Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array

Wang JB, Hobbs G, Coles W, Shannon RM, Zhu XJ, Madison DR, Kerr M, Ravi V, Keith MJ, Manchester RN, Levin Y, et al. (2015)
Monthly Notices of the Royal Astronomical Society 446(2): 1657-1671.

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Abstract
Anisotropic bursts of gravitational radiation produced by events such as supermassive black hole mergers leave permanent imprints on space. Such gravitational wave 'memory' (GWM) signals are, in principle, detectable through pulsar timing as sudden changes in the apparent pulse frequency of a pulsar. If an array of pulsars is monitored as a GWM signal passes over the Earth, the pulsars would simultaneously appear to change pulse frequency by an amount that varies with their sky position in a quadrupolar fashion. Here, we describe a search algorithm for such events and apply the algorithm to approximately six years of data from the Parkes Pulsar Timing Array. We find no GWM events and set an upper bound on the rate for events which could have been detected. We show, using simple models of black hole coalescence rates, that this non-detection is not unexpected.
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Wang JB, Hobbs G, Coles W, et al. Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array. Monthly Notices of the Royal Astronomical Society. 2015;446(2):1657-1671.
Wang, J. B., Hobbs, G., Coles, W., Shannon, R. M., Zhu, X. J., Madison, D. R., Kerr, M., et al. (2015). Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array. Monthly Notices of the Royal Astronomical Society, 446(2), 1657-1671.
Wang, J. B., Hobbs, G., Coles, W., Shannon, R. M., Zhu, X. J., Madison, D. R., Kerr, M., Ravi, V., Keith, M. J., Manchester, R. N., et al. (2015). Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array. Monthly Notices of the Royal Astronomical Society 446, 1657-1671.
Wang, J.B., et al., 2015. Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array. Monthly Notices of the Royal Astronomical Society, 446(2), p 1657-1671.
J.B. Wang, et al., “Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array”, Monthly Notices of the Royal Astronomical Society, vol. 446, 2015, pp. 1657-1671.
Wang, J.B., Hobbs, G., Coles, W., Shannon, R.M., Zhu, X.J., Madison, D.R., Kerr, M., Ravi, V., Keith, M.J., Manchester, R.N., Levin, Y., Bailes, M., Bhat, N.D.R., Burke-Spolaor, S., Dai, S., Oslowski, S., van Straten, W., Toomey, L., Wang, N., Wen, L.: Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array. Monthly Notices of the Royal Astronomical Society. 446, 1657-1671 (2015).
Wang, J. B., Hobbs, G., Coles, W., Shannon, R. M., Zhu, X. J., Madison, D. R., Kerr, M., Ravi, V., Keith, M. J., Manchester, R. N., Levin, Y., Bailes, M., Bhat, N. D. R., Burke-Spolaor, S., Dai, S., Oslowski, Stefan, van Straten, W., Toomey, L., Wang, N., and Wen, L. “Searching for gravitational wave memory bursts with the Parkes Pulsar Timing Array”. Monthly Notices of the Royal Astronomical Society 446.2 (2015): 1657-1671.
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