Cosmological parameters from lensed supernovae

Details Cosmological parameters from lensed supernovae Cosmological parameters from lensed supernovae

2002-07-05

arxiv.org/abs/astro-ph/0207139v1

Astron.Astrophys. 393 (2002) 25-32

Astronomy and Astrophysics

Astrophysics

9 pages, 9 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20020987

We investigate the possibility of measuring the Hubble constant, the fractional energy density components and the equation of state parameter of the ``dark energy'' using lensed multiple images of high-redshift supernovae. With future instruments, such as the SNAP and NGST satellites, it will become possible to observe several hundred lensed core-collapse supernovae with multiple images. Accurate measurements of the image separation, flux-ratio, time-delay and lensing foreground galaxy will provide complementary information to the cosmological tests based on, e.g., the magnitude-redshift relation of Type Ia supernovae, especially with regards to the Hubble parameter that could be measured with a statistical uncertainty at the one percent level. Assuming a flat universe, the statistical uncertainty on the mass density is found to be sigma^stat_m <0.05. However, systematic effects from the uncertainty of the lens modeling are likely to dominate. E.g., if the lensing galaxies are extremely compact but are (erroneously) modeled as singular isothermal spheres, the mass density is biased by sigma^syst_m =0.1. We argue that wide-field near-IR instruments such as the one proposed for the SNAP mission are critical for collecting large statistics of lensed supernovae.

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