1,721,017 research outputs found
Some astrophysical implications of dark matter and gas profiles in a new galaxy cluster model
No full textCosmological parameters from lenses distance ratio
No full textStrong lensing provides popular techniques to investigate the mass distribution of intermediate
redshift galaxies, testing galaxy evolution and formation scenarios. It especially probes the
background cosmic expansion, hence constraining cosmological parameters. The measurement
of Einstein radii and central velocity dispersions indeed allows to trace the ratio D_s/D_ls between
the distance D_s from the observer to the source and the distance D_ls from the lens to the source.
We present an improved method to explicitly include the two-component structure in the
galaxy lens modelling, in order to analyse the role played by the redshift and the model
dependence on a nuisance parameter, F_E, which is usually marginalized in the cosmological
applications. We show how to deal with these problems and carry on a Fisher matrix analysis
to infer the accuracy on cosmological parameters achieved by this method
PECULIAR VELOCITIES FIELD AND THE MATTER DENSITY OF THE UNIVERSE IN SCALAR FIELD QUINTESSENCE MODELS
No full textStandardizing the gamma-ray bursts with the Amati Ep,i-Eiso relation: the updated Hubble diagram and implications for cosmography
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