Large-scale structures from infrared surveys
Author(s)
Wang, Lingyu
Type
Thesis
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.
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.
Date Issued
2008-10
Date Awarded
2009-01
Copyright Statement
Attribution NoDerivatives 4.0 International Licence (CC BY-ND)
Advisor
Rowan-Robinson, Michael
Sponsor
Dorothy Hodgkin Postgraduate Award
Creator
Wang, Lingyu
Publisher Department
Physics
Publisher Institution
Imperial College London
Qualification Level
Doctoral
Qualification Name
Doctor of Philosophy (PhD)