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 40 for “"stellar population"”.
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XMM-Newton Survey of the Magellanic Bridge
We aim to characterise the X-ray binary population as a function of the local stellar population (in terms of age, metallicity, and stellar density) in the Magellanic Bridge, the interconnecting region between the Small and Large Magellanic Cloud. Gardiner and Noguchi (1996) suggest that closest …
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The Andromeda Optical and Infrared Disk Survey
… of galaxies inform us about a galaxy’s stellar populations and interstellar medium, revealing stories of galaxy formation and evolution. How we interpret this light depends in part on our proximity to the galaxy. For nearby galaxies, detailed star formation histories can be extracted …
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The Nature and Origin of Large Scale Diffuse X -Ray Emission in the Large Magellanic Cloud
… the physical structure of the multi-phase interstellar medium (ISM) of supergiant shells in the LMC using LMC2 as a detailed case study because it has the highest X-ray surface brightness of all supergiant shells in the LMC. Neither Halpha nor H I 21-cm line observations of LMC2 show an …
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Building galaxy models with self-consistent prescriptions for stellar and nebular emission
… 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. Accounting for nebular emission is important, as both line …
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Kinematics and Stellar Populations in Brightest Cluster Galaxies
… cluster galaxies (BCGs), their kinematic and stellar population properties and the relationships between these and the properties of the host clusters. Some of the questions addressed are: how the kinematic and stellar population properties differ from those of ordinary giant elliptical …
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Characterising star forming and luminous infrared galaxies with the Southern African Large Telescope (SALT)
Context: Stellar population modelling is a popular technique that has been extensively applied to main sequence galaxies. Yet starburst galaxies and Luminous InfraRed Galaxies (LIRGs) have, so far, not been studied as much using the method. LIRGs in the local universe are known to be highly …
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An X-ray census of the youngest galactic star clusters
Stellar clusters are vitally important laboratories for astrophysical research. These clusters, some of which have populations numbering in the hundreds of thousands, comprise a coeval stellar population of similar chemical composition at the same distance, the analysis of which can confront …
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Spectroscopic surface brightness fluctuations
… to study this evolution we can either study the stellar populations, tracing the star formation and chemical enrichment, or the dynamics, tracing interactions and mergers of galaxies as well as accretion. In the last decades this field has become one of the most active research areas in modern …
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The type IA supernova rate in intermediate redshift galaxy clusters
… of SNe Ia, act as tracers of the intra-cluster stellar population and can be used in measuring distances over extragalactic scales, which is relevant to supernova cosmology. However, the value of the cluster Type Ia supernova (SN Ia) rate at intermediate redshifts has not been well constrained …
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Luminous red galaxies in simulations
… in LRGs form at the same time, age-dating of two populations of LRGs at different redshifts can provide an estimate of the time difference associated with the corresponding redshift interval (dt/dz). This gives a direct estimate of the Hubble parameter at the average redshift of the two …
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The accuracy of integrated star clusters parameters. The effects of stochasticity /
… are traditionally derived using the Simple Stellar Population models (SSP). However, parameters are inaccurate because the models do not take the stochastic sampling of star mass in clusters into account. A method to derive the parameters of unresolved star clusters by taking the stochastic …
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Integralinių žvaigždžių spiečių parametrų tikslumas. Stochastiniai efektai /
… are traditionally derived using the Simple Stellar Population models (SSP). However, parameters are inaccurate because the models do not take the stochastic sampling of star mass in clusters into account. A method to derive the parameters of unresolved star clusters by taking the stochastic …
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Mass Functions and Mass Segregation in Young Starburst Clusters
… with the aim to gain deeper insight into the stellar mass distribution in starburst clusters. The dense stellar population in both clusters is resolved in unprecedented detail with high angular resolution, near-infrared instruments. In the case of the Arches cluster, diffraction-limited, …
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Modelling the star formation histories of nearby elliptical galaxies
… can lead to very large differences in population synthesis models attempting to recreate the observed values. As such, limited reliance should be placed on any results currently or historically in the literature purporting to give the star formation history of a galaxy, or group of …
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Activity and kinematics of low mass stars
… making up the kinematic distributions of the stellar population. We analyze each of the spatial velocities VR, Vz , and Ve defined in a Galactocentric cylindrical coordinate system. The kinematic analysis reproduced previous trends of increasing dispersion with increasing distance from the …
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Stellar Energy Feedback in Superbubbles
… X-ray emission from the superbubble in M17. The stellar population in M17 is young, only 1 million years old, suggesting no supernovae have occurred and providing a rare opportunity to test the predictions of wind-blown bubble models on superbubble scales without confusion from supernovae. The …
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Classification and Abundance of Extremely Red Galaxies with R-J=>5
… applied to select EROs. Hence, different galaxy populations are called extremely red''. In this thesis, galaxies with R-J=>5 are classified as extremely red. The available data set is based on optical (R-band) and near-infrared (J-band) observations. We have compiled a catalogue of 160 objects, …
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Seyfert and starburst activity in galaxies: Modeling and analysis
… local galaxy sample. We developed new tools for stellar population analysis in the infrared, using stellar absorption features. These tools are ideally suited for studies of dusty galaxies and obscured stars in the Milky Way. We used the CO band at 2.3μm to estimate the contribution from red …
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Kinematics and stellar populations of the galactic bulge.
… velocities and obtain metallicities for the stellar population of the Galactic bulge, several hundred spectra of giants have been obtained. These include three bulge fields at projected distances from the Galactic center of 1.5, 1.7 and 1.7 kpc, and 33 globular and open clusters. We measure …
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Initial Conditions and Collapse of Prestellar Cores
Prestellar Cores are created by the interaction of a turbulent velocity field and gravity. On large scales turbulence supports molecular clouds against gravity. But on small scales turbulence is able to create dense structures by locally converging flows. Eventually these structures may be captured …
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