Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-06
Astrophys.J. 623 (2005) 689-699
Astronomy and Astrophysics
Astrophysics
18 pages, 6 figures. Accepted for publication in ApJ
Scientific paper
10.1086/428826
Space-born gravitational-wave interferometers such as {\it LISA} will detect the gravitational wave (GW) signal from the inspiral, plunge and ringdown phases of massive black hole binary mergers at cosmological distances. From the inspiral waves, we will be able to measure the masses of the binaries' members; from the ringdown waves, we will be able to measure the mass of the final merged remnant. A subset of detected events allow the identification of both the inspiral and the ringdown waveforms in a given source, and thus allow a measurement of the total mass-energy lost to GWs over the coalescence, $M_{\rm GW}$. We define ``golden'' binary mergers to be those with measurement errors likely to be small enough for a physically useful determination of $M_{\rm GW}$. A detailed sensitivity study, combined with simple black hole population models, suggests that a few golden binary mergers may be detected during a 3-year {\it LISA} mission lifetime. Any such mass deficit measurement would constitute a robust and valuable observational test of strong-field relativistic gravity. An extension of this concept to include spin measurements may allow a direct empirical test of the black hole area theorem.
Hughes Scott A.
Menou Kristen
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