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X-ray properties of early-type galaxies

O'Sullivan, Ewan (2002)
Ph.D. thesis, University of Birmingham.

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Abstract

It has been known for some time that many early–type galaxies possess halos of X–ray emitting gas. However, the properties of these halos and the processes by which they form are as yet not well understood. We have compiled the largest catalogue of X–ray luminosities to date, and use it to examine the relationships between X–ray luminosity and galaxy age, environment and optical luminosity. It is shown that the mass of the X–ray halo increases with galaxy age, and that there is no trend in LX/LBwith environment. Group dominant galaxies are shown to be more X–ray luminous than galaxies in other environments, and the effect of this on the LX:LBrelation is explored. A smaller sample of highly X–ray luminous galaxies is studied in more detail, and their properties compared to those of galaxy groups and clusters. It is shown that while galaxy halos are similar to those of larger structures they differ in that their surface brightness profiles do not vary with system temperature. It is also shown that early–type galaxies have lower gas fractions than groups and clusters, probably owing to gas loss from the system through galaxy winds.

Type of Work:Ph.D. thesis.
Supervisor(s):Ponman, Trevor
School/Faculty:Schools (1998 to 2008) > School of Physics & Astronomy
Department:Astrophysics and Space Research Group
Subjects:QB Astronomy
Institution:University of Birmingham
Library Catalogue:Check for printed version of this thesis
ID Code:76
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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