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Cosmic giants on cosmic scales

Lieu, Maggie (2016)
Ph.D. thesis, University of Birmingham.

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Abstract

Galaxy groups and clusters are cosmic giants. They are the largest observable virialised objects that have materialised from the initial perturbations in the early Universe. These systems comprise of not only galaxies, but also hot gas and dark matter. They are ideal astrophysical laboratories to study the matter distribution of the Universe and cluster physics whilst their distribution and evolution can be used constrain cosmological parameters. Clusters are the ultimate test for the structure formation paradigm. However, for this to be achieved requires knowledge of their mass which is a particularly challenging task since there are no ‘cosmic scales’ to directly measure the masses of these objects.
Groups and clusters are massive enough to gravitationally influence light emitted from background galaxies, an effect known as gravitational lensing. Its mass can be inferred from the strength of the weak lensing signal and is only dependent on the gravitational potential well depth. However, its limitations arise from systematic uncertainties of shape measurement, photometric redshift and shallow survey depth. This thesis concerns constraining accurate and precise cluster mass estimates of low mass groups and poor clusters, and testing the limits that can be achieved with current noisy, ground-based data.

Type of Work:Ph.D. thesis.
Supervisor(s):Ponman, Trevor and Farr, Will
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy, Astrophysics and Space Research Group
Additional Information:

M. Lieu, G. P. Smith, P. Giles, F. Ziparo, B. Maughan, J. Democles, F. Pacaud, M. Pierre, C. Adami, Y. M. Bahe et al. (2015) The XXL Survey. IV. Mass-temperature relation of the bright cluster sample. A&A.
http://dx.doi.org/10.1051/0004-6361/201526883

Subjects:QB Astronomy
QC Physics
Institution:University of Birmingham
ID Code:6767
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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