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Placing limits on the stochastic gravitational‐wave background using European Pulsar Timing Array data

Identifieur interne : 001895 ( Istex/Corpus ); précédent : 001894; suivant : 001896

Placing limits on the stochastic gravitational‐wave background using European Pulsar Timing Array data

Auteurs : R. Van Haasteren ; Y. Levin ; G. H. Janssen ; K. Lazaridis ; M. Kramer ; B. W. Stappers ; G. Desvignes ; M. B. Purver ; A. G. Lyne ; R. D. Ferdman ; A. Jessner ; I. Cognard ; G. Theureau ; N. D Mico ; A. Possenti ; M. Burgay ; A. Corongiu ; J. W. T. Hessels ; R. Smits ; J. P. W. Verbiest

Source :

RBID : ISTEX:844CF7F1713E2E0C5BA7491E0AF3024404E6072A

English descriptors

Abstract

Direct detection of low‐frequency gravitational waves (GWs,  Hz) is the main goal of pulsar timing array (PTA) projects. One of the main targets for the PTAs is to measure the stochastic background of gravitational waves (GWB) whose characteristic strain is expected to approximately follow a power‐law of the form , where f is the GW frequency. In this paper we use the current data from the European PTA to determine an upper limit on the GWB amplitude A as a function of the unknown spectral slope α with a Bayesian algorithm, by modelling the GWB as a random Gaussian process. For the case α=−2/3, which is expected if the GWB is produced by supermassive black hole binaries, we obtain a 95 per cent confidence upper limit on A of 6 × 10−15, which is 1.8 times lower than the 95 per cent confidence GWB limit obtained by the Parkes PTA in 2006. Our approach to the data analysis incorporates the multitelescope nature of the European PTA and thus can serve as a useful template for future intercontinental PTA collaborations.

Url:
DOI: 10.1111/j.1365-2966.2011.18613.x

Links to Exploration step

ISTEX:844CF7F1713E2E0C5BA7491E0AF3024404E6072A

Le document en format XML

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<div type="abstract" xml:lang="en">Direct detection of low‐frequency gravitational waves (GWs,  Hz) is the main goal of pulsar timing array (PTA) projects. One of the main targets for the PTAs is to measure the stochastic background of gravitational waves (GWB) whose characteristic strain is expected to approximately follow a power‐law of the form , where f is the GW frequency. In this paper we use the current data from the European PTA to determine an upper limit on the GWB amplitude A as a function of the unknown spectral slope α with a Bayesian algorithm, by modelling the GWB as a random Gaussian process. For the case α=−2/3, which is expected if the GWB is produced by supermassive black hole binaries, we obtain a 95 per cent confidence upper limit on A of 6 × 10−15, which is 1.8 times lower than the 95 per cent confidence GWB limit obtained by the Parkes PTA in 2006. Our approach to the data analysis incorporates the multitelescope nature of the European PTA and thus can serve as a useful template for future intercontinental PTA collaborations.</div>
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<abstract>Direct detection of low‐frequency gravitational waves (GWs,  Hz) is the main goal of pulsar timing array (PTA) projects. One of the main targets for the PTAs is to measure the stochastic background of gravitational waves (GWB) whose characteristic strain is expected to approximately follow a power‐law of the form , where f is the GW frequency. In this paper we use the current data from the European PTA to determine an upper limit on the GWB amplitude A as a function of the unknown spectral slope α with a Bayesian algorithm, by modelling the GWB as a random Gaussian process. For the case α=−2/3, which is expected if the GWB is produced by supermassive black hole binaries, we obtain a 95 per cent confidence upper limit on A of 6 × 10−15, which is 1.8 times lower than the 95 per cent confidence GWB limit obtained by the Parkes PTA in 2006. Our approach to the data analysis incorporates the multitelescope nature of the European PTA and thus can serve as a useful template for future intercontinental PTA collaborations.</abstract>
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<json:string>Tofani et al. 2008</json:string>
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<p>Direct detection of low‐frequency gravitational waves (GWs,
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 Hz) is the main goal of pulsar timing array (PTA) projects. One of the main targets for the PTAs is to measure the stochastic background of gravitational waves (GWB) whose characteristic strain is expected to approximately follow a power‐law of the form
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, where
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is the GW frequency. In this paper we use the current data from the European PTA to determine an upper limit on the GWB amplitude
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as a function of the unknown spectral slope α with a Bayesian algorithm, by modelling the GWB as a random Gaussian process. For the case α=−2/3, which is expected if the GWB is produced by supermassive black hole binaries, we obtain a 95 per cent confidence upper limit on
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, which is 1.8 times lower than the 95 per cent confidence GWB limit obtained by the Parkes PTA in 2006. Our approach to the data analysis incorporates the multitelescope nature of the European PTA and thus can serve as a useful template for future intercontinental PTA collaborations.</p>
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<p>Direct detection of low‐frequency gravitational waves (GWs,
<inlineGraphic alt="inline image" location="equation/MNR_18613_mu1.gif" href=""></inlineGraphic>
 Hz) is the main goal of pulsar timing array (PTA) projects. One of the main targets for the PTAs is to measure the stochastic background of gravitational waves (GWB) whose characteristic strain is expected to approximately follow a power‐law of the form
<inlineGraphic alt="inline image" location="equation/MNR_18613_mu2.gif" href=""></inlineGraphic>
, where
<i>f</i>
is the GW frequency. In this paper we use the current data from the European PTA to determine an upper limit on the GWB amplitude
<i>A</i>
as a function of the unknown spectral slope α with a Bayesian algorithm, by modelling the GWB as a random Gaussian process. For the case α=−2/3, which is expected if the GWB is produced by supermassive black hole binaries, we obtain a 95 per cent confidence upper limit on
<i>A</i>
of 6 × 10
<sup>−15</sup>
, which is 1.8 times lower than the 95 per cent confidence GWB limit obtained by the Parkes PTA in 2006. Our approach to the data analysis incorporates the multitelescope nature of the European PTA and thus can serve as a useful template for future intercontinental PTA collaborations.</p>
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<title>Placing limits on the stochastic gravitational‐wave background using European Pulsar Timing Array data</title>
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<namePart type="given">G. H.</namePart>
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<affiliation>Station de Radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, F18330 Nançay, France</affiliation>
<affiliation>Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720, USA</affiliation>
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<namePart type="given">M. B.</namePart>
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<namePart type="family">Corongiu</namePart>
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<namePart type="given">J. W. T.</namePart>
<namePart type="family">Hessels</namePart>
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<affiliation>Astronomical Institute ‘Anton Pannekoek’, University of Amsterdam, 1098 SJ Amsterdam, the Netherlands</affiliation>
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<namePart type="given">J. P. W.</namePart>
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<abstract lang="en">Direct detection of low‐frequency gravitational waves (GWs,  Hz) is the main goal of pulsar timing array (PTA) projects. One of the main targets for the PTAs is to measure the stochastic background of gravitational waves (GWB) whose characteristic strain is expected to approximately follow a power‐law of the form , where f is the GW frequency. In this paper we use the current data from the European PTA to determine an upper limit on the GWB amplitude A as a function of the unknown spectral slope α with a Bayesian algorithm, by modelling the GWB as a random Gaussian process. For the case α=−2/3, which is expected if the GWB is produced by supermassive black hole binaries, we obtain a 95 per cent confidence upper limit on A of 6 × 10−15, which is 1.8 times lower than the 95 per cent confidence GWB limit obtained by the Parkes PTA in 2006. Our approach to the data analysis incorporates the multitelescope nature of the European PTA and thus can serve as a useful template for future intercontinental PTA collaborations.</abstract>
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