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Accounting for population-level systematic effects using a hierarchical strategy

Published online by Cambridge University Press:  04 March 2024

Matthew R. Gomer Open the ORCID record for Matthew R. Gomer [Opens in a new window]
Matthew R. Gomer*
Affiliation:
University of Liège
*
email: [email protected]
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Abstract

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One of the largest sources of systematics in time-delay cosmography arises from Mass Sheet Transformation (MST). The degeneracy associated with this transformation is often broken by an assumed profile shape, such as a power-law. A hierarchical strategy has been developed which constrains the global profile shape on a population level, constrained collectively by the kinematics measurements of the lenses. This framework allows one to include non-time-delay lenses to provide constraints to the global profile, improving the H0 constraints. This work tests the hierarchical framework using analytical profiles, and additionally tests the capacity to combine two populations which come from the same profiles but probe different radii due to a change in source redshift. We find that the hierarchical framework is able to compensate for this effect, and the addition of non-time-delay lenses improves the H0 constraint, even though these lenses have different Einstein radii than their time-delay counterparts.

Keywords

Gravitational lensing: strongcosmological parametersGalaxies: statistics
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S381: Strong Gravitational Lensing in the Era of Big Data , December 2022 , pp. 125 - 130
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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