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Joint lensing–dynamics constraint on the elliptical galaxy mass profile from the largest galaxy–galaxy lens sample

Published online by Cambridge University Press:  04 March 2024

Chin Yi Tan Open the ORCID record for Chin Yi Tan [Opens in a new window]  and
Anowar Shajib Open the ORCID record for Anowar Shajib [Opens in a new window]
Chin Yi Tan*
Affiliation:
Department of Physics, University of Chicago, Chicago, IL 60637, USA. Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA
Anowar Shajib
Affiliation:
Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL 60637, USA Department of Astronomy & Astrophysics, The University of Chicago, Chicago, IL 60637, USA
*
email: [email protected]
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Abstract

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From various lensing and non-lensing observations, the total density profile in elliptical galaxies is well approximated by a power law mass distribution. However, as neither the dark matter nor the baryons individually follow the power law, this observational result has been referred to as the “bulge–halo conspiracy”. We investigate the consistency of this conspiracy with higher precision than previous studies with the largest ever sample of galaxy–galaxy lenses assembled from archival Hubble Space Telescope (HST) data. By performing lens modelling with power law profiles and combining them with stellar dynamics using the mass-sheet transformation, we can constrain the profile’s deviation from the power law model over a redshift range of 0.1 to 0.8. To uniformly model such a large sample of lens models, we use the automated modelling pipeline dolphin. We also investigate the evolutionary trend of the total mass density slope of the lensing galaxies.

Keywords

gravitational lensinggalaxies: elliptical and lenticularcD
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S381: Strong Gravitational Lensing in the Era of Big Data , December 2022 , pp. 23 - 27
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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