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MODELLING OBSERVATIONS FOR RADIO WEAK LENSING

Hartley, Philippa

[Thesis]. Manchester, UK: The University of Manchester; 2013.

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Abstract

Weak gravitational lensing has become an important cosmological probe in recentyears. The deflection of light in the presence of matter is predicted from the solutionsto Einstein’s equations. Observations of resulting lensing effects can be used todetermine the distribution of matter over space, allowing structure to be mapped,and constraining dark energy.In the weak lensing regime, the effects are statistical in nature and many sources arerequired. Even with a large survey area, significant systematic error may remain,arising from intrinsic alignment between galaxies. A new method, developed byresearchers at the Jodrell Bank Centre for Astrophysics, proposes to use polarisationinformation to extract the contaminating signal from intrinsic alignment.The purpose of this thesis is to model observations for weak lensing using a polarisedsky. We begin by giving an overview of the cosmological motivation, before sum-marising the lensing formalism. Finally, we develop a model of extended polarisedsources, and investigate the extraction of inputted ellipticity values from our maps.

Bibliographic metadata

Type of resource:
Content type:
Administered thesis
Form of thesis:
Traditional
Type of submission:
Doctoral level ETD - final
Thesis title:
MODELLING OBSERVATIONS FOR RADIO WEAK LENSING
Degree type:
Master of Science by Research
Degree programme:
MSc by Research in Astronomy and Astrophysics
Publication date:
2013-07-16T11:38:49
Institution:
The University of Manchester
Location:
Manchester, UK
Total pages:
96
Abstract:
Weak gravitational lensing has become an important cosmological probe in recentyears. The deflection of light in the presence of matter is predicted from the solutionsto Einstein’s equations. Observations of resulting lensing effects can be used todetermine the distribution of matter over space, allowing structure to be mapped,and constraining dark energy.In the weak lensing regime, the effects are statistical in nature and many sources arerequired. Even with a large survey area, significant systematic error may remain,arising from intrinsic alignment between galaxies. A new method, developed byresearchers at the Jodrell Bank Centre for Astrophysics, proposes to use polarisationinformation to extract the contaminating signal from intrinsic alignment.The purpose of this thesis is to model observations for weak lensing using a polarisedsky. We begin by giving an overview of the cosmological motivation, before sum-marising the lensing formalism. Finally, we develop a model of extended polarisedsources, and investigate the extraction of inputted ellipticity values from our maps.
Keyword(s):
Thesis main supervisor(s):
Thesis advisor(s):
Degree grantor:
Language:
en

Institutional metadata

University researcher(s):
Academic department(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:201555
Created by:
Hartley, Philippa
Created:
16th July, 2013, 10:38:50
Last modified by:
Hartley, Philippa
Last modified:
14th November, 2013, 13:21:01

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