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A data analysis technique for the LIGO–ALLEGRO stochastic background search

John T Whelan1, Sukanta Bose2, Jonathan Hanson3, Ik Siong Heng4, Warren W Johnson3, Martin P McHugh1 and Peter Zhang3

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We describe the cross-correlation measurements being carried out on data from the LIGO Livingston Observatory and the ALLEGRO resonant bar detector. The LIGO data are sampled at 16 384 Hz while the ALLEGRO data are base-banded, i.e., heterodyned at 899 Hz and then sampled at 250 Hz. We handle these different sampling parameters by working in the Fourier domain, and demonstrate the approximate equivalence of this measurement to a hypothetical time-domain method in which both data streams are upsampled.


PACS

04.80.Nn Gravitational wave detectors and experiments

07.05.Kf Data analysis: algorithms and implementation; data management

98.70.Vc Background radiations

MSC

83C35 Gravitational waves

68P15 Database theory

Subjects

Instrumentation and measurement

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 18 (21 September 2005)

Received 4 April 2005, in final form 6 June 2005

Published 6 September 2005



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