Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544

Abbott, B. P. and Jawahar, S. and Lockerbie, N. A. and Tokmakov, K. V. (2017) Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544. Physical Review D, 95 (8). 082005. ISSN 1550-2368

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    Abstract

    We describe a directed search for continuous gravitational waves in data from the sixth initial LIGO science run. The target was the nearby globular cluster NGC 6544 at a distance of ≈2.7  kpc. The search covered a broad band of frequencies along with first and second frequency derivatives for a fixed sky position. The search coherently integrated data from the two LIGO interferometers over a time span of 9.2 days using the matched-filtering F-statistic. We found no gravitational-wave signals and set 95% confidence upper limits as stringent as 6.0×10−25 on intrinsic strain and 8.5×10−6 on fiducial ellipticity. These values beat the indirect limits from energy conservation for stars with characteristic spin-down ages older than 300 years and are within the range of theoretical predictions for possible neutron-star ellipticities. An important feature of this search was use of a barycentric resampling algorithm which substantially reduced computational cost; this method is used extensively in searches of Advanced LIGO and Virgo detector data.

    Author(s):Abbott, B. P., Jawahar, S. ORCID logoORCID: https://orcid.org/0000-0002-4945-691X, Lockerbie, N. A. ORCID logoORCID: https://orcid.org/0000-0002-1678-3260 and Tokmakov, K. V. ORCID logoORCID: https://orcid.org/0000-0002-2808-6593
    Item type:Article
    ID code:62453
    Keywords:LIGO, gravitational waves, NGC 6544, gravitational wave detectors, neutron stars, pulsars, Physics, Astronomy and Astrophysics
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:28 Nov 2017 12:18
    Last modified:09 Jan 2020 00:36
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/62453
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