Delensing gravitational wave standard sirens with shear and flexion maps

Shapiro, C., Bacon, D., Hendry, M.A. and Hoyle, B. (2010) Delensing gravitational wave standard sirens with shear and flexion maps. Monthly Notices of the Royal Astronomical Society, 404(2), pp. 858-866. (doi: 10.1111/j.1365-2966.2010.16317.x)

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Supermassive black hole binary (SMBHB) systems are standard sirens – the gravitational wave analogue of standard candles – and if discovered by gravitational wave detectors, they could be used as precise distance indicators. Unfortunately, gravitational lensing will randomly magnify SMBHB signals, seriously degrading any distance measurements. Using a weak lensing map of the SMBHB line of sight, we can estimate its magnification and thereby remove some uncertainty in its distance, a procedure we call ‘delensing’. We find that delensing is significantly improved when galaxy shears are combined with flexion measurements, which reduce small-scale noise in reconstructed magnification maps. Under a Gaussian approximation, we estimate that delensing with a 2D mosaic image from an Extremely Large Telescope could reduce distance errors by about 25–30 per cent for an SMBHB at z= 2. Including an additional wide shear map from a space survey telescope could reduce distance errors by nearly a factor of 2. Such improvement would make SMBHBs considerably more valuable as cosmological distance probes or as a fully independent check on existing probes

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hendry, Professor Martin
Authors: Shapiro, C., Bacon, D., Hendry, M.A., and Hoyle, B.
Subjects:Q Science > QB Astronomy
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Monthly Notices of the Royal Astronomical Society
Publisher:Wiley-Blackwell Publishing Ltd.
ISSN (Online):1365-2966
Published Online:22 February 2010

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
459312Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/I001085/1Physics and Astronomy