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 |
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 |
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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 |
URI: | http://orca.cf.ac.uk/id/eprint/80597 |
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