All-sky search of NAUTILUS data

作者：Astone P^*; Bassan M; Bonifazi P; Borkowski K M; Budzynski R J; Chincarini A; Coccia E; D'Antonio S; Emilio M Di Paolo; Fafone V; Frasca S; Foffa S; Giordano G; Jaranowski P; Kondracki W; Krolak A; Maggiore M; Marini A; Minenkov Y; Modena I; Modestino G; Moleti A; Pallottino G V; Palomba C; Parodi R; Pietka M; Pizzella G; Pletsch H J; Quintieri L; Ricci F; Rocchi A; Ronga F; Sturani R; Terenzi R; Vaccarone R; Visco M

来源：Classical and Quantum Gravity, 2008, 25(18): 184012.

DOI：10.1088/0264-9381/25/18/184012

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%.

• 出版日期2008-9-21