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공공누리This item is licensed Korea Open Government License

Title
Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544
Author(s)
LIGO Scientific Collaboration and Virgo Collaboration강궁원김정리김지웅장행진조희석
Publication Year
2017-04-19
Abstract
We describe a directed search for continuous gravitational waves in data from the sixth initial LIGOscience run. The target was the nearby globular cluster NGC 6544 at a distance of ≈2.7 kpc. The searchcovered a broad band of frequencies along with first and second frequency derivatives for a fixed skyposition. The search coherently integrated data from the two LIGO interferometers over a time span of9.2 days using the matched-filtering F-statistic. We found no gravitational-wave signals and set95% confidence upper limits as stringent as 6.0 × 10−25 on intrinsic strain and 8.5 × 10−6 on fiducialellipticity. These values beat the indirect limits from energy conservation for stars with characteristic spindownages older than 300 years and are within the range of theoretical predictions for possible neutron-starellipticities. An important feature of this search was use of a barycentric resampling algorithm whichsubstantially reduced computational cost; this method is used extensively in searches of Advanced LIGOand Virgo detector data.
Keyword
continuous gravitational waves; NGC 6544
Journal Title
Physical Review D
Citation Volume
95
ISSN
2470-0010
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Appears in Collections:
7. KISTI 연구성과 > 학술지 발표논문
URI
https://repository.kisti.re.kr/handle/10580/14686
http://www.ndsl.kr/ndsl/search/detail/article/articleSearchResultDetail.do?cn=NART78520327
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