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Distribution of matter in clusters of galaxies

Liang, Haida

Description

We present observations of the Sunyaev-Zel'dovich effect in 5 clusters of galaxies with a Fourier synthesis telescope - the Australia Telescope. A synthesis telescope has the advantage of simultaneously imaging the discrete radio sources and the Sunyaev-Zel'dovich effect. Observations were made at 8.8 GHz and in an ultra-compact 122.4m array configuration. Extended emission either due to radio halo sources or a blend of weak radio sources below the detection threshold, limited our ability...[Show more]

dc.contributor.authorLiang, Haida
dc.date.accessioned2017-12-05T03:26:16Z
dc.date.available2017-12-05T03:26:16Z
dc.date.copyright1995
dc.identifier.otherb1945349
dc.identifier.urihttp://hdl.handle.net/1885/136829
dc.description.abstractWe present observations of the Sunyaev-Zel'dovich effect in 5 clusters of galaxies with a Fourier synthesis telescope - the Australia Telescope. A synthesis telescope has the advantage of simultaneously imaging the discrete radio sources and the Sunyaev-Zel'dovich effect. Observations were made at 8.8 GHz and in an ultra-compact 122.4m array configuration. Extended emission either due to radio halo sources or a blend of weak radio sources below the detection threshold, limited our ability to detect the SZ effect. However, upper limits to the SZ effect obtained for the cluster MS2137-23 was useful in constraining the cluster gas temperature when combined with the X-ray measurements and gravitational lensing constraints. The advantages of a multi-wavelength analysis of cluster mass density distributions and the properties of the intra-cluster medium were demonstrated through the examples of MS2137-23 and Abell 2218. Both clusters possess a giant arc that constrains the cluster central mass. In the case of Abell 2218 where there is a large amount of good data available in various wave-bands, we combined gravitational lensing constraints, optical photometry, measurements of the Sunyaev-Zel'dovich effect, X-ray surface brightness and temperature to constrain the cluster potential. H₀ and test the usual assumptions of mass-follows- light and hydrostatic equilibrium.
dc.format.extentxiv, 191 p.
dc.language.isoen
dc.subject.lcshGalaxies Clusters
dc.subject.lcshDark matter (Astronomy)
dc.subject.lcshX-ray astronomy
dc.titleDistribution of matter in clusters of galaxies
dc.typeThesis (PhD)
local.contributor.supervisorEkers, Ron
dcterms.valid1995
local.description.notesThesis (Ph.D.)--Australian National University, 1995. This thesis has been made available through exception 200AB to the Copyright Act.
local.type.degreeDoctor of Philosophy (PhD)
dc.date.issued1995
local.identifier.doi10.25911/5d70ed18d16cc
dc.date.updated2017-11-22T22:12:25Z
local.mintdoimint
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