Gravitational lensing of the farthest known supernova SN1997ff
Authors: Edvard Moertsell, Christofer Gunnarsson, Ariel Goobar
AI-generated Key Points
- Gravitational lensing effects on Type Ia supernova SN1997ff investigated
- Adjusting mass and velocity dispersion of lensing galaxies allows for a wide range of magnifications
- Main objective is to constrain the redshift-distance relation using SN1997ff
- Detailed modeling of intervening galaxies necessary to control for systematic effects from gravitational lensing
- Current limited knowledge about lensing galaxies makes it challenging to accurately determine values of Omega_M and Omega_Lambda, grey dust obscuration, or luminosity evolution in Type Ia supernovae
- Understanding and accounting for gravitational lensing effects is crucial when using distant supernovae as cosmological probes
- More comprehensive modeling techniques and improved knowledge about intervening galaxies needed for accurate measurements and meaningful conclusions about fundamental cosmological parameters.
Abstract: We investigate the effects of gravitational lensing due to intervening galaxies on the recently discovered Type Ia supernova at z=1.7, SN1997ff, in the Hubble Deep Field North. We find that it is possible to obtain a wide range of magnifications by varying the mass and/or the velocity dispersion normalization of the lensing galaxies. In order to be able to use SN1997ff to constrain the redshift-distance relation, very detailed modeling of the galaxies to control the systematic effects from lensing is necessary. Thus we argue, that based on our current limited knowledge of the lensing galaxies, it is difficult to use SN1997ff to constrain the values of Omega_M and Omega_Lambda, or even to place severe limits on grey dust obscuration or luminosity evolution of Type Ia supernovae.
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