Doctor of Philosophy in Astronomy
Physics and Astronomy
Kentaro Nagamine, Committee Chair
First Committee Member
Second Committee Member
Graduate Faculty Representative
Number of Pages
We calculate the cross-correlation function (CCF) between damped Ly-alpha systems (DLAs) and Lyman break galaxies (LBGs) using cosmological hydrodynamic simulations at z = 3. We compute the CCF with two different methods. First, we assume that there is one DLA in each dark matter halo if its DLA cross section is non-zero. In our second approach we weight the pair-count by the DLA cross section of each halo, yielding a cross-section-weighted CCF. We also compute the angular CCF for direct comparison with observations. Finally, we calculate the auto-correlation functions of LBGs and DLAs, and their bias against the dark matter distribution. For these different approaches, we consistently find that there is good agreement between our simulations and observational measurements by Cooke et al. (2006a) and Adelberger et al. (2005). Our results thus confirm that the spatial distribution of LBGs and DLAs can be well described within the framework of the concordance Lambda-CDM model. We find that the correlation strengths of LBGs and DLAs are consistent with the actual observations, and in the case of LBGs it is higher than would be predicted by low-mass galaxy merger models.
We present theoretical computational results of magnitudes, luminosity functions, galaxy number counts, and redshift distribution in the 3.6, 4.5, 5.8, and 8.0 µms of IRAC and 24, 70, and 160 µms of MIPS bands using cosmological hydrodynamic simulations. We combine GADGET-3 with GRASIL spectrophotometic code to compute galaxy spectral energy distribution. We compare our luminosity function (IRAC: 8µm and MIPS: 24µm) results with observational and sampling data (Caputi et al., 2007; Rodighiero et al., 2009) from the Spitzer Space Telescope. We find that there is reliable agreement with their results.
Cross-correlation functions; Damped Ly-α systems (DLA); Low-mass galaxies; Lyman break galaxies (LBG); Simulations
Astrophysics and Astronomy | External Galaxies
Lee, Tae Song, "DLA-LBG cross-correlation and basic properties of infrared galaxies in cosmological simulations" (2010). UNLV Theses, Dissertations, Professional Papers, and Capstones. 13.