Computer Science
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phdt.......103a&link_type=abstract
ProQuest Dissertations And Theses; Thesis (Ph.D.)--The Ohio State University, 2010.; Publication Number: AAT 3430025; ISBN: 9781
Computer Science
Scientific paper
We present a study on the properties of galaxies and active galactic nuclei (AGNs), and of their evolution through cosmic time. We start by deriving an optimal basis of low resolution empirical spectral energy distribution (SED) templates for galaxies from 0.2 to 10 mum using observations of the NOAO Deep-Wide Field Survey (NDWFS) Bootes field. We use these templates to estimate photometric redshifts and K-corrections and to study the luminosity function of galaxies as a function of galaxy type and its evolution with redshift. We then extend the set of SED templates to also include AGNs. The wavelength range of these templates is expanded to 0.03--30 mum range by adding GALEX FUV and NUV, and MIPS 24mum observations of the NDWFS Bootes field. We use these templates to estimate photometric redshifts for AGNs and to study biases in mid-IR AGN color selection techniques. We also predict the color distribution of objects in the WISE mission and design an AGN color selection criterion for it. We also present a study of the J-band luminosity function of AGNs from redshift 0 to 6. Our sample is composed of a combination of mid-IR and X-ray selected objects, which avoids the typical biases of optically selected samples. We model the luminosity function by a double power-law and find that its evolution cannot be described by either pure luminosity or pure density evolution, but must be a combination of both. Finally, we present a study of possible biases in AGN black hole (BH) mass estimates based on the CIV, Halpha and Hbeta broad emission lines using a sample of high redshift lensed quasars from the CASTLES project with observed-frame ultraviolet and near-infrared spectra. We find that that the residuals between CIV and Balmer line mass estimates are strongly correlated with the ratio of the UV and optical continuum luminosities, and that removing this dependency reduces the scatter between the UV and optical based BH mass estimates by a factor of approximately 2.
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