NDLTD logo NDLTD Union Catalog and Global ETD Search

Global ETD Search

Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.

Results

Showing 1 to 20 of 104 for “"High-redshift"”.

  1. Quasars at the High Redshift Frontier

    Bosman, Sarah Elena IvanaUniversity of Cambridge2017

    … observations and powerful numerical simulations. High-redshift quasars have become a ubiquitous tool in the study of this era with more than 115 quasars now spectroscopically confirmed at z>6.0. In this thesis, I use spectra of high-redshift quasars to provide improved observational constraints …

    cambridge Repository record

  2. Molecular observations of the high redshift universe

    Jarugula, SreevaniUniversity of Illinois at Urbana-Champaign2022

    Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms

    uiuc Repository record

  3. THE ABSORPTION LINE SPECTRA OF HIGH REDSHIFT QSOS

    Coleman, Gary Dean, 1951-The University of Arizona.1978

    arizona-thes Repository record

  4. Probing the Intergalactic Medium with high-redshift quasars

    Calverley, Alexander PeterUniversity of Cambridge2011

    … thermal state of the IGM. In this thesis, I use high-resolution quasar spectra in conjunction with state-of-the-art hydrodynamical simulations to probe the IGM at high redshift, focusing on the ionization and thermal state of the gas. After reionization, the ionization state of the IGM is set by …

    cambridge Repository record

  5. High redshift star-forming galaxies in absorption and emission

    Quider, Anna MarieUniversity of Cambridge2011

    Galaxies in the redshift range 1 < z < 3 existed during the most vigorous period of star formation in the history of the Universe. In the past 15 years, large rest-frame UV spectroscopic samples of z ∼ 3 star-forming galaxies have been assembled. However, this particular redshift range, the …

    cambridge Repository record

  6. Search for rapidly star-forming galaxies at high redshift.

    Elston, Richard Joseph.The University of Arizona.1988

    … found. From this sample it appears this possible high redshift star forming phase only contributes 1/10 of the metal present in disks or spheroids. We have also found 30 Lyman α emission line companions to 12 z = 3 quasars. These objects have Lyman α equivalent widths (50Å) and luminosities (V = …

    arizona-thes Repository record

  7. Unveiling the epoch of reionization by simulations and high-redshift galaxies

    Hutter, AnneUniversität Potsdam

    … of the first stars and galaxies; a fraction of high-energy photons emitted from galaxies permeate into the intergalactic medium (IGM) and gradually ionize the hydrogen, until the IGM is completely ionized at z~6 (Fan et al., 2006). While the progress of reionization is driven by galaxy …

    potsdam-diss Repository record

  8. The high-redshift clusters occupied by bent radio AGN (COBRA) survey

    Golden-Marx, Emmet Gabriel2020

    … and galaxies. To understand how massive, low-redshift galaxy clusters evolve to become what is observed in the modern universe, astronomers need to trace the evolution of progenitor clusters. Though there are thousands of well-studied low-redshift clusters, there are significantly fewer …

    bu Repository record

  9. Unveiling gravitationally lensed, high-redshift dusty star forming galaxies with JWST

    Phadke, Kedar A.University of Illinois at Urbana-Champaign2024

    Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01

    uiuc Repository record

  10. Intergalactic baryon enrichment and implications for galaxy evolution at high redshift

    Cooper, Thomas (Thomas J.), Ph. D. Massachusetts Institute of TechnologyMassachusetts Institute of Technology2018

    … of heavy element absorber characteristics at high redshift, gauging properties of diffuse intra- and intergalactic gas in the first several Gyr of the Universe. At z ~ 3.5, we study chemical abundances of Lyman limit systems (LLSs) and evaluate their potential to represent expected reservoirs …

    mit Repository record

  11. The evolution of isotoipc abundances from high-redshift to the local universe

    Hughes, Gemma LouiseUniversity of Central Lancashire2008

    … of carbon, sulphur, and titanium isotopes at redshifts z-.1 and in the Galactic stellar disc and halo have opened a new window into the study of isotopic abundance patterns and the origin of the chemical elements. Using our Galactic chemical evolution code CEtool, we have examined the …

    cent-lancashire Repository record

  12. Cosmology with clusters of galaxies : high-redshift clusters and the evolution of cluster substructure

    Jeltema, Tesla ErinMassachusetts Institute of Technology2004

    … observation of MS1054-0321. MS1054-0321 is the highest redshift cluster in the Einstein Medium Sensitivity Survey (EMSS), and it was one of the first high-redshift clusters observed with Chandra. I confirm that this cluster is hot and massive, although its temperature is slightly lower than …

    mit Repository record

  13. Spatially resolved spectroscopy of faint star-forming galaxies & their environments in the high redshift universe

    Hurley, MairéadDublin City University2011

    … for the detailed study of ordinary objects at high redshift. We present spectroscopic data for a strongly-lensed galaxy at z = 0:79 from which we measure the physical conditions in the interstellar medium and characterise the star formation history/ activity. Significant spatial variations in …

    dcu Repository record

  14. The Mass-Pitch Angle Relation for Three High Redshift Active Galaxies Selected from the GOODS Field

    Hughes, John Adam2017

    … heavens, we have come to realize the presence of highly energetic gravitational wells at the center of all galaxies. These supermassive black holes at a galaxies nucleus formed in the company of the other features making up the galaxy, particularly spiral arms. With nearby galaxies showing a …

    arkansas Repository record

  15. Bent tail radio sources as tracers of galaxy clusters at high redshift and SMBH mass estimates

    Mguda, Zolile MartinDepartment of Astronomy2021

    … in observations as tracers of galaxy clusters at redshifts of up to z _ 1. They have, however, been shown to be numerous in galaxy groups as well. The ability to find high redshift galaxy clusters is important in cosmology because they are important cosmological probes. According to the _ CDM …

    cape-town Repository record

  16. Studies on the gamma-ray burst phenomenon and on its use to probe the high redshift universe

    Vergani, Susanna D.Dublin City University2009

    … be used as a tool to retrieve information on the high redshift universe. In my thesis work, I explore some of the research areas that can be investigated using GRBs. Using the REM observations of GRB060418 and GRB060607, the initial Lorentz factor of the GRB explosion could be measured. The value …

    dcu Repository record

  17. Emission Line Galaxies from CADIS : High Redshift Lyman-Alpha Galaxies and Metal Poor Galaxies at Medium Redshift

    Maier, ChristianUniversität Heidelberg

    … at 0.4<z<0.7 have been selected by their high [OIII]5007 / [OII]3727 ratios. Their oxygen abundances, determined by follow-up spectroscopy, indicate that the metallicity-luminosity relation which applies to galaxies in the local universe also holds at z=0.6. Ly-alpha galaxy candidates from …

    heid-diss Repository record

  18. Investigating the properties of gamma ray bursts and gravitational wave standard sirens as high redshift distance indicators

    Speirits, Fiona ClaireUniversity of Glasgow2008

    … wave standard sirens as an alternative high-redshift distance indicator. We first illustrate their strong diagnostic potential through a Bayesian model comparison between the standard Unified Dark Matter model and a variant in which the dark component is redshift dependent. By drawing …

    glasgow Repository record

  19. Hunting Supermassive Black Holes in the Early Universe

    Tee, Wei LeongThe University of Arizona.2025

    … focuses on using state-of-the-art instrument to highlight novel approaches and anticipated findings in the quest to characterize the earliest and faintest AGNs. We developed quasar survey by joining the next generation Rubin Legacy Survey of Space and Time (LSST) and Roman High-Latitude Wide Area …

    arizona-thes Repository record

  20. The evolution of star-forming galaxies : analysis of infrared observations by AKARI

    Sedgwick, Christopher JohnThe Open University2016

    … by the AKARI Space Telescope. Spectroscopic redshifts have been measured for over 400 galaxies using the fibre spectrograph AAOmega in the AKARI Deep Field South, the first significant spectroscopic campaign in a relatively new, cirrus-free deep field. A local luminosity function of galaxies …

    the-open-u Repository record

Page 1 of 6