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

9 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
Number of pages15
JournalPhysical Review D
Volume95
Issue number8
DOIs
Publication statusPublished - 19 Apr 2017

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.
@article{ec1b1800571b42e58ef6b3b1dcfacfda,
title = "Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544",
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 = "Ackley, {Kendall Danielle} and Lasky, {P D} and Y Levin and S Qiu and L Sammut and E Thrane and Xingjiang Zhu and {LIGO Scientific Collaboration and Virgo Collaboration}",
year = "2017",
month = "4",
day = "19",
doi = "10.1103/PhysRevD.95.082005",
language = "English",
volume = "95",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "8",

}

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 - Ackley, Kendall Danielle

AU - Lasky, P D

AU - Levin, Y

AU - Qiu, S

AU - Sammut, L

AU - Thrane, E

AU - Zhu, Xingjiang

AU - LIGO Scientific Collaboration and Virgo Collaboration

PY - 2017/4/19

Y1 - 2017/4/19

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.

UR - http://www.scopus.com/inward/record.url?scp=85021659112&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.95.082005

DO - 10.1103/PhysRevD.95.082005

M3 - Article

AN - SCOPUS:85021659112

VL - 95

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 8

M1 - 082005

ER -