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Lensing magnification of supernovae in the GOODS-fields | | Jakob Jonsson
; Tomas Dahlen
; Ariel Goobar
; Christofer Gunnarsson
; Edvard Mortsell
; Kyoungsoo Lee
; | | Date: |
30 Jun 2005 | | Subject: | astro-ph | | Abstract: | Gravitational lensing of high-redshift supernovae is potentially an important source of uncertainty when deriving cosmological parameters from the measured brightness of Type Ia supernovae, especially in deep, low statistics surveys. Photometric and spectroscopic measurements of foreground galaxies along the lines-of-sight of 33 supernovae discovered with the Hubble Space Telescope, both core-collapse and Type Ia, are used to model the magnification probability distributions of the sources. Modelling galaxy halos with SIS or NFW-profiles and using M/L scaling laws provided by the Faber-Jackson and Tully-Fisher relations, we find clear evidence for supernovae with lensing (de)magnification. However, the magnification distribution of the Type Ia supernovae used to determine cosmological distances matches very well the expectations for an unbiased sample, i.e. their mean magnification factor is consistent with unity, the filled-beam value for an homogeneous universe. Our results show that the lensing distortions of the supernova brightness are well understood for the GOODS sample and that correcting for this effect has a negligible impact on the derived cosmological parameters. | | Source: | arXiv, astro-ph/0506765 | | Services: | Forum | Review | PDF | Favorites | |
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