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

B. Abbott, C.A. Cantley, LIGO Scientific Collaboration

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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.
Original languageEnglish
Article number102004
Number of pages22
JournalPhysical Review D
Issue number10
Publication statusPublished - 28 Nov 2005


  • LIGO
  • gravitational waves
  • Hough transform

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