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Title: The local galaxy density field and its effects on the cosmic microwave background
Author: Francis, Caroline
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2008
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This thesis presents a reconstruction of the local galaxy density field to zmax = 0.3 from a photometric galaxy catalogue based on the Two Micro All-Sky Survey (2MASS) Extended Source Catalogue (XSC). A Wiener filter approach is adopted for the reconstruction, which is carried out using a basis of spherical harmonics to describe angular variations and spherical Bessel functions to describe the radial part of the field. The angular resolution is fixed with max  = 30 (Δθ ~ 6°) and the radial resolution is set to match this at the characteristic redshift of the survey, z ~ 0.1, resulting in Δr ~ 30 h-1Mpc. A novel technique for replacing missing information from the galactic plane is developed and tested using simulation data. This reconstruction is used to predict the contribution to the Cosmic Microwave Background (CMB) of the local Integrated Sachs-Wolfe (ISW) effect and large-scale thermal Sunyaev-Zel’dovich (tSZ) effect. The impact of the predicted local ISW effect on the observed CMB signal is investigated, particularly with regard to reported anomalies on large angular scales. It is found that this local ISW signal to zmax = 0.3 can alleviate these anomalies by altering the amplitudes and positions of significant temperature extrema.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available