A directed search for gravitational waves from Scorpius X-1 with initial LIGO
Creators: name: The LIGO Scientific Collaboration
name: The Virgo Collaboration
name: Aasi, J.
name: Abbott, B. P.
name: Abbott, R.
name: Abbott, T.
name: Abernathy, M. R.
name: Acernese, F.
name: Ackley, K.
name: Adams, C.
name: Adams, T.
name: Adams, T.
name: Addesso, P.
name: Adhikari, R. X.
name: Adya, V.
name: Affeldt, C.
name: Agathos, M.
name: Agatsuma, K.
name: Aggarwal, N.
name: Aguiar, O. D.
name: Ain, A.
name: Ajith, P.
name: Alemic, A.
name: Allen, B.
name: Allocca, A.
name: Amariutei, D.
name: Anderson, S. B.
name: Anderson, W. G.
name: Arai, K.
name: Araya, M. C.
name: Arceneaux, C.
name: Areeda, J. S.
name: Ashton, G.
name: Ast, S.
name: Aston, S. M.
name: Astone, P.
name: Aufmuth, P.
name: Aulbert, C.
name: Aylott, B. E.
name: Babak, S.
name: Baker, P. T.
name: Baldaccini, F.
name: Ballardin, G.
name: Ballmer, S. W.
name: Barayoga, J. C.
name: Barbet, M.
name: Barclay, S.
name: Barish, B. C.
name: Barker, D.
name: Barone, F.
name: Barr, B.
name: Barsotti, L.
name: Barsuglia, M.
name: Bartlett, J.
name: Barton, M. A.
name: Bartos, I.
name: Bassiri, R.
name: Basti, A.
name: Batch, J. C.
name: Bauer, Th. S.
name: Baune, C.
name: Bavigadda, V.
name: Behnke, B.
name: Bejger, M.
name: Belczynski, C.
name: Bell, A. S.
name: Bell, C.
name: Benacquista, M.
name: Bergman, J.
name: Bergmann, G.
name: Berry, C. P. L.
name: Bersanetti, D.
name: Bertolini, A.
name: Betzwieser, J.
name: Bhagwat, S.
name: Bhandare, R.
name: Bilenko, I. A.
name: Billingsley, G.
name: Birch, J.
name: Biscans, S.
name: Bitossi, M.
name: Biwer, C.
name: Bizouard, M. A.
name: Blackburn, J. K.
name: Blackburn, L.
name: Blair, C. D.
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name: Bloemen, S.
name: Bock, O.
name: Bodiya, T. P.
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name: Bogaert, G.
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name: Bond, C.
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name: Bonelli, L.
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name: Bork, R.
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name: Boschi, V.
name: Bose, Sukanta
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name: Brau, J. E.
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name: Vecchio, A.
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name: Veitch, P. J.
name: Venkateswara, K.
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name: Vincent-Finley, R.
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name: Vitale, S.
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name: Vyatchanin, S. P.
name: Wade, A. R.
name: Wade, L.
name: Wade, M.
name: Walker, M.
name: Wallace, L.
name: Walsh, S.
name: Wang, H.
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name: Wang, X.
name: Ward, R. L.
name: Warner, J.
name: Was, M.
name: Weaver, B.
name: Wei, L. -W.
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name: Weinstein, A. J.
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name: Wen, L.
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name: Yancey, C. C.
name: Yang, Q.
name: Yvert, M.
name: Zadrożny, A.
name: Zanolin, M.
name: Zendri, J. -P.
name: Zhang, Fan
name: Zhang, L.
name: Zhang, M.
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name: Zhao, C.
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name: Zucker, M. E.
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name: Zweizig, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present results of a search for continuously-emitted gravitational radiation, directed at the brightest low-mass X-ray binary, Scorpius X-1. Our semi-coherent analysis covers 10 days of LIGO S5 data ranging from 50-550 Hz, and performs an incoherent sum of coherent $\mathcal{F}$-statistic power distributed amongst frequency-modulated orbital sidebands. All candidates not removed at the veto stage were found to be consistent with noise at a 1% false alarm rate. We present Bayesian 95% confidence upper limits on gravitational-wave strain amplitude using two different prior distributions: a standard one, with no a priori assumptions about the orientation of Scorpius X-1; and an angle-restricted one, using a prior derived from electromagnetic observations. Median strain upper limits of 1.3e-24 and 8e-25 are reported at 150 Hz for the standard and angle-restricted searches respectively. This proof of principle analysis was limited to a short observation time by unknown effects of accretion on the intrinsic spin frequency of the neutron star, but improves upon previous upper limits by factors of ~1.4 for the standard, and 2.3 for the angle-restricted search at the sensitive region of the detector.
description: 19 pages, 8 figures