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© 2016 American Physical Society. Recent nondetection of gravitational-wave backgrounds from pulsar timing arrays casts further uncertainty on the evolution of supermassive black hole binaries. We study the capabilities of current gravitational-wave observatories to detect individual binaries and demonstrate that, contrary to conventional wisdom, some are, in principle, detectable throughout the Universe. In particular, a binary with rest-frame mass 1010Ma can be detected by current timing arrays at arbitrarily high redshifts. The same claim will apply for less massive binaries with more sensitive future arrays. As a consequence, future searches for nanohertz gravitational waves could be expanded to target evolving high-redshift binaries. We calculate the maximum distance at which binaries can be observed with pulsar timing arrays and other detectors, properly accounting for redshift and using realistic binary waveforms.
|Journal||Physical Review Letters|
|Publication status||Published - 10 Mar 2016|
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Detection and Localisation of Gravitational Waves using Pulsar Timing Array
Wen, L., Hobbs, G., Manchester, R., Kramer, M. & Li, K.
1/01/15 → 30/06/19