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.
Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model
Allocca, A.;Basti, A.;Boschi, V.;Cerretani, G.;Deléglise, S.;DEL POZZO, WALTER;Di Girolamo, T.;DI LIETO, ALBERTO;Di Renzo, F.;Fernandez Galiana, A.;FERRANTE, ISIDORO;Ferrini, F.;FIDECARO, FRANCESCO;Gosselin, M.;Passaquieti, R.;Passuello, D.;Patricelli, B.;Pitkin, M.;POGGIANI, ROSA;Raymond, V.;RAZZANO, MASSIMILIANO;TONELLI, MAURO;
2017-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.