Mathematics – Logic
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phdt........23d&link_type=abstract
Ph.D dissertation, 2005. Section 0054, Part 0606 208 pages; United States -- New York: Columbia University; 2005. Publication N
Mathematics
Logic
Redshift, Galaxy Formation, Intergalactic
Scientific paper
The formation and evolution of galaxies and the thermodynamic state of the inter-galactic medium (IGM) are fundamentally intertwined. The formation of stars is associated with various mechanisms that can drastically perturb the IGM. Since the IGM contains the gas reservoir for the subsequent generation of galaxies, its distribution and thermodynamic state has direct consequence for the galaxies that have yet to form. Observational constraints on the evolution of the galaxy population translate directly to constraints on the evolution of the IGM and vice versa. In this thesis we focus on exploring techniques to phenomenologically constrain galaxy formation at high redshift and its impact on the IGM. We discuss a new way to determine the relation between temperature and density in the IGM, by analyzing the Lyb forest in the spectra of distant quasars. We address how neutral hydrogen gas may be detected in absorption in the X-Ray band and in emission in the Lya line during the first stages of galaxy formation. We investigate how the cooling and collapse of this gas is affected by the presence of a photoionizing background, that was generated by a population of sources that formed at an earlier epoch. The nature of these first sources is poorly known. The most popular candidates are stars and miniquasars. In this thesis we constrain the abundance of these miniquasars
at high redshift.
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