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Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model
Abstrakt (EN)
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<SUB>0</SUB><SUP>95 %</SUP>=4.0 ×1 0<SUP>-25</SUP>, 8.3 ×1 0<SUP>-25</SUP>, and 3.0 ×1 0<SUP>-25</SUP> 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.