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

Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544
Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544
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.
1550-7998
Abbott, B. P.
20b32f53-5355-40eb-9d69-91c95d56e693
Jones, David
b8f3e32c-d537-445a-a1e4-7436f472e160
The LIGO Scientific Collaboration and the Virgo Collaboration
Abbott, B. P.
20b32f53-5355-40eb-9d69-91c95d56e693
Jones, David
b8f3e32c-d537-445a-a1e4-7436f472e160

Abbott, B. P. and Jones, David , The LIGO Scientific Collaboration and the Virgo Collaboration (2017) Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544. Physical Review D, 95 (8). (doi:10.1103/PhysRevD.95.082005).

Record type: Article

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.

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1607.02216 - Accepted Manuscript
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Accepted/In Press date: 3 April 2017
e-pub ahead of print date: 19 April 2017
Published date: 2017

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Local EPrints ID: 416949
URI: https://eprints.soton.ac.uk/id/eprint/416949
ISSN: 1550-7998
PURE UUID: 53b48122-1ae6-4dd3-afd5-5bdf60390291

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Date deposited: 15 Jan 2018 17:30
Last modified: 13 Mar 2019 19:02

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Contributors

Author: B. P. Abbott
Author: David Jones

University divisions

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