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 21 for “"starbursts"”.
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Starbursts in extragalactic giant H II regions
… massive stars and the interstellar matter. For starbursts in giant H II regions, a key issue is whether a tight cluster is formed and later becomes a globular cluster or distributed OB associations are formed and later disperse. In addition, the types of environments that can produce very …
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Starbursts in the UV bright interacting galaxies NGC 3395 and NGC 3396
We have obtained ultraviolet and visible wavelength images for the interacting galaxies, NGC 3395/6, using the Space Telescope Imaging Spectrograph (STIS) on Hubble Space Telescope (HST). The images show many isolated sources of ultraviolet emission which are young star forming regions with ages …
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Seyfert and starburst activity in galaxies: Modeling and analysis
… 16 Seyferts, and found no evidence for strong starbursts in the majority of them. A comparison to starbursts suggests that the [FeII]¹˙²⁶μm/Paβ¹˙²⁸μm versus H₂²˙¹²¹μm/Brγ²˙¹⁶μm diagram is the best available Seyfert-starburst separator. We created a unique infrared evolutionary population …
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Formation of young massive star clusters: a high-resolution multi-wavelength study of intensely star-formation galaxies
… and dense star clusters in a sample of 42 nearby starbursts and luminous infrared galaxies (LIRGs) ...
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The Evolution of and Starburst-AGN Connection in Luminous and Ultraluminous Infrared Galaxies and their Link to Globular Cluster Formation
<p>The evolutionary connection between nuclear starbursts and active galactic nuclei (AGN) in luminous infrared galaxies (LIRGs; 1011o<oLIRo< 1012 L) and ultraluminous infrared galaxies (ULIRGs; 1012 < LIR < 1013 L), which result from galaxy interactions and mergers and produce the bulk of their …
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Classification and Abundance of Extremely Red Galaxies with R-J=>5
… scenarios, both for elliptical galaxies, dusty starbursts and spiral galaxies. Only elliptical galaxies at redshift > 1.4 and which have undergone the last phase of star formation at redshift z=3, have red enough spectral energy distributions to be classified as an ERO. Using multi-colour …
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Investigating bursty star formation and interstellar medium conditions in low-mass galaxies
… can be naturally produced through central starbursts. Bursty star formation causes the matter in the central region to expand, resulting in flatter density profiles over multiple episodes of starbursts. Bursty star formation could also quantify the scatter in scaling relations, such as that …
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Supernovae as gamma ray emitters from the MeV to the TeV
… supernova cosmic-ray acceleration is similar in starbursts and in our Galaxy. We find that these starbursts are indeed nearly if not fully proton calorimeters. For NGC 4945 and NGC 1068, the models are consistent with calorimetry but are less well-constrained due to the lack of TeV data. However, …
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Lyα emission as a sensitive probe of galactic mergers and reionization
… We show that galaxy mergers trigger intense starbursts, significantly boosting Lyα luminosity. Additionally, resonant scattering produces extended red wings in the line profiles, which enhance transmission through the neutral intergalactic medium (IGM). Our simulations successfully reproduce …
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Cellular and Molecular Mechanisms of Retinal Neuron Spatial Patterning
… two populations of interneurons, the OFF and ON starbursts amacrine cells (SACs), which require the cell-surface receptor MEGF10 to establish their mosaics. We find that SACs in Megf10 mutants still make lateral movements in the plane of the retina, but fail to recognize their proximity to …
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Gas flows and feedback in star-forming galaxies
… Galaxies (LIRGs: LIR ≥1011L) from Supernovae and starbursts in the infrared, SUNBIRD survey imaged with the Southern African Large Telescope (SALT). This project can be seen in two major areas. The first is analyzing the emission and absorption spectra, in this case from the hot ionized gas and …
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Probing Galaxy Evolution with AKARI
… normal local spiral galaxies, rather than starbursts, consistent with them lying on the high-redshift `main sequence' unlike local ultraluminous infrared galaxies. The thesis concludes by measuring the percentage of the far-infrared Cosmic Infrared Background (CIB) resolved by AKARI …
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Search for post-starburst (E+A) galaxies in the cluster Abell 3266
… at significantly different epochs. If the starbursts are related to the recent merger history of Abell 3266, instead of being just isolated events, they would indicate that there may have been more than one merger in this cluster in the past 3 Gyr or so. This might explain the rather …
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The evolution of galaxies and AGN
… by obscured AGN rather than ultraluminous starbursts. Through statistical analyses of the ECDFS and WHDF, we show that N_H > 10^22 cm^−2 AGN are typically bright at 870um, with less absorbed AGN being much weaker sub-mm emitters. Overall, X-ray-detected AGN contribute 1.5+/-0.1 Jy deg^−2 to …
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Simulations of cosmic reionization
… top-heavy stellar initial mass function during starbursts in the Baugh et al. (2005) model, triggered by galaxy mergers, are the dominant source of ionizing photons. We show that the luminosity functions predicted by this model are in good agreement with the most recent Hubble Space Telescope …
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Galaxy evolution : near and far
… - extremely faint dwarfs, and extremely luminous starbursts - in an attempt to test the limits of galaxy evolution models. The thesis falls into two complimentary halves, addressing topics in the low redshift and high redshift Universe respectively. In the low redshift Universe, I discuss …
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Galaxy Formation in the Lambda-Cold Dark Matter Cosmology
… a top-heavy initial mass function (IMF) in starbursts and superwind feedback, and Bower et al (2006), which incorporates AGN feedback with a standard IMF. I compare the luminosity function, colours, sizes and morphology distributions of present-day galaxies in the models and with the SDSS. …
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Characterising star forming and luminous infrared galaxies with the Southern African Large Telescope (SALT)
… stellar population properties of a group of 52 starbursts and luminous infrared galaxies (LIRGs) in the local universe that forms part of the SUperNovae and starBurst in the InfraReD (SUNBIRD) survey. The galaxies in a distance range of 3.5 < Dl < 280 Mpc and infrared luminosity of 10.30 < LIR < …
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The Active Phases of a Galaxy in the JWST and Euclid Era: From Radio Jets and Multiphase Outflows to Mergers
… mergers, as these provide fresh gas, triggering starbursts and fueling black hole activity, sometimes leading to the formation of multiple AGNs within the same system. We first provide an overview of these phenomena, discussing AGN physics, feedback mechanisms, and the impact of galaxy mergers. …
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Star formation in unobscured quasars
It is now well established that a substantial fraction of all galaxy assembly occurs in intense bursts of star formation and black hole accretion, but the role of these two modes and how much they affect one another remains unclear. We thus investigate this in three complementary studies. In the …
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