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Systematic Errors Induced by the Elliptical Power-law model in Galaxy–Galaxy Strong Lens Modeling

Research in Astronomy and Astrophysics 2022年第2期22卷 143-172页

作者： Xiaoyue Cao Ran Li J.W.Nightingale Richard Massey Andrew Robertson Carlos SFrenk Aristeidis Amvrosiadis nicola camorisco Qiuhan He Amy Etherington Shaun Cole Kai Zhu National Astronomical Observatories Chinese Academy of Sciences20A Datun RoadChaoyang DistrictBeijing 100012China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Institute for Computational Cosmology Physics DepartmentDurham UniversitySouth RoadDurhamDH13LEUnited Kingdom

The elliptical power-law model of the mass in a galaxy is widely used in strong gravitational lensing ***,the distribution of mass in real galaxies is more *** quantify the biases due to this model mismatch by simulating and then analyzing mock Hubble Space Telescope imaging of lenses with mass distributions inferred from SDSS-Ma NGA stellar dynamics *** find accurate recovery of source galaxy morphology,except for a slight tendency to infer sources to be more compact than their true *** Einstein radius of the lens is also robustly recovered with 0.1%accuracy,as is the global density slope,with 2.5%relative systematic error,compared to the 3.4%intrinsic ***,asymmetry in real lenses also leads to a spurious fitted"external shear"with typical strengthγext=***,time delays inferred from lens modeling without measurements of stellar dynamics are typically underestimated by~5%.Using such measurements from a sub-sample of 37 lenses would bias measurements of the Hubble constant H0 by~9%.Although this work is based on a particular set of Ma NGA galaxies,and the specific value of the detected biases may change for another set of strong lenses,our results strongly suggest the next generation cosmography needs to use more complex lens mass models.

关键词： galaxies:structure galaxies:halos gravitational lensing:strong

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