First Cross-Correlation Analysis of Interferometric and Resonant-Bar Gravitational-Wave Data for Stochastic Backgrounds

Authors

B. P. Abbott
R. Abbott
Mario C. Diaz, The University of Texas Rio Grande ValleyFollow
R. Grosso, The University of Texas Rio Grande Valley
Soumya Mohanty, The University of Texas Rio Grande ValleyFollow
Soma Mukherjee, The University of Texas Rio Grande ValleyFollow
Cristina V. Torres, The University of Texas Rio Grande Valley

Document Type

Article

Publication Date

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 1.5×10−23  Hz−1/2. In the traditional units of h2100Ωgw(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.

Comments

© 2007 American Physical Society. Original published version available at https://doi.org/10.1103/PhysRevD.76.022001

Recommended Citation

Abbott, B., et al. “First Cross-Correlation Analysis of Interferometric and Resonant-Bar Gravitational-Wave Data for Stochastic Backgrounds.” Physical Review D, vol. 76, no. 2, American Physical Society, July 2007, p. 022001, doi:10.1103/PhysRevD.76.022001.

Publication Title

Physical Review D

DOI

10.1103/PhysRevD.76.022001