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

@article{Abbott2005FirstAU,
  title={First all-sky upper limits from LIGO on the strength of periodic gravitational waves using the Hough transform},
  author={Ligo Scientific Collaboration B. Abbott and et al.},
  journal={Physical Review D},
  year={2005},
  volume={72},
  pages={102004}
}
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… 
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