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- W4317361152 endingPage "1629" @default.
- W4317361152 startingPage "1613" @default.
- W4317361152 abstract "General Relativity (GR) has been successfully tested mainly at Solar system scales; however, galaxy-scale tests have become popular in the last few decades. In this work, we investigate the $eta_text{PPN}$ parameter, which is commonly defined by the ratio of two scalar potentials that appears in the cosmological linearly perturbed metric. Under the assumption of GR and a vanish anisotropic stress tensor, $eta_text{PPN}= 1$. Using ALMA, HST, and VLT/MUSE data, we combine mass measurements, using gravitational lensing and galactic dynamics, for the SDP.81 lens galaxy ($z = 0.299$) to constrain $eta_text{PPN}$. By using a flexible and self-consistent mass profile, our fiducial model takes into account the contribution of the stellar mass and a dark matter halo to reconstruct the lensed galaxy and the spatially-resolved stellar kinematics. We infer, after accounting for systematic uncertainties related to the mass model, cosmology and kinematics, $eta_{text{PPN}} = 1.13^{+0.03}_{-0.03}pm0.20,(text{sys})$, which is in accordance with GR predictions. Better spectroscopy data are needed to push the systematics down and bring the uncertainty to the percentage level since our analysis shows that the main source of the systematics is related to kinematics, which heavily depends on the signal-to-noise ratio of the spectra." @default.
- W4317361152 created "2023-01-19" @default.
- W4317361152 creator A5038880723 @default.
- W4317361152 creator A5056825025 @default.
- W4317361152 creator A5059056993 @default.
- W4317361152 date "2023-01-18" @default.
- W4317361152 modified "2023-10-15" @default.
- W4317361152 title "Probing general relativity in galactic scales at z ∼ 0.3" @default.
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