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

(LIGO Scientific Collaboration and Virgo Collaboration)

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)

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.

Original languageEnglish
Article number082005
JournalPhysical Review D
Volume95
Issue number8
DOIs
StatePublished - 19 Apr 2017

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LIGO (observatory)
globular clusters
gravitational waves
neutron stars
ellipticity
energy conservation
sky
confidence
synchronism
interferometers
statistics
broadband
costs
stars
detectors
predictions

Cite this

(LIGO Scientific Collaboration and Virgo Collaboration). / Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544. In: Physical Review D. 2017 ; Vol. 95, No. 8.
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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 = "{(LIGO Scientific Collaboration and Virgo Collaboration)} and Abbott, {B. P.} and R. Abbott and Abbott, {T. D.} and Abernathy, {M. R.} and F. Acernese and K. Ackley and C. Adams and T. Adams and P. Addesso and Adhikari, {R. X.} and Adya, {V. B.} and C. Affeldt and M. Agathos and K. Agatsuma and N. Aggarwal and Aguiar, {O. D.} and L. Aiello and A. Ain and B. Allen and A. Allocca and Altin, {P. A.} and Anderson, {S. B.} and Anderson, {W. G.} and K. Arai and Araya, {M. C.} and Arceneaux, {C. C.} and Areeda, {J. S.} and N. Arnaud and Arun, {K. G.} and S. Ascenzi and G. Ashton and M. Ast and Aston, {S. M.} and P. Astone and P. Aufmuth and C. Aulbert and S. Babak and P. Bacon and Bader, {M. K.M.} and Baker, {P. T.} and F. Baldaccini and G. Ballardin and Ballmer, {S. W.} and Barayoga, {J. C.} and Barclay, {S. E.} and Barish, {B. C.} and D. Barker and F. Barone and B. Barr and Marc Favata",
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Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544. / (LIGO Scientific Collaboration and Virgo Collaboration).

In: Physical Review D, Vol. 95, No. 8, 082005, 19.04.2017.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544

AU - (LIGO Scientific Collaboration and Virgo Collaboration)

AU - Abbott, B. P.

AU - Abbott, R.

AU - Abbott, T. D.

AU - Abernathy, M. R.

AU - Acernese, F.

AU - Ackley, K.

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AU - Adams, T.

AU - Addesso, P.

AU - Adhikari, R. X.

AU - Adya, V. B.

AU - Affeldt, C.

AU - Agathos, M.

AU - Agatsuma, K.

AU - Aggarwal, N.

AU - Aguiar, O. D.

AU - Aiello, L.

AU - Ain, A.

AU - Allen, B.

AU - Allocca, A.

AU - Altin, P. A.

AU - Anderson, S. B.

AU - Anderson, W. G.

AU - Arai, K.

AU - Araya, M. C.

AU - Arceneaux, C. C.

AU - Areeda, J. S.

AU - Arnaud, N.

AU - Arun, K. G.

AU - Ascenzi, S.

AU - Ashton, G.

AU - Ast, M.

AU - Aston, S. M.

AU - Astone, P.

AU - Aufmuth, P.

AU - Aulbert, C.

AU - Babak, S.

AU - Bacon, P.

AU - Bader, M. K.M.

AU - Baker, P. T.

AU - Baldaccini, F.

AU - Ballardin, G.

AU - Ballmer, S. W.

AU - Barayoga, J. C.

AU - Barclay, S. E.

AU - Barish, B. C.

AU - Barker, D.

AU - Barone, F.

AU - Barr, B.

AU - Favata, Marc

PY - 2017/4/19

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N2 - 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.

AB - 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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U2 - 10.1103/PhysRevD.95.082005

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JO - Physical Review D

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SN - 2470-0010

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