Can Lensing Measure The Shape Of Dark Matter Halos PDF Download
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Author | : Uzair Hussain |
Publisher | : |
Total Pages | : 95 |
Release | : 2012 |
Genre | : |
ISBN | : |
Download Can Lensing Measure the Shape of Dark Matter Halos? Book in PDF, ePub and Kindle
The aim of this project was to explore the shapes of dark matter halos using high resolution N-body simulations. One of the main aspects explored was how well the shape can be measured through weak lensing. T.
Author | : Masato Shirasaki |
Publisher | : Springer |
Total Pages | : 144 |
Release | : 2015-11-18 |
Genre | : Science |
ISBN | : 9812877967 |
Download Probing Cosmic Dark Matter and Dark Energy with Weak Gravitational Lensing Statistics Book in PDF, ePub and Kindle
In this book the applicability and the utility of two statistical approaches for understanding dark energy and dark matter with gravitational lensing measurement are introduced. For cosmological constraints on the nature of dark energy, morphological statistics called Minkowski functionals (MFs) to extract the non-Gaussian information of gravitational lensing are studied. Measuring lensing MFs from the Canada–France–Hawaii Telescope Lensing survey (CFHTLenS), the author clearly shows that MFs can be powerful statistics beyond the conventional approach with the two-point correlation function. Combined with the two-point correlation function, MFs can constrain the equation of state of dark energy with a precision level of approximately 3–4 % in upcoming surveys with sky coverage of 20,000 square degrees. On the topic of dark matter, the author studied the cross-correlation of gravitational lensing and the extragalactic gamma-ray background (EGB). Dark matter annihilation is among the potential contributors to the EGB. The cross-correlation is a powerful probe of signatures of dark matter annihilation, because both cosmic shear and gamma-ray emission originate directly from the same dark matter distribution in the universe. The first measurement of the cross-correlation using a real data set obtained from CFHTLenS and the Fermi Large Area Telescope was performed. Comparing the result with theoretical predictions, an independent constraint was placed on dark matter annihilation. Future lensing surveys will be useful to constrain on the canonical value of annihilation cross section for a wide range of mass of dark matter annihilation. Future lensing surveys will be useful to constrain on the canonical value of annihilation cross section for a wide range of mass of dark matter.
Author | : Randall Wayth |
Publisher | : |
Total Pages | : |
Release | : 2003 |
Genre | : |
ISBN | : |
Download How Round is Your Halo? Book in PDF, ePub and Kindle
Author | : Priyamvada Natarajan |
Publisher | : World Scientific |
Total Pages | : 276 |
Release | : 2002-03-28 |
Genre | : Science |
ISBN | : 9814489395 |
Download Shapes Of Galaxies And Their Dark Halos, The - Proceedings Of The Yale Cosmology Workshop Book in PDF, ePub and Kindle
This book constitutes the proceedings of a very topical workshop aimed at understanding the shapes of the baryonic and dark matter components of galaxies. Several groups presented their recent results from observations and numerical N-body simulations.
Author | : Frederic Courbin |
Publisher | : Springer |
Total Pages | : 202 |
Release | : 2008-01-11 |
Genre | : Science |
ISBN | : 3540458573 |
Download Gravitational Lensing: An Astrophysical Tool Book in PDF, ePub and Kindle
Gravitational lensing is by now sufficiently well understood that it can be used as a tool of investigation in other astrophysical areas. Applications include the determination of the Hubble constant, probing the dark matter context of galaxies and the mapping of the universe to the identification of otherwise invisible large-scale structures. Each chapter of the book covers in a self-contained manner a subfield of gravitational lensing, with the double aim of describing in a simple way the basics of the theory and of reviewing the most recent developments as well as applications foreseen in the near future. The book will thus be particularly useful as a high-level textbook for nonspecialist researchers and advanced students wishing to become familiar with the field all the way up to the forefront of research.
Author | : Space Telescope Science Institute (U.S.). Symposium |
Publisher | : Cambridge University Press |
Total Pages | : 354 |
Release | : 1997-06-28 |
Genre | : Science |
ISBN | : 9780521591645 |
Download The Extragalactic Distance Scale Book in PDF, ePub and Kindle
One of the hottest debates in astronomy and cosmology today concerns the value of the Hubble constant. This constant is of paramount importance since it fixes the size and age of the Universe. At a symposium at the Space Telescope Science Institute, experts from around the world presented the latest results from a plethora of techniques for determining the Hubble constant. The value has always been controversial, but at this meeting experts' results agreed for the first time to within about 20%. Based on the meeting, this book presents twenty-three specially written review articles. They provide a comprehensive account of the Hubble-constant debate with the latest results from gravitational lensing, supernovae and novae, the Tully-Fisher relation, the Sunyaev-Zeldovich effect, globular clusters, planetary nebulae, light echoes, and the Hubble Space Telescope Key Project. This timely volume provides a standard reference for graduate students and researchers in astronomy and cosmology.
Author | : Scott Dodelson |
Publisher | : Academic Press |
Total Pages | : 462 |
Release | : 2003-03-13 |
Genre | : Science |
ISBN | : 0122191412 |
Download Modern Cosmology Book in PDF, ePub and Kindle
An advanced text for senior undergraduates, graduate students and physical scientists in fields outside cosmology. This is a self-contained book focusing on the linear theory of the evolution of density perturbations in the universe, and the anisotropiesin the cosmic microwave background.
Author | : Priyamvada Natarajan |
Publisher | : World Scientific |
Total Pages | : 286 |
Release | : 2002 |
Genre | : Science |
ISBN | : 9789810248482 |
Download The Shapes of Galaxies and Their Dark Halos Book in PDF, ePub and Kindle
This book constitutes the proceedings of a very topical workshop aimed at understanding the shapes of the baryonic and dark matter components of galaxies. Several groups presented their recent results from observations and numerical N-body simulations.
Author | : Peter Schneider |
Publisher | : Springer Science & Business Media |
Total Pages | : 565 |
Release | : 2006-12-30 |
Genre | : Science |
ISBN | : 3540303103 |
Download Gravitational Lensing: Strong, Weak and Micro Book in PDF, ePub and Kindle
The observation, in 1919 by A.S. Eddington and collaborators, of the gra- tational de?ection of light by the Sun proved one of the many predictions of Einstein’s Theory of General Relativity: The Sun was the ?rst example of a gravitational lens. In 1936, Albert Einstein published an article in which he suggested - ing stars as gravitational lenses. A year later, Fritz Zwicky pointed out that galaxies would act as lenses much more likely than stars, and also gave a list of possible applications, as a means to determine the dark matter content of galaxies and clusters of galaxies. It was only in 1979 that the ?rst example of an extragalactic gravitational lens was provided by the observation of the distant quasar QSO 0957+0561, by D. Walsh, R.F. Carswell, and R.J. Weymann. A few years later, the ?rst lens showing images in the form of arcs was detected. The theory, observations, and applications of gravitational lensing cons- tute one of the most rapidly growing branches of astrophysics. The gravi- tional de?ection of light generated by mass concentrations along a light path producesmagni?cation,multiplicity,anddistortionofimages,anddelaysp- ton propagation from one line of sight relative to another. The huge amount of scienti?c work produced over the last decade on gravitational lensing has clearly revealed its already substantial and wide impact, and its potential for future astrophysical applications.
Author | : Martina Kleinheinrich |
Publisher | : |
Total Pages | : 0 |
Release | : 2003 |
Genre | : |
ISBN | : |
Download Dark Matter Halos of Galaxies Studied with Weak Gravitational Lensing Book in PDF, ePub and Kindle