armagh, BT61 9DG, Northern Ireland
e-mail: syu@arm.ac.uk, csj@arm.ac.uk
Received: 20 April 2010; accepted: 19 July 2010
Context. The gravitational wave (GW) background in the range 0.01 - 30 mHz has been assumed to be dominated by unresolved
radiation from double white dwarf binaries (DWDs). Recent investigations indicate that, at short periods, a number of DWDs should
be resolvable sources of GW.
Aims. To characterize the GW signal which would be detected by LISA from DWDs in the Galaxy.
Methods. We have constructed a Galactic model in which we consider distinct contributions from the bulge, thin disc, thick disc, and
halo, and subsequently executed a population synthesis approach to determine the birth rates, numbers, and period distributions of
DWDs within each component.
Results. In the Galaxy as a whole, our model predicts the current birth rate of DWDs to be 3.21 10-2
, the local density to be


Source: Armagh Observatory


Collections: Physics