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Large-scale structures from infrared surveys

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Title: Large-scale structures from infrared surveys
Authors: Wang, Lingyu
Item Type: Thesis or dissertation
Abstract: To use the AKARI All-Sky Survey Point Source Catalogue as a validation sample for future missions such as Planck and to study large-scale structure, we first investigate the AKARI point source detection limit at 90 μm and the nature of bright spurious sources. Due to the degradation of the sensitivity of the AKARI All-Sky Survey and formidable difficulties in filtering out excessive noise, we return to the IRAS Faint Source Catalog to construct a redshift catalogue of over 60,000 galaxies selected at 60 μm, the Imperial IRAS-FSC Redshift Catalogue (IIFSCz). Around 50% of the sources in the IIFSCz have spectroscopic redshifts and a further 20% have photometric redshifts. The luminosity and selection functions are obtained for the IIFSCz flux-limited at 0.36 Jy at 60 μm. The dependence of galaxy clustering on spectral type and luminosity is studied using correlation statistics. A possible detection of the baryon acoustic oscillations in the power spectrum of the flux-limited sample of the IIFSCz is discussed. Finally, we present future research directions which include the FIR-radio correlation, ultraluminous and hyperluminous infrared galaxies, galaxy bias in the SWIRE Photometric Redshift Catalogue and convergence of the cosmological dipole.
Issue Date: Oct-2008
Date Awarded: Jan-2009
URI: http://hdl.handle.net/10044/1/4410
DOI: https://doi.org/10.25560/4410
Supervisor: Rowan-Robinson, Michael
Sponsor/Funder: Dorothy Hodgkin Postgraduate Award
Author: Wang, Lingyu
Department: Physics
Publisher: Imperial College London
Qualification Level: Doctoral
Qualification Name: Doctor of Philosophy (PhD)
Appears in Collections:Physics PhD theses



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