Tuning Gravitationally Lensed Standard Sirens

Details Tuning Gravitationally Lensed Standard Sirens Tuning Gravitationally Lensed Standard Sirens

2006-11-10

arxiv.org/abs/astro-ph/0611334v1

Astrophys.J.658:52-59,2007

Astronomy and Astrophysics

Astrophysics

21 pages, 4 figures, accepted for publication in ApJ

Scientific paper

10.1086/510832

Gravitational waves emitted by chirping supermassive black hole binaries could in principle be used to obtain very accurate distance determinations. Provided they have an electromagnetic counterpart from which the redshift can be determined, these standard sirens could be used to build a high redshift Hubble diagram. Errors in the distance measurements will most likely be dominated by gravitational lensing. We show that the (de)magnification due to inhomogeneous foreground matter will increase the scatter in the measured distances by a factor ~10. We propose to use optical and IR data of the foreground galaxies to minimize the degradation from weak lensing. We find that the net effect of correcting the estimated distances for lensing is comparable to increasing the sample size by a factor of three when using the data to constrain cosmological parameters.

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