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.
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Showing 1 to 20 of 30 for “"Early-type galaxies"”.
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X-ray properties of early-type galaxies
It has been known for some time that many early–type galaxies possess halos of X–ray emitting gas. However, the properties of these halos and the processes by which they form are as yet not well understood. We have compiled the largest catalogue of X–ray luminosities to date, and use it to examine …
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Early Type Galaxies And Reliable Galaxy Cluster Selection
In an era of precision cosmology, clusters of galaxies are the natural consequences under the hierarchical scenario, within which clusters directly encapsulate the history of structure formation. Thus, determining the mass distribution of clusters as a function of redshift enables fundamental tests …
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Searching for Interacting Early Type Galaxies at Late Cosmic Times
… between two comparably massive spheroidal galaxies are post u-lated to be the central mechanism responsible for the assembly of the most massive (M[subscript star,tot] ≥ 10¹¹ M[subscript ☉]) elliptical galaxies. Numerical simulations predict that these mergers may occur at late cosmic times …
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Dust in Early-Type Galaxies using Herschel-ATLAS and GAMA data
This work investigates the properties of Early-Type Galaxies (ETGs; elliptical and lenticulars) containing thermal dust emission, with aims of linking the formation and evolution of these galaxies with their current dust properties. Three different proxies for morphology are considered for …
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The evolution of dark and luminous structure in massive early-type galaxies
… lensing and dynamical probes of the mass of early-type galaxies (ETGs) in order to improve our understanding of their dark and luminous mass structure and evolution. Firstly, I demonstrate that the dark matter halo of our nearest brightest cluster galaxy (BCG), M87, is centrally cored …
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Properties of the population of field galaxies at medium redshift
… Alto Deep Imaging Survey (CADIS), over 8000 galaxies were observed within an area of 435.2 arcmin*arcmin. On the basis of 17 observed filters they were classified according to redshift and spectral energy distribution. In this work we present analysis of the population of galaxies in the …
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Metallicities and stellar populations in spiral bulges
… compares Lick indices in bright elliptical galaxies with those in the bulges of spiral galaxies, in an effort to compare, contrast and constrain their star formation histories. Long-slit spectroscopic observations of line-strengths and kinematics were carried out along the minor axes of 32 …
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Development and Resultant Implementation of Custom Software for Analyses of Galactic Neighborhoods
The structure and organization of galaxies and their environments within the universe is a critical and fundamental question in the field of astrophysics. The amount of data available necessitates computer software to aid analyses. Previous research in the field utilized software built in FORTRAN …
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A deep near infrared survey along the Norma Wall
… addition, near-infrared surveys are sensitive to early-type galaxies which are better tracers of the mass in galaxies.
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Building galaxy models with self-consistent prescriptions for stellar and nebular emission
… dust. Translating between the observed flux from galaxies and meaningful astrophysical quantities relies on ``stellar population synthesis'' (SPS) models. These models include descriptions for the light produced by stars and dust in galaxies, but most neglect the nebular emission from ionized gas. …
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Lenticular galaxies - the one in the middle
The lenticular (S0) galaxies introduced by Hubble (1936) as a morphological transition class between elliptical and early-type spiral galaxies, which have the most massive bulges among disk galaxies, may have formed in several different ways as suggested by theoretical and numerical simulation …
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The evolution of the large scale structure of the universe since z=1
… The data used for this analysis were $sim4000$ galaxies in four fields of the Calar Alto Deep Imaging Survey (CADIS). The galaxies have luminosities brighter than $Ileq23^{mag}$, and redshifts with an error of $sigma_z=0.017$. The amplitude of the three-dimensional correlation function is …
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Growth of massive galaxies through cosmic time
The discovery that massive galaxies are on average more compact in the primitive Universe has shown the importance of the mechanisms which are growing galaxies in size with cosmic time. A better understanding of the characteristics of these compact objects will give us clues about the nature of the …
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The Relationship of Active Galactic Nuclei & Quasars With Their Local Galaxy Environment
… of AGNs, is fueled in major mergers of gas-rich galaxies. In such a picture, quasars, the highest luminosity AGNs, are expected to be located in regions with a higher density of galaxies on small scales where mergers are more likely to take place. However, in this picture, the activity observed …
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N(th)-Order Correlation Functions of Galaxies From the Sloan Digital Sky Survey
… and auto-correlation functions (o2 (theta)) of galaxies. The measured o N(theta) are used to calculate the projected, s N, and real space, SN, hierarchical amplitudes. I have used SDSS DR3 data to show that the measurements are robust against the systematic effects of reddening and seeing, and …
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Evolution of Galaxies - Star Formation Histories in Nearby Spheroids
… investigation into the formation of spheroidal type galaxies. The investigation began with modelling studies of early-type galaxies and spiral bulges (SBs). From galaxy formation modelling studies led by experiments with a sample galaxy, some results were obtained; nonsolar abundance ratios in …
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Population Synthesis Models for IMF studies
… ability to predict the observed values of Lick-type and IMF-sensitive indices in individual stars of the solar neighbourhood. The BT-Settl library was used to sample the cool main sequence stars and the Munari library for the rest of the evolutionary phases. The PSMs cover a range of …
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Galaxy Formation in the Lambda-Cold Dark Matter Cosmology
… and morphology distributions of present-day galaxies in the models and with the SDSS. The Bower et al model better reproduces the shape of the luminosity function, the morphology-luminosity relation and the colour bimodality observed in the SDSS data. The Baugh et al model is much more …
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