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