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Effects Of Large-Scale Structure Upon The Determination Of Ho From Time Delays

Published online by Cambridge University Press:  25 May 2016

G.C. Surpi ,
D.D. Harari  and
J.A. Frieman
G.C. Surpi
Affiliation:
Departamento de Física, FCEyN, Universidad de Buenos Aires, Ciudad Universitaria - Pab. 1, 1428 Buenos Aires, Argentina
D.D. Harari
Affiliation:
Departamento de Física, FCEyN, Universidad de Buenos Aires, Ciudad Universitaria - Pab. 1, 1428 Buenos Aires, Argentina
J.A. Frieman
Affiliation:
NASA/Fermilab Astrophysical Center, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510, USA

Abstract

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We have analyzed the effects of both large-scale inhomogeneities in the mass distribution and cosmological gravitational waves upon the time delay between two images in a gravitational lens system. We have shown that their leading order effect, which could potentially bias the determination of the Hubble parameter, is indistinguishable from a change in the relative angle between the source and the lens axis. Since the absolute angular position of the source is not directly measurable, nor does it enter the relationship between the Hubble parameter and the lens observables, the determination of Ho from gravitational lens time delays follows in the usual way, as if the metric perturbations were absent.

Type
Chapter 3: Large Scale Structure
Information
Symposium - International Astronomical Union , Volume 173: Astrophysical Applications of Gravitational Lensing , 1996 , pp. 91 - 92
Copyright
Copyright © Kluwer 1996 

References

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