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Mapping The Dark Matter With Weak Gravitational Lensing Microform
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Author :Gordon Keith Squires Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612119536 Total Pages :334 pages Book Rating :4.1/5 (195 download)
Book Synopsis Mapping the Dark Matter with Weak Gravitational Lensing [microform] by : Gordon Keith Squires
Download or read book Mapping the Dark Matter with Weak Gravitational Lensing [microform] written by Gordon Keith Squires and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1995 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Weak Gravitational Lensing by : Maunta Manandhar
Download or read book Weak Gravitational Lensing written by Maunta Manandhar and published by . This book was released on 2007 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Probing Cosmic Dark Matter and Dark Energy with Weak Gravitational Lensing Statistics by : Masato Shirasaki
Download or read book Probing Cosmic Dark Matter and Dark Energy with Weak Gravitational Lensing Statistics written by Masato Shirasaki and published by Springer. This book was released on 2015-11-18 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Mapping Dark Matter in Galaxy Clusters with Gravitational Lensing by : Sut-Ieng Tam
Download or read book Mapping Dark Matter in Galaxy Clusters with Gravitational Lensing written by Sut-Ieng Tam and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mapping All the Mass in the Universe (with Weak Gravitational Lensing) - Oral Presentation by :
Download or read book Mapping All the Mass in the Universe (with Weak Gravitational Lensing) - Oral Presentation written by and published by . This book was released on 2015 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent discoveries have shown that most of the universe is made of an exotic dark matter that behaves much differently than the normal matter that we experience in everyday life. As we cannot detect dark matter directly, we must infer its location in the universe by indirect effects, such as the distortion of light from distant galaxies as it travels through large clouds of dark matter. While the degree of distortion should be proportional to the amount of dark matter present, we don't know the original shape of the galaxy so the distortion is difficult to quantify. If we had a model of how dark matter is linked to galaxies, and thus be able predict the amount of distortion that should occur, we could apply the model to galaxy surveys to map out the dark matter in our universe. In this research, I attach a spherical 'halo' of dark matter to each galaxy in a simulated universe to approximate its known complex dark matter structure. I then predict how the halos distort the light from distant galaxies generated behind the halos. As the data is simulated, the true distortion of the light is known which is compared to the halo-predicted distortion. I find that, on average, the model under-predicts the degree of distortion on all scales and fails to capture distortions from large-scale dark matter structure. These issues are likely due to missing features in the model, as the halo model is a greatly simplified version of the actual distribution of dark matter. Potential improvements to the model for future work are discussed.
Book Synopsis An Investigation of Cosmological Dark Matter Using Weak Gravitational Lensing by : R. Michael Jarvis
Download or read book An Investigation of Cosmological Dark Matter Using Weak Gravitational Lensing written by R. Michael Jarvis and published by . This book was released on 2002 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dark Matter and Galaxies by : Lars Arnout Koens
Download or read book Dark Matter and Galaxies written by Lars Arnout Koens and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Using Weak Gravitational Lensing to Find Dark Matter Distributions by : Maria Cuellar
Download or read book Using Weak Gravitational Lensing to Find Dark Matter Distributions written by Maria Cuellar and published by . This book was released on 2009 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Applications of Weak Gravitational Lensing by : Candace Oaxaca Wright
Download or read book Applications of Weak Gravitational Lensing written by Candace Oaxaca Wright and published by . This book was released on 2002 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studying Dark Matter Using Weak Gravitational Lensing by :
Download or read book Studying Dark Matter Using Weak Gravitational Lensing written by and published by . This book was released on 2017 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reconstructing Dark Matter Distributions Using Weak Gravitational Lensing by : Bela Abolfathi
Download or read book Reconstructing Dark Matter Distributions Using Weak Gravitational Lensing written by Bela Abolfathi and published by . This book was released on 2011 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dark Matter Halos of Galaxies Studied with Weak Gravitational Lensing by : Martina Kleinheinrich
Download or read book Dark Matter Halos of Galaxies Studied with Weak Gravitational Lensing written by Martina Kleinheinrich and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dark Matter and Dark Energy by : Sabino Matarrese
Download or read book Dark Matter and Dark Energy written by Sabino Matarrese and published by Springer Science & Business Media. This book was released on 2011-02-10 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together reviews from leading international authorities on the developments in the study of dark matter and dark energy, as seen from both their cosmological and particle physics side. Studying the physical and astrophysical properties of the dark components of our Universe is a crucial step towards the ultimate goal of unveiling their nature. The work developed from a doctoral school sponsored by the Italian Society of General Relativity and Gravitation. The book starts with a concise introduction to the standard cosmological model, as well as with a presentation of the theory of linear perturbations around a homogeneous and isotropic background. It covers the particle physics and cosmological aspects of dark matter and (dynamical) dark energy, including a discussion of how modified theories of gravity could provide a possible candidate for dark energy. A detailed presentation is also given of the possible ways of testing the theory in terms of cosmic microwave background, galaxy redshift surveys and weak gravitational lensing observations. Included is a chapter reviewing extensively the direct and indirect methods of detection of the hypothetical dark matter particles. Also included is a self-contained introduction to the techniques and most important results of numerical (e.g. N-body) simulations in cosmology. " This volume will be useful to researchers, PhD and graduate students in Astrophysics, Cosmology Physics and Mathematics, who are interested in cosmology, dark matter and dark energy.
Book Synopsis Probing the Effects of a Mixed Dark Matter Scenario Using Weak Gravitational Lensing and Cosmic Microwave Background Observations by : Fabian Hervas Peters
Download or read book Probing the Effects of a Mixed Dark Matter Scenario Using Weak Gravitational Lensing and Cosmic Microwave Background Observations written by Fabian Hervas Peters and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Weak Gravitational Lensing Study of Dark Matter Distribution in The Abell 226/228 Supercluster Field Using The COMBO-17 Survey Data by : Zahra Sheikhbahaee
Download or read book Weak Gravitational Lensing Study of Dark Matter Distribution in The Abell 226/228 Supercluster Field Using The COMBO-17 Survey Data written by Zahra Sheikhbahaee and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Statistical Analysis of Galaxy Cluster Dark Matter Distribution with Weak Gravitational Lensing by : Angela Marie Berti
Download or read book Statistical Analysis of Galaxy Cluster Dark Matter Distribution with Weak Gravitational Lensing written by Angela Marie Berti and published by . This book was released on 2014 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Constraining Dark Matter Through the Study of Merging Galaxy Clusters by : William Anthony Dawson
Download or read book Constraining Dark Matter Through the Study of Merging Galaxy Clusters written by William Anthony Dawson and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The majority (~85%) of the matter in the universe is composed of dark matter, a mysterious particle that does not interact via the electromagnetic force yet does interact with all other matter via the gravitational force. Many direct detection experiments have been devoted to finding interactions of dark matter with baryonic matter via the weak force. To date only tentative and controversial evidence for such interactions has been found. While such direct detection experiments have ruled out the possibility that dark matter interacts with baryonic matter via a strong scale force, it is still possible that dark matter interacts with itself via a strong scale force and has a self-scattering cross-section of ~0.5 cm2g−1. In fact such a strong scale scattering force could resolve several outstanding astronomical mysteries: a discrepancy between the cuspy density profiles seen in [Lambda]CDM simulations and the cored density profiles observed in low surface brightness galaxies, dwarf spheroidal galaxies, and galaxy clusters, as well as the discrepancy between the significant number of massive Milky Way dwarf spheroidal halos predicted by [Lambda]CDM and the dearth of observed Milky Way dwarf spheroidal halos. Need: While such observations are in conflict with [Lambda]CDM and suggest that dark matter may self-scatter, each suffers from a baryonic degeneracy, where the observations might be explained by various baryonic processes (e.g., AGN or supernove feedback, stellar winds, etc.) rather than self-interacting dark matter (SIDM). In fact, the important scales of these observations often coincide with baryonic scales (e.g., the core size in clusters is few factors smaller than the radius of the brightest cluster galaxy). What is needed is a probe of SIDM where the expected effect cannot be replicated by the same processes responsible for the baryonic degeneracy in the aforementioned probes. Merging galaxy clusters are such a probe. During the merging process the effectively collisionless galaxies (~2% of the cluster mass) become dissociated from the collisional intracluster gas (~15% of the cluster mass). A significant fraction of the gas self-interacts during the merger and slows down at the point of collision. If dark matter lags behind the effectively collisionless galaxies then this is clear evidence that dark matter self-interacts. The expected galaxy-dark matter offset is typically >25 kpc (for cross-sections that would explain the other aforementioned issues with [Lambda]CDM), this is larger than the scales of that are plagued by the baryonic degeneracies. Task: To test whether dark matter self-interacts we have carried out a comprehensive survey of the dissociative merging galaxy cluster DLSCL J0916.2+2951 (also known as the Musket Ball Cluster). This survey includes photometric and spectroscopic observations to quantify the position and velocity of the cluster galaxies, weak gravitational lensing observations to map and weigh the mass (i.e., dark matter which comprises ~85% of the mass) of the cluster, Sunyaev-Zel'dovich effect and X-ray observations to map and quantify the intracluster gas, and finally radio observations to search for associated radio relics, which had they been observed would have helped constrain the properties of the merger. Using this information in conjunction with a Monte Carlo analysis model I quantify the dynamic properties of the merger, necessary to properly interpret constraints on the SIDM cross-section. I compare the locations of the galaxies, dark matter and gas to constrain the SIDM cross-section. This dissertation presents this work. Findings: We find that the Musket Ball is a merger with total mass of 4.8(+3.2)(-1.5) x 1014M(sun). However, the dynamic analysis shows that the Musket Ball is being observed 1.1(+1.3)(-0.4) Gyr after first pass through and is much further progressed in its merger process than previously identified dissociative mergers (for example it is 3.4(+3.8)(1.4) times further progressed that the Bullet Cluster). By observing that the dark matter is significantly offset from the gas we are able to place an upper limit on the dark matter cross-section of [sigma](SIDM)m−1(DM)