Univ. of California, Los Angeles, CA (United States)
Univ. of California, Davis, CA (United States)
Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
The mass distribution in massive elliptical galaxies encodes their evolutionary history, thus providing an avenue to constrain the baryonic astrophysics in their evolution. The power-law assumption for the radial mass profile in ellipticals has been sufficient to describe several observables to the noise level, including strong lensing and stellar dynamics. In this paper, we quantitatively constrained any deviation, or the lack thereof, from the power-law mass profile in massive ellipticals through joint lensing–dynamics analysis of a large statistical sample with 77 galaxy–galaxy lens systems. We performed an improved and uniform lens modelling of these systems from archival Hubble Space Telescope imaging using the automated lens modelling pipeline dolphin. We combined the lens model posteriors with the stellar dynamics to constrain the deviation from the power law after accounting for the line-of-sight lensing effects, a first for analyses on galaxy–galaxy lenses. We find that the Sloan Lens ACS Survey lens galaxies with a mean redshift of 0.2 are consistent with the power-law profile within 1.1σ (2.8σ) and the Strong Lensing Legacy Survey lens galaxies with a mean redshift of 0.6 are consistent within 0.8σ (2.1σ), for a spatially constant (Osipkov–Merritt) stellar anisotropy profile. We adopted the spatially constant anisotropy profile as our baseline choice based on previous dynamical observables of local ellipticals. However, spatially resolved stellar kinematics of lens galaxies are necessary to differentiate between the two anisotropy models. Future studies will use our lens models to constrain the mass distribution individually in the dark matter and baryonic components.
Tan, Chin Yi, et al. "Project Dinos I: A joint lensing–dynamics constraint on the deviation from the power law in the mass profile of massive ellipticals." Monthly Notices of the Royal Astronomical Society, vol. 530, no. 2, Mar. 2024. https://doi.org/10.1093/mnras/stae884
Tan, Chin Yi, Shajib, Anowar J., Birrer, Simon, Sonnenfeld, Alessandro, Treu, Tommaso, Wells, Patrick, Williams, Devon, Buckley-Geer, Elizabeth J., Drlica-Wagner, Alex, & Frieman, Joshua (2024). Project Dinos I: A joint lensing–dynamics constraint on the deviation from the power law in the mass profile of massive ellipticals. Monthly Notices of the Royal Astronomical Society, 530(2). https://doi.org/10.1093/mnras/stae884
Tan, Chin Yi, Shajib, Anowar J., Birrer, Simon, et al., "Project Dinos I: A joint lensing–dynamics constraint on the deviation from the power law in the mass profile of massive ellipticals," Monthly Notices of the Royal Astronomical Society 530, no. 2 (2024), https://doi.org/10.1093/mnras/stae884
@article{osti_2563263,
author = {Tan, Chin Yi and Shajib, Anowar J. and Birrer, Simon and Sonnenfeld, Alessandro and Treu, Tommaso and Wells, Patrick and Williams, Devon and Buckley-Geer, Elizabeth J. and Drlica-Wagner, Alex and Frieman, Joshua},
title = {Project Dinos I: A joint lensing–dynamics constraint on the deviation from the power law in the mass profile of massive ellipticals},
annote = {The mass distribution in massive elliptical galaxies encodes their evolutionary history, thus providing an avenue to constrain the baryonic astrophysics in their evolution. The power-law assumption for the radial mass profile in ellipticals has been sufficient to describe several observables to the noise level, including strong lensing and stellar dynamics. In this paper, we quantitatively constrained any deviation, or the lack thereof, from the power-law mass profile in massive ellipticals through joint lensing–dynamics analysis of a large statistical sample with 77 galaxy–galaxy lens systems. We performed an improved and uniform lens modelling of these systems from archival Hubble Space Telescope imaging using the automated lens modelling pipeline dolphin. We combined the lens model posteriors with the stellar dynamics to constrain the deviation from the power law after accounting for the line-of-sight lensing effects, a first for analyses on galaxy–galaxy lenses. We find that the Sloan Lens ACS Survey lens galaxies with a mean redshift of 0.2 are consistent with the power-law profile within 1.1σ (2.8σ) and the Strong Lensing Legacy Survey lens galaxies with a mean redshift of 0.6 are consistent within 0.8σ (2.1σ), for a spatially constant (Osipkov–Merritt) stellar anisotropy profile. We adopted the spatially constant anisotropy profile as our baseline choice based on previous dynamical observables of local ellipticals. However, spatially resolved stellar kinematics of lens galaxies are necessary to differentiate between the two anisotropy models. Future studies will use our lens models to constrain the mass distribution individually in the dark matter and baryonic components.},
doi = {10.1093/mnras/stae884},
url = {https://www.osti.gov/biblio/2563263},
journal = {Monthly Notices of the Royal Astronomical Society},
issn = {ISSN 0035-8711},
number = {2},
volume = {530},
place = {United States},
publisher = {Oxford University Press},
year = {2024},
month = {03}}
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 530; ISSN 0035-8711