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Found 5 essays matching the above criteria.
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1. Starbursts at Cosmic Dawn : Formation of Globular Clusters, Ultra-Faint Dwarfs, and Population III star clusters at z > 6
University essay from Stockholms universitet/Institutionen för astronomiAbstract : In the standard model of cosmology (ΛCDM) the first stars, star clusters, and galaxies are expected to have formed in short bursts of star formation in low-mass dark matter halos at high redshifts (). Up to this point, attempts to predict the properties and abundances of these luminous objects have made use of numerically expensive cosmological simulations. READ MORE
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2. Lyman Continuum Radiation from Intermediate-Mass Black Holes : An Estimation of the Contribution of LyC Radiation from IMBHs in z~3 Galaxies
University essay from Uppsala universitet/Observationell astrofysikAbstract : This thesis concerns the cosmic reionization of the intergalactic medium in the high redshift universe and, in particular, is a first approach to examine what role intermediate mass black holes (IMBHs) play in this cosmic age. Unexpectedly high values of hydrogen ionizing radiation, compared to current models, have been reported from galaxies at redshift ~3 (used as stand-ins for galaxies at the age of reionization), and thus these models need revision, potentially by adding effects of IMBH content in the galaxies. READ MORE
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3. Cosmic Dawn in a Fuzzy Universe : Constraining the nature of Dark Matterwith 21 cm Cosmology
University essay from Stockholms universitet/Institutionen för astronomiAbstract : The cold dark matter (CDM) paradigm underlying the standard CDM model of cosmology is successful on large scales but faces potential problems on small scales partly related to a seeming overproduction of dwarf galaxies. This could be alleviated in exotic dark matter models that suppresses small-scale structure formation. READ MORE
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4. A classification approach to solving the cosmic reionization puzzle
University essay from Uppsala universitet/Institutionen för informationsteknologiAbstract : Cosmic reionization is a phase in the history of the universe that is still not understood completely. Among the different theories regarding what could have been the cause of this process, young star-forming galaxies stand out as the most likely candidate. READ MORE
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5. Simulating the spectra of galaxies in the reionization epoch : Constraining the escape fraction of ionizing photons
University essay from Uppsala universitet/Observationell astrofysikAbstract : The cosmic reionization represents a fundamental yet poorly understood phase transition in the evolution of our universe. The most promising theory is that the ionizing radiation from young hot stars in star-forming galaxies drove reionization, but much information about the number of galaxies and the escape fraction of ionizing radiation from galaxies is still missing. READ MORE
