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

Adams, T., Dooley, Katherine ORCID: https://orcid.org/0000-0002-1636-0233, Edwards, M., Fairhurst, Stephen ORCID: https://orcid.org/0000-0001-8480-1961, Fays, Maxime, Grote, Hartmut ORCID: https://orcid.org/0000-0002-0797-3943, Hannam, Mark ORCID: https://orcid.org/0000-0001-5571-325X, Hopkins, Paul ORCID: https://orcid.org/0000-0003-1535-3848, Ohme, Frank, Pannarale Greco, Francesco ORCID: https://orcid.org/0000-0002-7537-3210, Predoi, Valeriu ORCID: https://orcid.org/0000-0002-9729-6578, Purrer, M., Schmidt, P., Sutton, Patrick J. ORCID: https://orcid.org/0000-0003-1614-3922 and Williamson, Andrew R. ORCID: https://orcid.org/0000-0002-7627-8688 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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Abstract

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:	13 Jan 2023 03:30
URI:	https://orca.cardiff.ac.uk/id/eprint/80597

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