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.

Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544 / Abbott, B.P., Abbott, R., Abbott, T.D., Abernathy, M.R., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R.X., Adya, V.B., Affeldt, C., Agathos, M., Agatsuma, K., Aggarwal, N., Aguiar, O.D., Aiello, L., Ain, A., Allen, B., Allocca, A., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 95:8(2017). [10.1103/PhysRevD.95.082005]

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

Di Pace S.;Di Palma I.;Drago M.;Leaci P.;Majorana E.;Mangano V.;Mezzani F.;Naticchioni L.;Pannarale F.;Rapagnani P.;Ricci F.;Salemi F.;Di Giovanni M.
2017

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.
2017
NGC continuous gravitational wave sources
01 Pubblicazione su rivista::01a Articolo in rivista
Search for continuous gravitational waves from neutron stars in globular cluster NGC 6544 / Abbott, B.P., Abbott, R., Abbott, T.D., Abernathy, M.R., Acernese, F., Ackley, K., Adams, C., Adams, T., Addesso, P., Adhikari, R.X., Adya, V.B., Affeldt, C., Agathos, M., Agatsuma, K., Aggarwal, N., Aguiar, O.D., Aiello, L., Ain, A., Allen, B., Allocca, A., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 95:8(2017). [10.1103/PhysRevD.95.082005]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1408478
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