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


Abbott, BP and Abbott, R and Siellez, K and Zweizig, J and Sigurdsson, S, LIGO Scientific Collaboration and Virgo Collaboration, Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544, Physical Review D: covering particles, fields, gravitation, and cosmology, 95, (8) Article 082005. ISSN 2470-0010 (2017) [Refereed Article]

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Copyright Statement

2017 American Physical Society. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License ( The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. Must link to published article.

DOI: doi:10.1103/PhysRevD.95.082005


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 NGC6544 at a distance of ≈2.7kpc. 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 9.2days using the matched-filtering F-statistic. We found no gravitational-wave signals and set 95% confidence upper limits as stringent as 6.0x10−25 on intrinsic strain and 8.5x10−6 on fiducial ellipticity. These values beat the indirect limits from energy conservation for stars with characteristic spindown ages older than 300years 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.

Item Details

Item Type:Refereed Article
Keywords:gravitational waves, neutron stars
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:General relativity and gravitational waves
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Siellez, K (Dr Karelle Siellez)
ID Code:152107
Year Published:2017
Web of Science® Times Cited:16
Deposited By:Physics
Deposited On:2022-08-11
Last Modified:2022-09-26
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