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Directed search for gravitational waves from Scorpius X-1 with initial LIGO data

Adams, T., Dooley, Katherine, Edwards, M., Fairhurst, Stephen, Fays, Maxime, Grote, Hartmut, Hannam, Mark, Hopkins, Paul, Ohme, Frank, Pannarale Greco, Francesco, Predoi, Valeriu, Purrer, M., Schmidt, P., Sutton, Patrick J. and Williamson, Andrew R. 2015. Directed search for gravitational waves from Scorpius X-1 with initial LIGO data. Physical Review d Particles and Fields 91 (6) , 062008. 10.1103/PhysRevD.91.062008

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We present results of a search for continuously emitted gravitational radiation, directed at the brightest low-mass x-ray binary, Scorpius X-1. Our semicoherent analysis covers 10 days of LIGO S5 data ranging from 50–550 Hz, and performs an incoherent sum of coherent 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 1.3×10 −24 and 8×10 −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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Additional Information: For a full list of authors please follow the link to the Publisher's website.
Publisher: American Physical Society
ISSN: 0556-2821
Last Modified: 11 Dec 2020 03:07

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