Title

First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds

Authors

B. Abbott, California Institute of Technology
R. Abbott, California Institute of Technology
R. Adhikari, California Institute of Technology
J. Agresti, California Institute of Technology
P. Ajith, Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
B. Allen, Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
R. Amin, Louisiana State University
S. B. Anderson, California Institute of Technology
W. G. Anderson, University of Wisconsin-Milwaukee
M. Arain, University of Florida
M. Araya, California Institute of Technology
H. Armandula, California Institute of Technology
M. Ashley, The Australian National University
S. Aston, University of Birmingham
P. Aufmuth, Universitat de les Illes Balears
C. Aulbert, Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
S. Babak, Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
S. Ballmer, California Institute of Technology
H. Bantilan, Carleton College, USA
B. C. Barish, California Institute of Technology
C. Barker, LIGO Livingston
D. Barker, LIGO Livingston
B. Barr, University of Glasgow
P. Barriga, The University of Western Australia
M. A. Barton, University of Glasgow
K. Bayer, LIGO Hanford
K. Belczynski, Northwestern University
J. Betzwieser, LIGO Hanford
P. T. Beyersdorf, San Jose State University
B. Bhawal, California Institute of Technology
I. A. Bilenko, Lomonosov Moscow State University
G. Billingsley, California Institute of Technology
R. Biswas, University of Wisconsin-Milwaukee

Document Type

Article

Publication Date

7-9-2007

Abstract

Data from the LIGO Livingston interferometer and the ALLEGRO resonant-bar detector, taken during LIGO's fourth science run, were examined for cross correlations indicative of a stochastic gravitational-wave background in the frequency range 850-950 Hz, with most of the sensitivity arising between 905 and 925 Hz. ALLEGRO was operated in three different orientations during the experiment to modulate the relative sign of gravitational-wave and environmental correlations. No statistically significant correlations were seen in any of the orientations, and the results were used to set a Bayesian 90% confidence level upper limit of Ωgw(f)≤1.02, which corresponds to a gravitational-wave strain at 915 Hz of 1.5×10-23Hz-1/2. In the traditional units of h1002Ωgw(f), this is a limit of 0.53, 2 orders of magnitude better than the previous direct limit at these frequencies. The method was also validated with successful extraction of simulated signals injected in hardware and software. © 2007 The American Physical Society.

Publication Source (Journal or Book title)

Physical Review D - Particles, Fields, Gravitation and Cosmology

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