Weighing dark matter haloes with gravitationally lensed supernovae - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: High redshift Type Ia supernovae SNe Ia are likely to be gravitationallylensed by dark matter haloes of galaxies in the foreground. Since SNe Ia havevery small dispersion after light curve shape and colour corrections, theirbrightness can be used to measure properties of the dark matter haloes viagravitational magnification. We use observations of galaxies and SNe Ia withinthe Great Observatories Origins Deep Survey GOODS to measure the relationbetween galaxy luminosity and dark matter halo mass. The relation weinvestigate is a scaling law between velocity dispersion and galaxy luminosityin the B-band. The best-fitting values to this relation velocity dispersionnormalisation and exponent are 136 km-s and 0.27. We find the velocitydispersion normalisation to be less than 190 km-s at the 95 per cent confidencelevel. This method provides an independent cross-check of measurements of darkmatter halo properties from galaxy-galaxy lensing studies. Our results agreewith the galaxy-galaxy lensing results, but have much larger uncertainties. TheGOODS sample of SNe Ia is relatively small we include 24 SNe and the resultstherefore depend on individual SNe Ia. We have investigated a number ofpotential systematic effects. Light curve fitting, which affects the inferredbrightness of the SNe Ia, appears to be the most important one. Resultsobtained using different light curve fitting procedures differ at the 68.3 percent confidence level.



Autor: Jakob Jonsson, Tomas Dahlen, Isobel Hook, Ariel Goobar, Edvard Mortsell

Fuente: https://arxiv.org/







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