2010MNRAS.404..858S -
Mon. Not. R. Astron. Soc., 404, 858-866 (2010/May-2)
Delensing gravitational wave standard sirens with shear and flexion maps.
SHAPIRO C., BACON D.J., HENDRY M. and HOYLE B.
Abstract (from CDS):
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.
Abstract Copyright:
© 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s):
gravitational lensing - gravitational waves - distance scale
Simbad objects:
1
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