Analysis of first LIGO science data for stochastic gravitational waves

B. Abbott, C.A. Cantley, LIGO Scientific Collaboration

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

We present the analysis of between 50 and 100 h of coincident interferometric strain data used to search for and establish an upper limit on a stochastic background of gravitational radiation. These data come from the first LIGO science run, during which all three LIGO interferometers were operated over a 2-week period spanning August and September of 2002. The method of cross correlating the outputs of two interferometers is used for analysis. We describe in detail practical signal processing issues that arise when working with real data, and we establish an observational upper limit on a f−3 power spectrum of gravitational waves. Our 90% confidence limit is Ω0h2100<~23±4.6 in the frequency band 40–314 Hz, where h100 is the Hubble constant in units of 100 km/sec/Mpc and Ω0 is the gravitational wave energy density per logarithmic frequency interval in units of the closure density. This limit is approximately 104 times better than the previous, broadband direct limit using interferometric detectors, and nearly 3 times better than the best narrow-band bar detector limit. As LIGO and other worldwide detectors improve in sensitivity and attain their design goals, the analysis procedures described here should lead to stochastic background sensitivity levels of astrophysical interest.
LanguageEnglish
Article number122004
Number of pages24
JournalPhysical Review D
Volume69
Issue number12
DOIs
Publication statusPublished - 30 Jun 2004

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LIGO (observatory)
gravitational waves
detectors
interferometers
confidence limits
Hubble constant
sensitivity
closures
narrowband
power spectra
signal processing
astrophysics
flux density
broadband
intervals
output

Keywords

  • gravitational radiation
  • gravitational waves
  • interferometric detection

Cite this

Abbott, B. ; Cantley, C.A. ; LIGO Scientific Collaboration. / Analysis of first LIGO science data for stochastic gravitational waves. In: Physical Review D. 2004 ; Vol. 69, No. 12.
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Analysis of first LIGO science data for stochastic gravitational waves. / Abbott, B.; Cantley, C.A.; LIGO Scientific Collaboration.

In: Physical Review D, Vol. 69, No. 12, 122004, 30.06.2004.

Research output: Contribution to journalArticle

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T1 - Analysis of first LIGO science data for stochastic gravitational waves

AU - Abbott, B.

AU - Cantley, C.A.

AU - LIGO Scientific Collaboration

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AB - We present the analysis of between 50 and 100 h of coincident interferometric strain data used to search for and establish an upper limit on a stochastic background of gravitational radiation. These data come from the first LIGO science run, during which all three LIGO interferometers were operated over a 2-week period spanning August and September of 2002. The method of cross correlating the outputs of two interferometers is used for analysis. We describe in detail practical signal processing issues that arise when working with real data, and we establish an observational upper limit on a f−3 power spectrum of gravitational waves. Our 90% confidence limit is Ω0h2100<~23±4.6 in the frequency band 40–314 Hz, where h100 is the Hubble constant in units of 100 km/sec/Mpc and Ω0 is the gravitational wave energy density per logarithmic frequency interval in units of the closure density. This limit is approximately 104 times better than the previous, broadband direct limit using interferometric detectors, and nearly 3 times better than the best narrow-band bar detector limit. As LIGO and other worldwide detectors improve in sensitivity and attain their design goals, the analysis procedures described here should lead to stochastic background sensitivity levels of astrophysical interest.

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KW - gravitational waves

KW - interferometric detection

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