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Evolution Des Proprietes Globales Des Galaxies Dans Le Canada France Hawaii Telescope Legacy Survey
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Book Synopsis Evolution des propriétés globales des galaxies dans le Canada-France-Hawaii telescope legacy survey by : Florence Ienna
Download or read book Evolution des propriétés globales des galaxies dans le Canada-France-Hawaii telescope legacy survey written by Florence Ienna and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evolution of the Galaxy Distribution in Large Cosmological Surveys by : Melody Wolk
Download or read book Evolution of the Galaxy Distribution in Large Cosmological Surveys written by Melody Wolk and published by . This book was released on 2013 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this thesis is to investigate the relationship between the dark and the luminous part of the Universe. Within the standard cosmological model framework, we will use galaxies as our probes to study the matter distribution in the Universe and its evolution. In order to achieve this goal, we use statistical tools to characterize the way objects are distributed in the sky. We model our measurements using a phenomenological description: the ``halo model''. However, to make robust estimations, we need to have access to a large amount of data which is made possible by the use of photometric redshift surveys. First, we look at the redshift dependence of the hierarchical amplitudes of the galaxy distribution up to order 5 using a wide photometric survey, the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS), from present day up to intermediate redshifts. We interpret these measurements in the perturbation theory framework. We found that in the weakly non-linear regime, our measurements are marginally consistent with the predictions. However, these latter slightly over-predict our measurements, which suggests the existence of higher-order bias terms. Using the halo model, we also showed that the position of the transition between the non-linear and the weakly non-linear regime is fully compatible with theoretical expectations. Then, using two-point statistics on data from the UltraVISTA-COSMOS survey, we investigate the way galaxy clustering depends on the stellar mass and the redshift beyond a redshift of one. We found that, on average, samples with higher stellar mass thresholds have higher mean clustering amplitude meaning that rarer populations are more strongly clustered. We also interpreted these measurements in the context of the halo model. Furthermore, we consider the stellar mass to halo mass ratio and follow the evolution of the peak in this quantity up to redshift z \sim ~2 trying to interpret it in terms of galaxy formation. We showed that, for the full sample, M_{h}^{peak} shifts progressively to higher halo masses at higher redshifts, an effect known as ``anti-hierarchical''. Finally, we summarize our main results and present some of our future projects.
Book Synopsis Inferring the Photometric and Size Evolution of Galaxies from Image Simulations by : Sébastien Carassou
Download or read book Inferring the Photometric and Size Evolution of Galaxies from Image Simulations written by Sébastien Carassou and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current constraints on the luminosity and size evolution of galaxies rely on catalogs extracted from multi-band surveys. However resulting catalogs are altered by selection effects difficult to model and that can lead to conflicting predictions if not taken into account properly. In this thesis we have developed a new approach to infer robust constraints on model parameters. We use an empirical model to generate a set of mock galaxies from physical parameters. These galaxies are passed through an image simulator emulating the instrumental characteristics of any survey and extracted in the same way as from observed data for direct comparison. The difference between mock and observed data is minimized via a sampling process based on adaptive Monte Carlo Markov Chain methods. Using mock data matching most of the properties of a Canada-France-Hawaii Telescope Legacy Survey Deep (CFHTLS Deep) field, we demonstrate the robustness and internal consistency of our approach by inferring the size and luminosity functions and their evolution parameters for realistic populations of galaxies. We compare our results with those obtained from the classical spectral energy distribution (SED) fitting method, and find that our pipeline infers the model parameters using only 3 filters and more accurately than SED fitting based on the same observables. We then apply our pipeline to a fraction of a real CFHTLS Deep field to constrain the same set of parameters in a way that is free from systematic biases. Finally, we highlight the potential of this technique in the context of future surveys and discuss its drawbacks.
Book Synopsis Galaxy-galaxy Lensing in the COSMOS [Cosmological Evolution Survey] Survey by : Alexie Leauthaud
Download or read book Galaxy-galaxy Lensing in the COSMOS [Cosmological Evolution Survey] Survey written by Alexie Leauthaud and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Le but de cette thèse est d'étudier les halos de matière noire qui entourent les galaxies elliptiques et d'en déduire leur répartition de masse afin de comprendre comment ces galaxies se sont formées. Afin de réaliser cette étude, nous utilisons l'effet de cisaillement gravitationnel faible dans le champ COSMOS. Les halos de matière noire sont suffisamment massifs pour agir en tant que lentille gravitationnelle et dévier les rayons lumineux envoyés par les galaxies lointaines d'arrière plan. Etant donné que la distorsion d'une galaxie lentille sur une galaxie distante est très petite devant la largeur de la distribution en ellipticité des galaxies, la seule façon de mesurer cet effet est de considérer le problème statistiquement. Un avantage de cette approche statistique est qu'elle permet de sonder le potentiel gravitationnel des halos de galaxies jusqu'à un rayon très grand ou les méthodes plus traditionnelles ne sont pas applicables.
Book Synopsis Heritage Sites of Astronomy and Archaeoastronomy in the Context of the UNESCO World Heritage Convention by : Clive L. N. Ruggles
Download or read book Heritage Sites of Astronomy and Archaeoastronomy in the Context of the UNESCO World Heritage Convention written by Clive L. N. Ruggles and published by Ocarina Books. This book was released on 2012 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Thematic Study is a joint venture between ICOMOS, the advisory body to UNESCO on cultural sites, and the International Astronomical Union. It presents an overall vision on astronomical heritage, attempts to identify what constitutes "outstanding universal significance to humankind" in relation to astronomy, and identifies broad issues that could arise in the assessment of cultural properties relating to astronomy. This is the first Thematic Study in any field of science heritage. It is elaborated using examples of properties from around the world, including some already on the World Heritage List or national Tentative Lists. The subject matter ranges from early prehistory to modern astrophysics and space heritage, and also prominently includes dark sky issues and modern observatory sites. An e-version of the Thematic Study was published in June 2010 in time to be presented to the 2010 meeting of UNESCO's World Heritage Committee, where it was duly approved. It has been circulated officially by the WHC to all of UNESCO's National Commissions. This full-colour paperback edition with some updates, and reformatted to new ICOMOS standards, was published in 2011 and is now offered for public sale.
Book Synopsis Cosmic Evolution by : Eric J. Chaisson
Download or read book Cosmic Evolution written by Eric J. Chaisson and published by Harvard University Press. This book was released on 2001-02-16 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chaisson addresses some of the most basic issues we can contemplate: the origin of matter and the origin of life, and the ways matter, life, and radiation interact and change with time. He designs for us an expansive yet intricate model depicting the origin and evolution of all material structures.
Book Synopsis Advancing astrophysics with the square kilometre array : [proceedings from a meeting held in Giardini Naxos, Sicily, Italy, 9-13 June 2014] by :
Download or read book Advancing astrophysics with the square kilometre array : [proceedings from a meeting held in Giardini Naxos, Sicily, Italy, 9-13 June 2014] written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unveiling Galaxies by : Jean-René Roy
Download or read book Unveiling Galaxies written by Jean-René Roy and published by Cambridge University Press. This book was released on 2018 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: A thought provoking study of the powerful impact of images in guiding astronomers' understanding of galaxies through time.
Book Synopsis The Evolution of The Milky Way by : F. Matteucci
Download or read book The Evolution of The Milky Way written by F. Matteucci and published by Springer Science & Business Media. This book was released on 2000 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: This review of the most up-to-date observational and theoretical information concerning the chemical evolution of the Milky Way compares the abundances derived from field stars and clusters, giving information on the abundances and dynamics of gas.
Download or read book Lunar Sourcebook written by Grant Heiken and published by CUP Archive. This book was released on 1991-04-26 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only work to date to collect data gathered during the American and Soviet missions in an accessible and complete reference of current scientific and technical information about the Moon.
Download or read book Star Formation in Galaxies written by and published by . This book was released on 1987 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Universe of Galaxies by : Paul W. Hodge
Download or read book The Universe of Galaxies written by Paul W. Hodge and published by . This book was released on 1984 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Milky Way Galaxy, Andromeda Galaxy, Dark Mater in spiral Galazies, Cosmic Jets.
Book Synopsis Taming Liquid Hydrogen by : Virginia Parker Dawson
Download or read book Taming Liquid Hydrogen written by Virginia Parker Dawson and published by . This book was released on 2004 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Learning to Think Spatially by : National Research Council
Download or read book Learning to Think Spatially written by National Research Council and published by National Academies Press. This book was released on 2005-02-03 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learning to Think Spatially examines how spatial thinking might be incorporated into existing standards-based instruction across the school curriculum. Spatial thinking must be recognized as a fundamental part of Kâ€"12 education and as an integrator and a facilitator for problem solving across the curriculum. With advances in computing technologies and the increasing availability of geospatial data, spatial thinking will play a significant role in the information-based economy of the twenty-first century. Using appropriately designed support systems tailored to the Kâ€"12 context, spatial thinking can be taught formally to all students. A geographic information system (GIS) offers one example of a high-technology support system that can enable students and teachers to practice and apply spatial thinking in many areas of the curriculum.
Book Synopsis Open Skies by : Kenneth I. Kellermann
Download or read book Open Skies written by Kenneth I. Kellermann and published by Springer Nature. This book was released on 2020-01-01 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book on the history of the National Radio Astronomy Observatory covers the scientific discoveries and technical innovations of late 20th century radio astronomy with particular attention to the people and institutions involved. The authors have made extensive use of the NRAO Archives, which contain an unparalleled collection of documents pertaining to the history of radio astronomy, including the institutional records of NRAO as well as the personal papers of many of the pioneers of U.S. radio astronomy. Technical details and extensive citations to original sources are given in notes for the more technical readers, but are not required for an understanding of the body of the book. This book is intended for an audience ranging from interested lay readers to professional researchers studying the scientific, technical, political, and cultural development of a new science, and how it changed the course of 20th century astronomy.
Book Synopsis Archaeology, Anthropology, and Interstellar Communication by : National Aeronautics Administration
Download or read book Archaeology, Anthropology, and Interstellar Communication written by National Aeronautics Administration and published by CreateSpace. This book was released on 2014-09-06 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Addressing a field that has been dominated by astronomers, physicists, engineers, and computer scientists, the contributors to this collection raise questions that may have been overlooked by physical scientists about the ease of establishing meaningful communication with an extraterrestrial intelligence. These scholars are grappling with some of the enormous challenges that will face humanity if an information-rich signal emanating from another world is detected. By drawing on issues at the core of contemporary archaeology and anthropology, we can be much better prepared for contact with an extraterrestrial civilization, should that day ever come.
Book Synopsis The Complete Idiot's Guide to the Sun by : Jay M. Pasachoff
Download or read book The Complete Idiot's Guide to the Sun written by Jay M. Pasachoff and published by Penguin. This book was released on 2003 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: No Marketing Blurb
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