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IOP Publishing, Classical and Quantum Gravity, 8(31), p. 085014

DOI: 10.1088/0264-9381/31/8/085014

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Application of a Hough search for continuous gravitational waves on data from the fifth LIGO science run

Journal article published in 2014 by J. F. J. van den Brand, S. van der Putten, M. V. van der Sluys, T. G. F., M. V. Van, A. A. Van, S. S. Y., R. D. Rosa, R. W. P., R. J. S., R. J. G., A. L. Roux, S. R. P., R. M. S., R. J. E. and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We report on an all-sky search for periodic gravitational waves in the frequency range $\mathrm{50-1000 Hz}$ with the first derivative of frequency in the range $-8.9 \times 10^{-10}$ Hz/s to zero in two years of data collected during LIGO's fifth science run. Our results employ a Hough transform technique, introducing a $χ^2$ test and analysis of coincidences between the signal levels in years 1 and 2 of observations that offers a significant improvement in the product of strain sensitivity with compute cycles per data sample compared to previously published searches. Since our search yields no surviving candidates, we present results taking the form of frequency dependent, 95$%$ confidence upper limits on the strain amplitude $h_0$. The most stringent upper limit from year 1 is $1.0\times 10^{-24}$ in the $\mathrm{158.00-158.25 Hz}$ band. In year 2, the most stringent upper limit is $\mathrm{8.9\times10^{-25}}$ in the $\mathrm{146.50-146.75 Hz}$ band. This improved detection pipeline, which is computationally efficient by at least two orders of magnitude better than our flagship Einstein$@$Home search, will be important for "quick-look" searches in the Advanced LIGO and Virgo detector era. ; Comment: Accepted in Classical and Quantum Gravity. Science summary of results available at http://www.ligo.org/science/Publication-S5CWHough/index.php