Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597348
Title: Characterising ultraluminous infrared galaxies in the early universe
Author: Casey, C. M.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2010
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Abstract:
This thesis aims to reduce the effect of selection bias on the understanding of high-z ULIRGs by characterising a population of submillimetre-faint star forming radio galaxies (SFRGs). SFRGs have similarly high star formation rates as SMGs, but I present evidence in this thesis that SFRGs are overall less bolometrically luminous, contain a slightly higher fraction of emission from Active Galactic Nuclei (AGN), and that there is a lack of hotter-dust (>60 K) SFRGs at the highest bolometric luminosities (>1013L⊙). In Chapter 2 I present a population of SFRGs which are 70μm-luminous, showing that they are star formation dominated and have hotter dust temperatures than SMGs of similar luminosities and redshifts. Chapter 3 presents high-resolution MERLIN radio imaging of two z ~ 2 SFRGs who were originally thought to be star formation dominated, but the MERLIN radio imaging combined with a multiwavelength study shows that the systems are actually evolved, low-luminosity AGN. This highlights the usefulness of MERLIN radio observations in breaking degeneracies and characterising galaxies. Chapter 4 presents neutral carbon observations of a set of z ~ 4 SMGs; neutral carbon provides an independent measurement of a galaxy’s star-forming gas reservoir. This serves as a pilot study for future Atacama Large Millimeter Array (ALMA) observations of large samples of high-z ULIRGs.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.597348  DOI: Not available
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