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.
Abbott, B. P.
20b32f53-5355-40eb-9d69-91c95d56e693
Jones, David
b8f3e32c-d537-445a-a1e4-7436f472e160
The LIGO Scientific Collaboration and the Virgo Collaboration
2017
Abbott, B. P.
20b32f53-5355-40eb-9d69-91c95d56e693
Jones, David
b8f3e32c-d537-445a-a1e4-7436f472e160
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), [082005].
(doi:10.1103/PhysRevD.95.082005).
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.
Text
1607.02216
- Accepted Manuscript
More information
Accepted/In Press date: 3 April 2017
e-pub ahead of print date: 19 April 2017
Published date: 2017
Identifiers
Local EPrints ID: 416949
URI: http://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: 16 Mar 2024 03:06
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Contributors
Author:
B. P. Abbott
Corporate Author: The LIGO Scientific Collaboration and the Virgo Collaboration
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