Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model
Abbott, B. P. Mikhailov, Eugeniy E. Rew, H. Zhang, M.
Abbott, B. P.
Mikhailov, Eugeniy E.
Rew, H.
Zhang, M.
Abstract
Results are presented from a semicoherent search for continuous gravitational waves from the brightest low-mass X-ray binary, Scorpius X-1, using data collected during the first Advanced LIGO observing run. The search combines a frequency domain matched filter (Bessel-weighted F-statistic) with a hidden Markov model to track wandering of the neutron star spin frequency. No evidence of gravitational waves is found in the frequency range 60-650 Hz. Frequentist 95% confidence strain upper limits, h(0)(95%) = 4.0 x 10(-25), 8.3 x 10(-25), and 3.0 x 10(-25) for electromagnetically restricted source orientation, unknown polarization, and circular polarization, respectively, are reported at 106 Hz. They are <= 10 times higher than the theoretical torque-balance limit at 106 Hz.
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2017-06-27
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Physics
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https://doi.org/10.1103/PhysRevD.95.122003