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Abstract:
We characterize and present the details of the follow-up method used on the most significant outliers of
the Hough Einstein@Home all-sky search for continuous gravitational waves [J. Aasi et al Phys. Rev. D 87,
042001 (2013)]. This follow-up method is based on the two-stage approach introduced by [M. Shaltev and
R. Prix, Phys. Rev. D 87, 084057 (2013)], consisting of a semicoherent refinement followed by a fully
coherent zoom. We quantify the efficiency of the follow-up pipeline using simulated signals in Gaussian
noise. This pipeline does not search beyond first-order frequency spin-down, and therefore we also evaluate
its robustness against second-order spin-down. We present the details of the Hough Einstein@Home
follow-up [J. Aasi et al Phys. Rev. D 87, 042001 (2013)] on three hardware-injected signals and on the
eight most significant search outliers of unknown origin.
