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.
Results
Showing 1 to 9 of 9 for “"photometric surveys"”.
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Modeling large scale structure from photometric surveys
… on larger scales. We analyze the clustering of photometrically selected galaxy pairs by using the HOD model. Our results are successfully fit by these HOD models, and we see the separation of “1-halo” and “2-halo” clustering terms for both single galaxies and galaxy pairs. We find that the …
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Novel methods of supernova classification and type probability estimation
Future photometric surveys will provide vastly more supernovae than have presently been observed, the majority of which will not be spectroscopically typed. Key to extracting information from these future datasets will be the efficient use of light-curves. In the first part of this thesis we …
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Probabilistic photometric redshifts in the era of petascale astronomy
With the growth of large photometric surveys, accurately estimating photometric redshifts, preferably as a probability density function (PDF), and fully understanding the implicit systematic uncertainties in this process has become increasingly important. These surveys are expected to obtain images …
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Machine learning approaches to star-galaxy classification
… in the current and next-generation ground-based surveys may be challenged by poor star-galaxy classification. Thus, we explore a variety of machine learning approaches to improve star-galaxy classification in ground-based photometric surveys. In Chapter 2, we present a meta-classification …
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Rare Stellar Populations in the Magellanic Clouds: Identification of Super-Asymptotic Giant Branch Star and Yellow Supergiant Binary Candidates
… demonstrating the power of large surveys and systematic observation campaigns to constrain models of massive star evolution. First, I investigate the true nature of the peculiar star HV2112. Previous studies have identified HV2112 as the first Thorne-Zytkow object (TZO) candidate …
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Constraining dark energy using real and mock galaxy surveys
… of large-scale clustering in future galaxy surveys, and through the imprint of a time-varying large-scale potential on the CMB (the integrated Sachs-Wolfe effect). We use semi-analytical galaxy formation models implemented in N-body simulations to build mock galaxy catalogues which are well …
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Constraining Stellar Evolution in Young Open Clusters with NGTS
… is a multi-telescope, ground-based, wide-field photometric survey which is well-suited to studying these environments, and its observations are at the heart of this thesis, which presents my research in the field of early-stage stellar evolution as conducted during my PhD. As a member of the …
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A near-infrared view of luminous quasars: black hole masses, outflows and hot dust
… Using data from a number of recent wide-field photometric surveys, we have built a parametric SED model that is able to reproduce the median optical to infrared colours of tens of thousands of AGN at redshifts $1 < z < 3$. In individual objects, we find significant variation in the …
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Cosmology Using Photometric Samples of Type Ia Supernovae: The First Joint Photometric Light Curve Analysis
… do not know the typing of the supernova. These `photometric samples' are a significant switch from spectroscopic samples, in which every SNIa used in the analysis is spectroscopically identified. The motivation for this switch is the opportunity to have $\sim 10$ times larger samples than what …