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The last stand before Rubin: semi-automated inverse modelling of galaxy-galaxy strong lensing systems.

Authors :
França, João Paulo C.
Makler, Martin
Beloto, Ingrid
Cypriano, Eduardo
Oliveira, Renan A.
Gonçalves, Thiago S.
Nightingale, James
Source :
Proceedings of the International Astronomical Union. Dec2022, Vol. 18 Issue S381, p31-34. 4p.
Publication Year :
2022

Abstract

Galaxy-galaxy strong lensing (SL) systems provide a unique opportunity to test modified gravity theories. Deviations from General Relativity are encoded in the post-Newtonian parameter (γ). As a preparation for the upcoming data from the Vera Rubin Observatory Legacy Survey of Space and Time (LSST), our research group collected imaging data of SL systems from ground-based telescopes and conducted spectroscopic observations of 21 systems on the Southern Astrophysical Research (SOAR) Telescope to measure the lens velocity dispersions, σ v . We briefly describe the semi-automated SL modelling of the systems in this sample and combine the results with σ v from SOAR to derive an estimate for γ. Our preliminary results yield a value of $$\gamma = 1.17_{ - 0.33}^{ + 0.29}$$ , which is consistent with General Relativity. Although the error bars are limited by the sample size, this result represents the first constraint on modified gravity obtained purely from ground-based data, with a sample completely independent from previous studies, and which allows for a self consistent end-to-end analysis. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
17439213
Volume :
18
Issue :
S381
Database :
Academic Search Index
Journal :
Proceedings of the International Astronomical Union
Publication Type :
Academic Journal
Accession number :
175799009
Full Text :
https://doi.org/10.1017/S1743921323004222