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Detection of periodic gravitational wave sources by Hough transform in the f versus &\skew6\dot f ; plane

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In the hierarchical search for periodic sources of gravitational waves, the candidate selection, in the incoherent step, can be performed with Hough transform procedures. In this paper we analyze the problem of sensitivity loss due to discretization of the parameters space versus computing cost, comparing the properties of the sky Hough procedure with those of a new frequency Hough, which is based on a transformation from the time–observed frequency plane to the source frequency–spin down plane. Results on simulated peakmaps suggest various advantages in favor of the use of the frequency Hough. The ones which prove to really make the difference are (1) the possibility of enhancing the frequency resolution without relevantly affecting the computing cost. This reduces the digitization effects; (2) the excess of candidates due to local disturbances in some places of the sky map. They do not affect the new analysis because each map is constructed for only one position in the sky.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0264-9381/25/18/184015

Publication date: September 21, 2008

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