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

First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds
First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds
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 ?gw(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 h1002?gw(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.
1550-7998
022001-[17pp]
Abbott, B.
9d06072e-d002-47e9-a49b-d209a2c79e00
Abbott, R.
ceb7bd1e-f214-46dd-9972-a194692a86aa
Adhikari, R.
09554275-026e-4fa9-a28c-9165f58be847
Jones, D.I.
470dd157-c8be-404c-991b-bfa1e1ab4e31
LIGO Scientific Collaboration, None
545a14ec-cd8f-41e0-9287-acfe4ffaf8e8
LIGO Scientific Collaboration
Abbott, B.
9d06072e-d002-47e9-a49b-d209a2c79e00
Abbott, R.
ceb7bd1e-f214-46dd-9972-a194692a86aa
Adhikari, R.
09554275-026e-4fa9-a28c-9165f58be847
Jones, D.I.
470dd157-c8be-404c-991b-bfa1e1ab4e31
LIGO Scientific Collaboration, None
545a14ec-cd8f-41e0-9287-acfe4ffaf8e8

Abbott, B., Abbott, R., Adhikari, R., Jones, D.I. and LIGO Scientific Collaboration, None , LIGO Scientific Collaboration (2007) First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds. Physical Review D, 76 (2), 022001-[17pp]. (doi:10.1103/PhysRevD.76.022001).

Record type: Article

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 ?gw(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 h1002?gw(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.

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Published date: July 2007

Identifiers

Local EPrints ID: 48522
URI: https://eprints.soton.ac.uk/id/eprint/48522
ISSN: 1550-7998
PURE UUID: f8e9b2e1-2b6d-4374-9a85-3835f747982f

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Date deposited: 27 Sep 2007
Last modified: 13 Mar 2019 20:56

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