MG11 
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Abstract

First coincidence search among periodic sources candidates with the Virgo data

With the data of the two commissioning runs C6 and C7, we constructed two periodic source candidates data bases, each with about 500 million candidates. Each candidate is defined by the physical parameters of the source, namely the frequency, sky position and spin-down first order parameter value; also the critical ratio and the Hough map mean value for each candidate, that express its significance, are stored in the data base. These data are all sky, span the band of 50-1050 Hz and cover the spin-down age above 1250 years. Then we performed a preliminary search for coincidences between the physical parameters of the two candidate sets. We present the full procedure and the results.

Incoherent strategies for the network detection of periodic gravitational waves

Although the detection of periodic gravitational waves can be performed by a single antenna, the use of more antennas can enhance the sensitivity and the reliability of the detection. The use of incoherent detection methods for the periodic gravitational sources, based on short FFT databases and Hough maps, has the advantage of higher robustness and lower computational cost; this permits the investigation of a larger parameter space. We propose the use of an adaptive procedure, that takes into account the (time varying) noises and radiation patterns of the antennas in order to construct more sensitive Hough maps. This method is compared to the coincidences of single antenna candidates.