LIGO Document P1700019-v28

Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model

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Results are presented from a semi-coherent 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 (O1). 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 60650 Hz. Frequentist 95% confidence strain upper limits, h95% = 4.0e−25, 8.3e−25, and 3.0e−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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Published in Phys Rev D vol. 95 pg. 122003.

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