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

Abbott, B. and Abbott, R. and Adhikari, R. and Agresti, J. and Ajith, P. and Allen, B. and Amin, R. and Anderson, S.B. and Lockerbie, N.A. and , LIGO Sci Collaboration and , ALLEGRO Collaboration (2007) First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds. Physical Review D: Particles and Fields, 76 (2). 022001/1-022001/17. ISSN 0556-2821

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    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 Omegagw(f)<=1.02, which corresponds to a gravitational-wave strain at 915 Hz of 1.5×10-23 Hz-1/2. In the traditional units of h1002Omegagw(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.

    Item type: Article
    ID code: 6483
    Notes: Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.
    Keywords: LIGO, ALLEGRO, resonant-bar, gravitational-wave, optics, Optics. Light, Physics
    Subjects: Science > Physics > Optics. Light
    Science > Physics
    Department: Faculty of Science > Physics
    Related URLs:
    Depositing user: Miss Darcy Spiller
    Date Deposited: 09 Jul 2008
    Last modified: 17 Mar 2012 05:52
    URI: http://strathprints.strath.ac.uk/id/eprint/6483

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