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Abbott, B. P; Abernathy, M; Arain, M. A; Babak, S; Ballmer, S; Barker, D; Barton, M. A; Bassiri, R; Beveridge, N; Blackburn, J. K; Brau, J. E; Brinkmann, M; Cao, J; Caride, S; Cavaglià, M; Clark, J; Clayton, J. H; Conte, R; Coyne, D. C; Creighton, J. D. E; DeRosa, R; Donovan, F; Dumas, J.-C; Eberle, T; Effler, A; Evans, T; Feldbaum, D; Foley, S; Frei, M; Fricke, T. T; Fulda, P; Fyffe, M; Garofoli, J. A; Gretarsson, A. M; Hammer, D; Hanna, C; Harry, G. M; Haughian, K; Hirose, E; Howell, E; Hoyland, D; Kopparapu, R; Kringel, V; Krishnamurthy, S; Krishnan, B; Lastzka, N; Lodhia, D; Lück, H; Lundgren, A; MacInnis, M; Mak, C; Matichard, F; McClelland, D. E; McIntyre, G; Mercer, R. A; Meshkov, S; Miller, J; Moe, B; Morioka, T; Newton, G; Nolting, D; O'Dell, J; O'Reilly, B; Osthelder, C; Pan, Y; Papa, M. A; Pedraza, M; Pekowsky, L; Pitkin, M; Price, L. R; Radkins, H; Robertson, N. A; Robinson, E. L; Ryan, K; Sakosky, M; Saulson, P. R; Savage, R; Scott, J; Sintes, A. M; Slutsky, J; Susmithan, S; Sutton, P. J; Tanner, D. B; Thrane, E; Torrie, C. I; Vahlbruch, H; Vaishnav, B; Vallisneri, M; van der Sluys, M. V; Vecchio, A; Villar, A; Wallace, L; Wen, L; Wessels, P; West, M; Whelan, J. T; Willems, P. A; Winkelmann, L; Yoshida, S; Zhao, C
The Astrophysical journal, 10/2010, Volume: 722, Issue: 2Journal Article
We present a search for periodic gravitational waves from the neutron star in the supernova remnant Cassiopeia A. The search coherently analyzes data in a 12 day interval taken from the fifth science run of the Laser Interferometer Gravitational-Wave Observatory. It searches gravitational-wave frequencies from 100 to 300 Hz and covers a wide range of first and second frequency derivatives appropriate for the age of the remnant and for different spin-down mechanisms. No gravitational-wave signal was detected. Within the range of search frequencies, we set 95% confidence upper limits of (0.7-1.2) X 10--24 on the intrinsic gravitational-wave strain, (0.4-4) X 10--4 on the equatorial ellipticity of the neutron star, and 0.005-0.14 on the amplitude of r-mode oscillations of the neutron star. These direct upper limits beat indirect limits derived from energy conservation and enter the range of theoretical predictions involving crystalline exotic matter or runaway r-modes. This paper is also the first gravitational-wave search to present upper limits on the r-mode amplitude.
