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Phys. Rev. D 72, 102004 (2005) [22 pages]

First all-sky upper limits from LIGO on the strength of periodic gravitational waves using the Hough transform

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B. Abbott et al. LIGO Scientific Collaboration
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Received 13 September 2005; published 28 November 2005

We perform a wide parameter-space search for continuous gravitational waves over the whole sky and over a large range of values of the frequency and the first spin-down parameter. Our search method is based on the Hough transform, which is a semicoherent, computationally efficient, and robust pattern recognition technique. We apply this technique to data from the second science run of the LIGO detectors and our final results are all-sky upper limits on the strength of gravitational waves emitted by unknown isolated spinning neutron stars on a set of narrow frequency bands in the range 200–400   Hz. The best upper limit on the gravitational-wave strain amplitude that we obtain in this frequency range is 4.43×10-23.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.72.102004
DOI:
10.1103/PhysRevD.72.102004
PACS:
04.80.Nn, 07.05.Kf, 95.55.Ym, 97.60.Gb