Papers › Time Delay Cosmography: Analysis of Quadruply Lensed QSO SDSSJ1433 from Wendelstein Observatory
Time Delay Cosmography: Analysis of Quadruply Lensed QSO SDSSJ1433 from Wendelstein Observatory
G. Queirolo, S. Seitz, A. Riffeser, M. Kluge, R. Bender, C. Gössl, U. Hopp, C. Ries, M. Schmidt, R. Zöller
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The goal of this work is to obtain a Hubble constant estimate through the study of the quadruply lensed, variable QSO SDSSJ1433+6007. To achieve this we combine multi-filter, archival HST data for lens modelling and a dedicated time delay monitoring campaign with the 2.1m Fraunhofer telescope at the Wendelstein Observatory. The lens modelling is carried out with the public lenstronomy Python package for each of the filters individually. Through this approach, we find that the data in one of the HST filters (F160W) contain a light contaminant, that would, if remained undetected, have severely biased the lensing potentials and thus our cosmological inference. After rejecting these data we obtain a combined posterior for the Fermat potential differences from the lens modelling in the remaining filters (F475X, F814W, F105W and F140W) with a precision of ∼6%. The analysis of the g′-band Wendelstein light curve data is carried out with a free-knot spline fitting method implemented in the public Python PyCS3 tools. The precision of the time delays between the QSO images has a range between 7.5 and 9.8% depending on the brightness of the images and their time delay. We then combine the posteriors for the Fermat potential differences and time delays. Assuming a flat ΛCDM cosmology, we infer a Hubble parameter of H₀=76.6^(+7.7)_(-7.0)km/(Mpc s), reaching 9.6% uncertainty for a single system.
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