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Evolution of total density slopes of cluster galaxies using integral field spectroscopy

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posted on 28.03.2022, 19:25 by Caro Elsa Derkenne
The change of the total mass density slope, γ, of early-type galaxies through cosmic time is a probe of evolutionary pathways. A trend towards steeper slopes with greater lookback time indicates the predominance of gas-poor mergers, whilst more shallow slopes with greater lookback times point to gas-rich mergers. Gravitational lensing observations at redshifts up to z ∼ 1 lend strength to a gas-rich merger scenario, which is in tension with hydrodynamical cosmological simulation predictions of gas-poor minor mergers being fundamental to galaxy mass growth after z ∼ 2. At redshift zero, isothermal solutions are obtained by both simulations and dynamical modelling. This work extends the dynamical modelling technique to intermediate redshifts (0.3 < z < 0.55) in order to derive density slopes, combining two-dimensional kinematic fields from MUSE data with photometry from the Hubble Space Telescope. The density slopes of 50 galaxies from the Frontier Fields project, majority early-type, are presented. A linear evolution in the slope of dγ/dz = −0.34 ± 0.18 is found, supporting a picture of galaxy growth via gas-poor minor mergers.


Table of Contents

1 Introduction -- 2 Data Sample -- 3 Stellar kinematics -- 4 Photometry -- 5 Stellar dynamical modelling -- 6 Magneticum simulation galaxy modelling -- 7 Results and discussion -- 8 Conclusions.


Bibliography pages Theoretical thesis.

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


MRes, Macquarie University, Faculty of Science and Engineering, Department of Physics and Astronomy

Department, Centre or School

Department of Physics and Astronomy

Year of Award


Principal Supervisor

Richard McDermid


Copyright 2019




1 online resource (viii, 75 pages) illustrations

Former Identifiers

mq:72348 http://hdl.handle.net/1959.14/1283945