Continuous signals are emitted by various
astrophysical sources (rotating neutron star, neutron star in a
They carry important information on their sources and on fundamental physics.
The signals are very weak but, due to the fact they are continuos, it is possible to implement search procedures that build up the SNR with the time.
The sensitivity of the detectors
to continuous signals is a function of
the noise spectral amplitude (1/sqrt(Hz)) and of the observation time.
Read this note for an introduction to the analysis of continuous waves with resonant detectors.
We have developed a
procedure for the search of signals from periodic sources in the
data of gravitational wave detectors and we have used it to analyze
one year of data from the resonant detector Explorer, searching for
sources located in the Galactic Center (GC).
No signals with amplitude greater than 2.9*10 -24 ,
in the range 921.32-921.38 Hz, were observed using data collected over a time period of 95.7 days,
(for a source located at rigth ascension=17.70 +- 0.01 hours
and declination=-29.00 +- 0.05 degrees).
The procedure and the results have been published on PRD 65,022201 (2002):
click here for the PDF file
We are now running, in collaboration with A. Krolak, K. Borkovsky and P. Jaranovsky (Poland),
an All-Sky search using two days of the Explorer 1991 data.
The procedure is described here (PDF file) and has been published on PRD 65,042003 (2002)
The web site for the ALL-SKY search is HERE !