A search for periodic gravitational-wave signals from isolated neutron stars in the NAUTILUS detector data is presented. We have analyzed half a year of data over the frequency band < 922.2; 923.2 > Hz, the spindown range <-1.463 x 10(-8); 0 > Hz/s and over the entire sky. We have divided the data into two day stretches and we have analyzed each stretch coherently using matched filtering. We have imposed a low threshold for the optimal detection statistic to obtain a set of candidates that are further examined for coincidences among various data stretches. For some candidates we have also investigated the change of the signal-to-noise ratio when we increase the observation time from 2 to 4 days. Our analysis has not revealed any gravitational-wave signals. Therefore we have imposed upper limits on the dimensionless gravitational-wave amplitude over the parameter space that we have searched. Depending on frequency, our upper limit ranges from 3.4 x 10(-23) to 1.3 x 10(-22). We have attempted a statistical verification of the hypotheses leading to our conclusions. We estimate that our upper limit is accurate to within 18%.
All-sky search of NAUTILUS data / P., Astone; M., Bassan; P., Bonifazi; K. M., Borkowski; R. J., Budzynski; A., Chincarini; E., Coccia; S., D'Antonio; M. D. P., Di Paolo Emilio; V., Fafone; Frasca, Sergio; S., Foffa; G., Giordano; P., Jaranowski; W., Kondracki; A., Krolak; M., Maggiore; A., Marini; Y., Minenkov; I., Modena; G., Modestino; A., Moleti; Pallottino, Giovanni Vittorio; C., Palomba; R., Parodi; M., Pietka; G., Pizzella; H. J., Pletsch; L., Quintieri; Ricci, Fulvio; A., Rocchi; F., Ronga; R., Sturani; R., Terenzi; R., Vaccarone; M., Visco. - In: CLASSICAL AND QUANTUM GRAVITY. - ISSN 0264-9381. - STAMPA. - 25:18(2008), p. 184012. (Intervento presentato al convegno 12th Gravitational Wave Data Analysis Workshop tenutosi a Cambridge, MA nel DEC 13-16, 2007) [10.1088/0264-9381/25/18/184012].
All-sky search of NAUTILUS data
FRASCA, Sergio;PALLOTTINO, Giovanni Vittorio;RICCI, Fulvio;
2008
Abstract
A search for periodic gravitational-wave signals from isolated neutron stars in the NAUTILUS detector data is presented. We have analyzed half a year of data over the frequency band < 922.2; 923.2 > Hz, the spindown range <-1.463 x 10(-8); 0 > Hz/s and over the entire sky. We have divided the data into two day stretches and we have analyzed each stretch coherently using matched filtering. We have imposed a low threshold for the optimal detection statistic to obtain a set of candidates that are further examined for coincidences among various data stretches. For some candidates we have also investigated the change of the signal-to-noise ratio when we increase the observation time from 2 to 4 days. Our analysis has not revealed any gravitational-wave signals. Therefore we have imposed upper limits on the dimensionless gravitational-wave amplitude over the parameter space that we have searched. Depending on frequency, our upper limit ranges from 3.4 x 10(-23) to 1.3 x 10(-22). We have attempted a statistical verification of the hypotheses leading to our conclusions. We estimate that our upper limit is accurate to within 18%.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
