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Ain, A.; Ascenzi, S.; Barker, D.; Barone, F.; Bazzan, M.; Bejger, M.; Bozzi, A.; Brady, P. R.; Calderón Bustillo, J.; Cao, J.; Caride, S.; Casanueva Diaz, J.; Caudill, S.; Cella, G.; Chan, M.; Cho, H. S.; Ciani, G.; Colla, A.; Collette, C. G.; Cominsky, L.; D’Antonio, S.; Dattilo, V.; Douglas, R.; Ducrot, M.; Engels, W.; Evans, T. M.; Fejer, M. M.; Ferreira, E. C.; Fisher, R. P.; Fournier, J.-D.; Frasconi, F.; Graef, C.; Granata, M.; Green, A. C.; Grunewald, S.; Gushwa, K. E.; Gustafson, R.; Hacker, J. J.; Hardwick, T.; Houston, E. A.; Huang, S.; Jacqmin, T.; Jani, K.; Jaranowski, P.; Kissel, J. S.; Klimenko, S.; Koehlenbeck, S. M.; Korth, W. Z.; Królak, A.; Kuehn, G.; Kumar, R.; Lee, H. M.; Leroy, N.; Lewis, J. B.; Lord, J. E.; Lück, H.; Mantovani, M.; Matone, L.; Miller, B. B.; Mohapatra, S. R. P.; Moore, C. J.; Muir, A. W.; Mukund, N.; Nelemans, G.; Normandin, M. E. N.; Owen, B. J.; Palamos, J. R.; Palomba, C.; Pascucci, D.; Passuello, D.; Pedraza, M.; Pekowsky, L.; Perreca, A.; Pinard, L.; Prestegard, T.; Puncken, O.; Rollins, J. G.; Romanov, G.; Rosińska, D.; Sachdev, S.; Scott, S. M.; Siemens, X.; Singer, L. P.; Srivastava, A. K.; Taylor, R.; Travasso, F.; Tuyenbayev, D.; van Heijningen, J. V.; Vecchio, A.; Vedovato, G.; Veitch, P. J.; Vousden, W. D.; Wallace, L.; Weinert, M.; Weinstein, A. J.; Wipf, C. C.; Wu, D. S.; Yablon, J.; Yamamoto, H.; Zangrando, L.
Physical review. D, 04/2017, Volume: 95, Issue: 8Journal Article
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.
