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 25 for “"galaxy properties"”.
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Environmental Impacts on Simulated Galaxy Properties
… of shapes, sizes, and colors. The range of properties is produced from a combination of physical processes. Galaxies live within various structures and therefore receive different influences from their environment that alter their evolutionary pathways. Thus, not only does each physical …
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The Impact of realistic galaxy orbits on jellyfish galaxy properties
Galaxy clusters, the most massive dark matter halos in the universe, decisively influence their environment and the evolution of galaxies within them. As galaxies move supersonically through the hot, magnetized intracluster medium (ICM) filling the space between galaxies in galaxy clusters, ram …
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Black hole masses and host galaxy properties in distant quasars from reverberation mapping surveys
… including black hole (BH) demographics, BH-host galaxy (co)-evolution, and AGN feedback mechanisms. Reverberation mapping (RM) is the primary technique to measure BH masses beyond the local Universe (z>0.3). RM measures the delay in variability signatures between the accretion disk and the …
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Illustris-TNG Simulated Central Black Mass(MBH) and Galaxy Properties Correlations with a Machine Learning Approach
… central black holes are tightly correlated with galaxy properties, most notably the bulge’s velocity dispersion. Cosmolog- ical hydrodynamical simulations can capture most of these correlations, but it is yet not understood why this occurs. To gain greater insight into central black hole growth …
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Using HI stacking to study galaxy properties in the nearby universe (Looking for needles in the HI-stack)
… forms and is therefore an important tracer of galaxy evolution. Due to the intrinsic faintness of the Hi emission line (observed at rest at 21 cm), galaxies beyond a few hundred megaparsecs are difficult to observe directly with current radio telescopes. However, in the next year, MeerKAT and …
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Introducing the Texas Euclid Survey for Lyman Alpha (TESLA) survey : initial study correlating galaxy properties to Lyman-alpha emission
… field. Using TESLA, we study how the physical properties of Lyman-α emitters (LAEs) correlate with Lyα emission to understand the escape of Lyα from galaxies at redshifts 2 – 3.5. We present an analysis of 43 LAEs performed in the NEP field using early data from the TESLA survey. We use Subaru …
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The HI super profiles of the THINGS galaxies
We use the HI velocity profiles of The HI Nearby Galaxy Survey (THINGS) galaxies to study the phase structure of the interstellar medium (ISM) and its relation to galaxy properties and morphology. To construct high signal-to-noise (S/N) profiles, we use a method analogous to the stacking method …
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Spectral Energy Distribution Modelling of X-ray Selected AGNs and Their Host Galaxies
… supermassive black hole (SMBH) masses, and host galaxy properties such as the velocity dispersion of stars, and bulge mass. However, the difference in scale between SMBH and their host galaxies has led to debate on how this relation might form, and develop over time. In order to aid in …
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Stochastinė galaktikų diskų evoliucija. 2-D modeliai /
Understanding of star formation processes in galaxy disks is one of the most important problems of the contemporary astrophysics. Despite fast-growing amounts of observational data, which allow studies of star formation in galaxy disks, there is a lack of fast and robust models for the analysis of …
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The effect of the cosmic web on galaxy evolution in RESOLVE-A
Galaxy environment plays a significant role in galaxy evolution. While most work has focused on the effect of cluster and group environment, large scale structures, such as filaments and voids, may provide additional contributions. Recently, various authors have found correlations between galaxy …
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Star formation and environment of galaxies
… gas is being converted into stars in a given galaxy. Star formation, a critical driver of galaxy evolution, responds both to external influences (local and global environment) and internal factors (e.g. dust).For several decades, the properties of star formation have been studied in galaxies …
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Star formation in the bars of nearby galaxies
… To understand the location of the bar and its properties, we used ellipse fitting to identify the bar properties, including the bar size and the bar strength. We also use the host stellar mass of each galaxy measured from the 3.6μm integrated magnitudes from S⁴G to investigate how the three …
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Modelling star formation and stellar feedback in numerical simulations of galaxy formation
… of the complex baryonic physics that regulate galaxy formation. Any theory of star formation in galaxies must encompass the radiative cooling of gas into dark matter haloes, the formation of a turbulent, multiphase interstellar medium (ISM), the efficiency with which molecular gas is able to …
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Investigating the Environmental Properties of Galaxies in the SDSS-MaNGA Survey
This thesis presents a study of galaxy evolution in the local universe. I study how environments shape the structures of galaxies, and how internal and external processes affect star formation. I perform four investigations of galaxy properties: a study of the relations between size, mass and …
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The Universal Rotation Curve of Disk Galaxies
… of dark matter halos plays an essential role in galaxy development. However, the response of the halo to internal baryonic processes is difficult to observe. We tackle this problem through an investigation of the Universal Rotation Curve (URC) hypothesis. A URC is an analytic function that can …
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A Westerbork blind HI imaging survey of the Perseus-Pisces filament in the Zone of Avoidance
… wavelengths (AB = 1.8 − 8.0), the details of its galaxy population and dynamics had not been investigated in detail before. Additionally, the diverse and dynamic cosmic environments of the PPS with the embedded galaxy cluster make this region an ideal laboratory to study the effects on these …
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Constraining the Quenching Mechanisms in Galaxies
… galactic outflows, and the heating of the galaxy halo and subsequent halting of gas accretion caused by virial shocks and preventative AGN feedback. Nonetheless, we still lack a clear understanding of which mechanism is the most important for quenching galaxies. The goal of this thesis is …
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New Insights on the Evolutionary Mechanisms of Local and Distant Galaxies
… stopping of star-formation is the process of galaxy quenching. Exploring this is the target of my thesis. In the first part of my thesis I use a methodology of partial correlation coefficients and random forest regression to disentangle multiple inter-correlated galaxy properties enabling me …
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The Host Galaxies of Luminous Reddened Quasars at z~2
… Here, we seek to characterise the star-forming properties of these obscured quasars to improve our understanding of galaxy-quasar coevolution. A key issue facing host galaxy studies among populations of the most luminous quasars is being able to disentangle the galaxy emission from that of the …
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Studying the environmental dependence of star formation properties of galaxies in the Abell 1437 galaxy cluster and its surrounding large scale structure
It has become clear that the local galaxy environment plays a crucial role in the evolution of galaxies. Recent studies show a strong bimodal distribution of galaxy properties, with red, passive galaxies dominating the bimodal distribution in dense environments, compared to blue, actively star …
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