Limits on the strength of individual gravitational wave sources using high-cadence observations of PSR B1937+21.
We present the results of our search for gravitational waves from individual sources using observations of PSR B1937+21.Over the period June 2011 to May 2013 we made almost daily observations of the pulsar using the Lovell telescope at Jodrell Bank.These high-cadence observations meant we were sensitive to gravitational waves with frequency up to 4.98× 10-6 Hz, a frequency regime so far probed only by observations of close binary systems.This frequency regime is particularly interesting as it has recently been proposed that at these high frequencies the gravitational wave signature from individual coalescing super-massive black hole binaries may be distinguishable from a stochastic background.Combining the data with observations at three frequencies made with the Westerbork Synthesis Radio Telescope we were able to correct for the deleterious effects of dispersion measure and scattering variations that affect timing observations of this pulsar.The resultant timing residuals still showed unmodeled noise with amplitude at ~ 150 ns, which is periodic and has a fundamental frequency of 3.4yr-1 (1.078 × 10-7 Hz).As the signature is not present in the entire dataset we are able to rule out its origin as being due to either a gravitational wave source or an asteroid and we attribute it to being intrinsic to the rotation behaviour of the pulsar.After removal of this noise component we are able to place significant limits on the presence of individual gravitational wave sources of hs =1.53 × 10-11 at 1 × 10-7 Hz for a source of random location in the sky and hs =4.99 × 10-14 at 1 × 10-7 Hz for an optimally located gravitational wave source.
Pulsar timing Gravitational wave
Shuxu Yi Benjamin W.Stappers Sotirios A.Sanidas Cees G.Bassa Gemma H.Janssen Andrew G.Lyne Michael Kramer Shuang-Nan Zhang
Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Scienc Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester, M13 9PL, United Kingdom Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester, M13 9PL, United Kingdom; MPI für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Scienc
国际会议
昆明
英文
391-398
2014-05-01（万方平台首次上网日期，不代表论文的发表时间）