Limits on the Stochastic Gravitational Wave Background from the North American Nanohertz Observatory for Gravitational Waves

Title:
Limits on the Stochastic Gravitational Wave Background from the North American Nanohertz Observatory for Gravitational Waves
Authors:
Demorest, Paul B.; Ferdman, Robert D. ( 0000-0002-2223-1235 ) ; Stinebring, Daniel R.
Abstract:
We present an analysis of high-precision pulsar timing data taken as part of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) project. We have observed 17 pulsars for a span of roughly five years using the Green Bank and Arecibo radio telescopes. We analyze these data using standard pulsar timing models, with the addition of time-variable dispersion measure and frequency-variable pulse shape terms. Sub-microsecond timing residuals are obtained in nearly all cases, and the best rms timing residuals in this set are ~30-50 ns. We present methods for analyzing post-fit timing residuals for the presence of a gravitational wave signal with a specified spectral shape. These optimally take into account the timing fluctuation power removed by the model fit, and can be applied to either data from a single pulsar, or to a set of pulsars to detect a correlated signal. We apply these methods to our data set to set an upper limit on the strength of the nHz-frequency stochastic supermassive black hole gravitational wave background of hc (1 yr–1) < 7 × 10–15 (95%). This result is dominated by the timing of the two best pulsars in the set, PSRs J1713+0747 and J1909–3744.
Citation:
Demorest, P.B., R.D. Ferdman, D. Stinebring, et al. 2013. “Limits on the Stochastic Gravitational Wave Background from the North American Nanohertz Observatory for Gravitational Waves.” The Astrophysical Journal 762(2): 94.
Publisher:
American Astronomical Society / IOP Publishing
DATE ISSUED:
2013
Department:
Physics and Astronomy
Type:
Article
PUBLISHED VERSION:
10.1088/0004-637X/762/2/94
PERMANENT LINK:
http://hdl.handle.net/11282/332521

Full metadata record

DC FieldValue Language
dc.contributor.authorDemorest, Paul B.en
dc.contributor.authorFerdman, Robert D.en
dc.contributor.authorStinebring, Daniel R.en
dc.date.accessioned2014-10-09T12:04:37Zen
dc.date.available2014-10-09T12:04:37Zen
dc.date.issued2013en
dc.identifier.citationDemorest, P.B., R.D. Ferdman, D. Stinebring, et al. 2013. “Limits on the Stochastic Gravitational Wave Background from the North American Nanohertz Observatory for Gravitational Waves.” The Astrophysical Journal 762(2): 94.en
dc.identifier.issn0004-637Xen
dc.identifier.urihttp://hdl.handle.net/11282/332521en
dc.description.abstractWe present an analysis of high-precision pulsar timing data taken as part of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) project. We have observed 17 pulsars for a span of roughly five years using the Green Bank and Arecibo radio telescopes. We analyze these data using standard pulsar timing models, with the addition of time-variable dispersion measure and frequency-variable pulse shape terms. Sub-microsecond timing residuals are obtained in nearly all cases, and the best rms timing residuals in this set are ~30-50 ns. We present methods for analyzing post-fit timing residuals for the presence of a gravitational wave signal with a specified spectral shape. These optimally take into account the timing fluctuation power removed by the model fit, and can be applied to either data from a single pulsar, or to a set of pulsars to detect a correlated signal. We apply these methods to our data set to set an upper limit on the strength of the nHz-frequency stochastic supermassive black hole gravitational wave background of hc (1 yr–1) < 7 × 10–15 (95%). This result is dominated by the timing of the two best pulsars in the set, PSRs J1713+0747 and J1909–3744.en
dc.language.isoen_USen
dc.publisherAmerican Astronomical Society / IOP Publishingen
dc.identifier.doi10.1088/0004-637X/762/2/94en
dc.subject.departmentPhysics and Astronomyen
dc.titleLimits on the Stochastic Gravitational Wave Background from the North American Nanohertz Observatory for Gravitational Wavesen
dc.typeArticleen
dc.identifier.journalAstrophysical Journalen
dc.subject.keywordGravitational wavesen
dc.subject.keywordMethods--Data analysisen
dc.subject.keywordPulsars--Generalen
dc.subject.keywordPulsars--Individualen
dc.identifier.volume762en
dc.identifier.issue2en
dc.identifier.startpage94en
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