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This paper presents results of an all-sky searches for periodic gravitationalwaves in the frequency range [50, 1190] Hz and with frequency derivative rangesof [-2 x 10^-9, 1.1 x 10^-10] Hz/s for the fifth LIGO science run (S5). Thenovelty of the search lies in the use of a non-coherent technique based on theHough-transform to combine the information from coherent searches on timescalesof about one day. Because these searches are very computationally intensive,they have been deployed on the Einstein@Home distributed computing projectinfrastructure. The search presented here is about a factor 3 more sensitivethan the previous Einstein@Home search in early S5 LIGO data. Thepost-processing has left us with eight surviving candidates. We show thatdeeper follow-up studies rule each of them out. Hence, since no statisticallysignificant gravitational wave signals have been detected, we report upperlimits on the intrinsic gravitational wave amplitude h0. For example, in the0.5 Hz-wide band at 152.5 Hz, we can exclude the presence of signals with h0greater than 7.6 x 10^-25 with a 90% confidence level.

Einstein@Home all-sky search for periodic gravitational waves in LIGO S5 data