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    An all-sky search for continuous gravitational waves in the Parkes Pulsar Timing Array data set

    212684_139187_xing.pdf (1.768Mb)
    Access Status
    Open access
    Authors
    Zhu, X.
    Hobbs, G.
    Wen, L.
    Coles, W.
    Wang, J.
    Shannon, R.
    Manchester, R.
    Bailes, M.
    Bhat, Ramesh
    Burke-Spolaor, S.
    Dai, S.
    Keith, M.
    Kerr, M.
    Levin, Y.
    Madison, D.
    Oslowski, S.
    Ravi, V.
    Toomey, L.
    van Straten, W.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhu, X. and Hobbs, G. and Wen, L. and Coles, W. and Wang, J. and Shannon, R. and Manchester, R. et al. 2014. An all-sky search for continuous gravitational waves in the Parkes Pulsar Timing Array data set. Monthly Notices of the Royal Astronomical Society. 444 (4): pp. 3709-3720.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stu1717
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/27497
    Collection
    • Curtin Research Publications
    Abstract

    We present results of an all-sky search in the Parkes Pulsar Timing Array (PPTA) Data Release 1 data set for continuous gravitational waves (GWs) in the frequency range from 5 × 10−9 to 2 × 10−7 Hz. Such signals could be produced by individual supermassive binary black hole systems in the early stage of coalescence. We phase up the pulsar timing array data set to form, for each position on the sky, two data streams that correspond to the two GW polarizations and then carry out an optimal search for GW signals on these data streams. Since no statistically significant GWs were detected, we place upper limits on the intrinsic GW strain amplitude h0 for a range of GW frequencies. For example, at 10−8 Hz our analysis has excluded with 95 per cent confidence the presence of signals with h0 ≥ 1.7 × 10−14. Our new limits are about a factor of 4 more stringent than those of Yardley et al. based on an earlier PPTA data set and a factor of 2 better than those reported in the recent Arzoumanian et al. paper. We also present PPTA directional sensitivity curves and find that for the most sensitive region on the sky, the current data set is sensitive to GWs from circular supermassive binary black holes with chirp masses of 109  M☉ out to a luminosity distance of about 100 Mpc. Finally, we set an upper limit of 4 × 10−3 Mpc−3 Gyr−1 at 95 per cent confidence on the coalescence rate of nearby (z ≤ 0.1) supermassive binary black holes in circular orbits with chirp masses of 1010  M☉.

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