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Issue A&A Volume 397, Number 3, January III 2003 Page(s) 819 - 823 Section Extragalactic astronomy DOI 10.1051/0004-6361:20021547

A&A 397, 819-823 (2003)
DOI: 10.1051/0004-6361:20021547

Correcting for lensing bias in the Hubble diagram

R. Amanullah, E. Mörtsell and A. Goobar

Physics Department, Stockholm University, SCFAB, 106 91 Stockholm, Sweden
(Received 19 April 2002 / Accepted 23 October 2002 )

Abstract
Gravitational lensing will cause a dispersion in the Hubble diagram for high redshift sources. This effect introduces a bias in the cosmological parameter determination using the distance-redshift relation for type Ia supernovae. In this note we show how one can diagnose and correct for this bias when doing precision cosmology with supernovae.

Key words: gravitational lensing -- cosmological parameters -- methods: statistical

Offprint request: R. Amanullah, rahman@physto.se

© ESO 2003

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