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Impact of Galaxy Dynamics on Modified Gravity Constraints from Strong Lensing Systems

Published online by Cambridge University Press:  04 March 2024

Grasiele Romanzini-Bezerra Open the ORCID record for Grasiele Romanzini-Bezerra [Opens in a new window] ,
Martin Makler  and
Cristina Furlanetto
Grasiele Romanzini-Bezerra*
Affiliation:
Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil.
Martin Makler
Affiliation:
Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil. ICIFI, Universidad Nacional de San Martín, Provincia de Buenos Aires, Argentina
Cristina Furlanetto
Affiliation:
Universidade Federal do Rio Grande Sul, Porto Alegre, Brazil
*
email: [email protected]
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Abstract

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Galaxy-galaxy strong lensing systems have been used in literature to test General Relativity by constraining the post-Newtonian parameter (γPPN). Nevertheless, these methods are prone to systematic errors, some of which arise from difficulties in modelling the dynamics of the lens galaxy. In this study, we address the systematic error related to the assumption of a constant anisotropy between the radial and tangential components of the velocity dispersion of stars within the lens galaxy, characterised by the parameter β. We considered two radial models for the anisotropy parameter, the Osipkov-Merritt and Mamon & Lokas, as well three Gaussian priors for constant β. Our analysis showed that the choice of β has a strong impact on the value of γPPN, with radial models leading to lower values of this parameter.

Keywords

Strong lensinggalaxies
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. 135 - 137
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

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