Journal
PHYSICAL REVIEW D
Volume 81, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.124031
Keywords
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Funding
- European Union FEDER funds
- Spanish Ministry of Science and Education [FPA2007-60220, HA2007-0042, CSD2009-00064]
- Govern de les Illes Balears, Conselleria d'Economia, Hisenda i Innovacion
- Science and Technology Facilities Council, UK [PP/F001096/1]
- Netherlands Organisation for Scientific Research (NWO)
- Science and Technology Facilities Council [ST/G504284/1, PP/F001096/1] Funding Source: researchfish
- STFC [ST/G504284/1, PP/F001096/1] Funding Source: UKRI
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The Laser Interferometer Space Antenna's (LISA's) observation of supermassive binary black holes (SMBBH) could provide a new tool for precision cosmography. Inclusion of subdominant signal harmonics in the inspiral signal allows for high-accuracy sky localization, dramatically improving the chances of finding the host galaxy and obtaining its redshift. A SMBBH merger can potentially have component masses from a wide range (10(5)-10(8) M-circle dot) over which parameter accuracies vary considerably. We perform an in-depth study in order to understand (i) what fraction of possible SMBBH mergers allow for sky localization, depending on the parameters of the source, and (ii) how accurately w can be measured when the host galaxy can be identified. We also investigate how accuracies on all parameters improve when a knowledge of the sky position can be folded into the estimation of errors. We find that w can be measured to within a few percent in most cases, if the only error in measuring the luminosity distance is due to LISA's instrumental noise and the confusion background from Galactic binaries. However, weak lensing-induced errors will severely degrade the accuracy with which w can be obtained, emphasizing that methods to mitigate weak lensing effects would be required to take advantage of LISA's full potential.
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