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Relevant bibliographies by topics / Intergalactic medium; Cosmology / Dissertations / Theses

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Dissertations / Theses on the topic 'Intergalactic medium; Cosmology'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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Consult the top 17 dissertations / theses for your research on the topic 'Intergalactic medium; Cosmology.'

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1

OʹMeara, John M. "Cosmology from the high redshift intergalactic medium /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2004. http://wwwlib.umi.com/cr/ucsd/fullcit?p3129951.

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2

Peeples, Molly S. "From Galaxies to the Intergalactic Medium." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1280965443.

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3

Leonard, Anthony Patrick Burford. "Simulating the Lyman-#alpha# forest." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300815.

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4

Calverley, Alexander Peter. "Probing the Intergalactic Medium with high-redshift quasars." Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/241943.

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Clues about the timing of reionization and the nature of the ionizing sources responsible are imprinted in the ionization and 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 the intensity of the ultraviolet background(UVB), quantified by the hydrogen photoionization rate, Γ_bkg. At high redshifts this has been estimated by measuring the mean flux in

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5

Kollmeier, Juna Ariele. "The intergalactic medium absorption, emission, disruption /." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1153856075.

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6

Higgins, Jonathan. "Lyman-alpha scattering in the intergalactic medium during the epoch of reionisation." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/8805.

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We examine resonant scattering of Lyα (Lyman-alpha) photons in the neutral hydrogen Intergalactic Medium (IGM) at high redshift. Lyα scattering plays a key role in the 21cm emission/absorption against the Cosmic Microwave Background via the 'Wouthuysen-Field Effect' Knowledge of the strength of Lyα scattering induced by the first sources will constitute a significant step in predicting and understanding the eventual observations of the impact of these objects on the signal from the IGM during the Epoch of Reionisation (EoR), using planned facilities such as the Square Kilometre Array. A quanti

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7

Klar, Jochen. "A detailed view of filaments and sheets of the warm-hot intergalactic medium." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/5803/.

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In the context of cosmological structure formation sheets, filaments and eventually halos form due to gravitational instabilities. It is noteworthy, that at all times, the majority of the baryons in the universe does not reside in the dense halos but in the filaments and the sheets of the intergalactic medium. While at higher redshifts of z > 2, these baryons can be detected via the absorption of light (originating from more distant sources) by neutral hydrogen at temperatures of T ~ 10^4 K (the Lyman-alpha forest), at lower redshifts only about 20 % can be found in this state. The remain (abo

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8

Finley, Hayley. "Overdense regions in the intergalactic medium and the environments of high-redshift quasars." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066248/document.

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Des systèmes d'absorption Lorentziens, qui sondent les nuages de gaz HI de plus hautes densités de colonne, servent ici à sonder les environnements de galaxies hôtes de noyaux actifs à grand décalage spectral (z > 2). Ceci permet d'étudier l'effet des mécanismes de rétroaction des noyaux actifs sur les galaxies hôtes, tel que les vents à haute vitesse et l'ionisation intense. J'implémente deux techniques pour identifier les systèmes Lorentziens au décalage spectral du quasar dans les données du Sloan Digital Sky Survey III Baryon Oscillation Spectroscopic Survey.Un tel système Lorentzien fa

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9

Liske, Jochen Physics Faculty of Science UNSW. "Cosmology with the Lyman alpha forest." Awarded by:University of New South Wales. School of Physics, 2000. http://handle.unsw.edu.au/1959.4/17870.

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In this thesis we investigate the large-scale distribution of Ly alpha forest absorption, the effect of ionizing radiation from QSOs on their surrounding intergalactic medium and the primordial abundance of deuterium. We develop a new technique for detecting structure on Mpc scales in the Ly alpha forest. This technique does not rely on identifying individual absorption lines but is rather based on the statistics of the transmitted flux. We demonstrate that the new method is significantly more sensitive to the presence of large-scale structure in the Ly alpha forest than a two-point correlati

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10

Cai, Zheng. "Cosmic Structure Formation: From First Star to Large-scale Filamentary Structure." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/578387.

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Theory of cosmic structure formation outlines how stars, galaxies, clusters of galaxies, and large-scale structures formed out of primordial density fluctuations. It presents us a picture of cosmic mass assembly, and places strong constraints on cosmological model. Both observations and theories suggest that structures formation follows a "bottom up" process, in which small, low-mass component form first, and gradually develop into larger, more massive systems. This dissertation focuses on three crucial stages of cosmic structure formation: first generation stars, quasar host galaxies and the

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11

Ceccotti, Emilio. "Upper limits on the 21 cm power spectrum from the epoch of reionization." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20004/.

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In this Thesis work, we analyse 21cm line observations taken with the Precision Array to Probe the Epoch of Reionization (PAPER) in the 120-180MHz range (6<z<10). We focus on the power spectrum estimate of the Epoch of Reionization (EoR) signal at four different redshift intervals from 8 hours of data. The analysis of PAPER data is unconventional: the array is constituted by 128 dipoles arranged in a redundant configuration in order to maximize the power spectrum sensitivity on a limited number of k-modes. For this reason, PAPER observations are not ideal to image and model foreground emission

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12

Gnedin, Nickolay Y., George D. Becker, and Xiaohui Fan. "Cosmic Reionization on Computers: Properties of the Post-reionization IGM." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624497.

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We present a comparison between several observational tests of the post-reionization intergalactic medium and the numerical simulations of reionization completed under the Cosmic Reionization On Computers (CROC) project. The CROC simulations match the gap distribution reasonably well, and also provide a good match for the distribution of peak heights, but there is a notable lack of wide peaks in the simulated spectra and the flux-probability distribution functions are poorly matched in the narrow redshift interval 5.5 < z < 5.7, with the match at other redshifts being significantly better, alb

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13

Dall'Aglio, Aldo. "Constraining the UV background with the proximity effect." Phd thesis, Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2009/3871/.

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After the epoch of reionisation the intergalactic medium (IGM) is kept at a high photoionisation level by the cosmic UV background radiation field. Primarily composed of the integrated contribution of quasars and young star forming galaxies, its intensity is subject to spatial and temporal fluctuations. In particular in the vicinity of luminous quasars, the UV radiation intensity grows by several orders of magnitude. Due to an enhanced UV radiation up to a few Mpc from the quasar, the ionised hydrogen fraction significantly increases and becomes visible as a reduced level of absorption in the

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14

Ariño, i. Prats Andreu. "Physics of the Intergalactic Medium: a Study of the Power Spectrum ot the Lyman Alpha Forest and the Metal Content of Damped Lyman Alpha Systems." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/289625.

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El Medi Intergalàctic permet una caracterització de propietats bàsiques de l'univers tals com paràmetres fonamentals del model cosmològic, el creixement de pertorbacions primordials de densitat i formació de galàxies. Aquesta caracterització s'assoleix mitjançant l'absorció de la llum per part del Medi Intergalàctic a l'espectre d'espectres d'objectes llunyans i lluminosos. Tot això ens motiva considerar dos aspectes del Medi Intergalàctic: primerament utilitzarem simulacions numèriques i models teòric per comprendre les complexitats de la evolució no lineal del medi intergalàctic. D'altra

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15

Chippendale, Aaron Paul. "Detecting cosmological reionization on large scales through the 21 cm HI line." University of Sydney, 2009. http://hdl.handle.net/2123/6256.

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Doctor of Philosophy (PhD)<br>This thesis presents the development of new techniques for measuring the mean redshifted 21 cm line of neutral hydrogen during reionization. This is called the 21 cm cosmological reionization monopole. Successful observations could identify the nature of the first stars and test theories of galaxy and large-scale structure formation. The goal was to specify, construct and calibrate a portable radio telescope to measure the 21 cm monopole in the frequency range 114 MHz to 228 MHz, which corresponds to the redshift range 11.5 > z > 5.2. The chosen approach combined

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16

Anglés-Alcázar, Daniel, Romeel Davé, Claude-André Faucher-Giguère, Feryal Özel, and Philip F. Hopkins. "Gravitational torque-driven black hole growth and feedback in cosmological simulations." OXFORD UNIV PRESS, 2017. http://hdl.handle.net/10150/622943.

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We investigate black hole-host galaxy scaling relations in cosmological simulations with a self-consistent black hole growth and feedback model. Our sub-grid accretion model captures the key scalings governing angular momentum transport by gravitational torques from galactic scales down to parsec scales, while our kinetic feedback implementation enables the injection of outflows with properties chosen to match observed nuclear outflows (star formation-driven winds are not included to isolate the effects of black hole feedback). We show that 'quasar mode' feedback can have a large impact on the

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17

Williams, Rik Jackson. "The warm-hot environment of the Milky Way." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1154972702.

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