All-sky search for periodic gravitational waves in LIGO S4 data - General Relativity and Quantum CosmologyReport as inadecuate




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Abstract: We report on an all-sky search with the LIGO detectors for periodicgravitational waves in the frequency range 50-1000 Hz and with the frequency-stime derivative in the range -1.0E-8 Hz-s to zero. Data from the fourth LIGOscience run S4 have been used in this search. Three different semi-coherentmethods of transforming and summing strain power from Short Fourier TransformsSFTs of the calibrated data have been used. The first, known as -StackSlide-,averages normalized power from each SFT. A -weighted Hough- scheme is alsodeveloped and used, and which also allows for a multi-interferometer search.The third method, known as -PowerFlux-, is a variant of the StackSlide methodin which the power is weighted before summing. In both the weighted Hough andPowerFlux methods, the weights are chosen according to the noise and detectorantenna-pattern to maximize the signal-to-noise ratio. The respectiveadvantages and disadvantages of these methods are discussed. Observing noevidence of periodic gravitational radiation, we report upper limits; weinterpret these as limits on this radiation from isolated rotating neutronstars. The best population-based upper limit with 95% confidence on thegravitational-wave strain amplitude, found for simulated sources distributedisotropically across the sky and with isotropically distributed spin-axes, is4.28E-24 near 140 Hz. Strict upper limits are also obtained for small patcheson the sky for best-case and worst-case inclinations of the spin axes.



Author: LIGO Scientific Collaboration: B. Abbott, et al

Source: https://arxiv.org/



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