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

Published online by Cambridge University Press:  04 March 2024

João Paulo C. França Open the ORCID record for João Paulo C. França [Opens in a new window] ,
Martin Makler Open the ORCID record for Martin Makler [Opens in a new window] ,
Ingrid Beloto Open the ORCID record for Ingrid Beloto [Opens in a new window] ,
Eduardo Cypriano Open the ORCID record for Eduardo Cypriano [Opens in a new window] ,
Renan A. Oliveira Open the ORCID record for Renan A. Oliveira [Opens in a new window] ,
Thiago S. Gonçalves Open the ORCID record for Thiago S. Gonçalves [Opens in a new window]  and
James Nightingale Open the ORCID record for James Nightingale [Opens in a new window]
João Paulo C. França*
Affiliation:
Centro Brasileiro de Pesquisas Fsicas
Martin Makler
Affiliation:
Centro Brasileiro de Pesquisas Fsicas International Center for Advanced Studies & Instituto de Ciencias Fsicas, ECyT-UNSAM & CONICET
Ingrid Beloto
Affiliation:
Instituto de Astronomia, Geofsica e Ciências Atmosféricas, Universidade de São Paulo
Eduardo Cypriano
Affiliation:
Instituto de Astronomia, Geofsica e Ciências Atmosféricas, Universidade de São Paulo
Renan A. Oliveira
Affiliation:
Centro de Ciências Exatas, Universidade Federal do Esprito Santo
Thiago S. Gonçalves
Affiliation:
Observatório do Valongo, Universidade Federal do Rio de Janeiro
James Nightingale
Affiliation:
Department of Physics, Centre for Extragalactic Astronomy, Durham University Department of Physics, Institute for Computational Cosmology, Durham University
*
†joaofranca@cbpf.br
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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, σv. We briefly describe the semi-automated SL modelling of the systems in this sample and combine the results with σv 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.

Keywords

gravitational lensing: strongmethods: data analysisgalaxies: structuretechniques: spectroscopic
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S381: Strong Gravitational Lensing in the Era of Big Data , December 2022 , pp. 31 - 34
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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