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Improved analysis of GW150914 using a fully spin-precessing waveform model

Citation

Abbott, BP and Abbott, R and Siellez, K and Zlochower, Y, LIGO Scientific Collaboration and Virgo Collaboration, Improved analysis of GW150914 using a fully spin-precessing waveform model, Physical Review X, 6, (4) pp. 041014. ISSN 2160-3308 (2016) [Refereed Article]


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DOI: doi:10.1103/PhysRevX.6.041014

Abstract

This paper presents updated estimates of source parameters for GW150914, a binary black-hole coalescence event detected by the Laser Interferometer Gravitational-wave Observatory (LIGO) in 2015 [Abbott et al. Phys. Rev. Lett. 116, 061102 (2016).]. Abbott et al. [Phys. Rev. Lett. 116, 241102 (2016).] presented parameter estimation of the source using a 13-dimensional, phenomenological precessing-spin model (precessing IMRPhenom) and an 11-dimensional nonprecessing effective-onebody (EOB) model calibrated to numerical-relativity simulations, which forces spin alignment (nonprecessing EOBNR). Here, we present new results that include a 15-dimensional precessing-spin waveform model (precessing EOBNR) developed within the EOB formalism. We find good agreement with the parameters estimated previously [Abbott et al. Phys. Rev. Lett. 116, 241102 (2016).], and we quote updated component masses of 35+5−3M and 30+3−4 M (where errors correspond to 90% symmetric credible intervals). We also present slightly tighter constraints on the dimensionless spin magnitudes of the two black holes, with a primary spin estimate < 0.65 and a secondary spin estimate < 0.75 at 90% probability. Abbott et al. [Phys. Rev. Lett. 116, 241102 (2016).] estimated the systematic parameter-extraction errors due to waveform-model uncertainty by combining the posterior probability densities of precessing IMRPhenom and nonprecessing EOBNR. Here, we find that the two precessing-spin models are in closer agreement, suggesting that these systematic errors are smaller than previously quoted.

Item Details

Item Type:Refereed Article
Keywords:gravitational waves, binary stars, astronomical black holes, gravitational wave detectors, astrophysics, cosmology
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:General relativity and gravitational waves
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Siellez, K (Dr Karelle Siellez)
ID Code:150198
Year Published:2016
Web of Science® Times Cited:93
Deposited By:Physics
Deposited On:2022-06-01
Last Modified:2022-06-01
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