Download or read book Observational Constraints on the Assembly of Galaxies and Galaxy Clusters written by Julia Marie Comerford and published by . This book was released on 2009 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Constraints on Models of Gas in Clusters of Galaxies written by Mark J. Henriksen and published by . This book was released on 1985 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observational Constraints on the Statistical Properties of Clusters of Galaxies and the Halo Occupation Distribution written by Mehri Torki and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Merging Processes in Galaxy Clusters written by L. Feretti and published by Springer Science & Business Media. This book was released on 2006-04-18 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mergers are the mechanisms by which galaxy clusters are assembled through the hierarchical growth of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Many of the observed properties of clusters depend on the physics of the merging process. These include substructure, shock, intra cluster plasma temperature and entropy structure, mixing of heavy elements within the intra cluster medium, acceleration of high-energy particles, formation of radio halos and the effects on the galaxy radio emission. This book reviews our current understanding of cluster merging from an observational and theoretical perspective, and is appropriate for both graduate students and researchers in the field.
Download or read book Outskirts of Galaxy Clusters IAU C195 written by International Astronomical Union. Colloquium and published by Cambridge University Press. This book was released on 2004-12-16 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the International Astronomical Union Colloquium no. 195, held in Torino, Italy in 2004. The meeting investigated the formation of galaxies within a full cosmological context, focusing on the outer regions of galaxy clusters. The observed correlation of optical and radio properties of galaxies with their environment indicates that the formation and evolution of galaxies is intimately linked to the formation of large scale structure. With chapters written by leading authorities in the field, this timely volume investigates the role of the environment in determining the properties of galaxies. It describes the distribution of matter and galaxies on the largest scales in the Universe, the processes of cluster and galaxy formation, their role and interplay. This is a valuable collection of review articles for professional astronomers.
Download or read book Planets Stars and Stellar Systems written by Gerard Gilmore and published by Springer. This book was released on 2013-02-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is volume 5 of Planets, Stars and Stellar Systems, a six-volume compendium of modern astronomical research, covering subjects of key interest to the main fields of contemporary astronomy. This volume on “Galactic Structure and Stellar Populations”, edited by Gerard F. Gilmore, presents accessible review chapters on Stellar Populations, Chemical Abundances as Population Tracers, Metal-Poor Stars and the Chemical Enrichment of the Universe, The Stellar and Sub-Stellar Initial Mass Function of Simple and Composite Populations, The Galactic Nucleus, The Galactic Bulge, Open Clusters and Their Role in the Galaxy, Star Counts and the Nature of Galactic Thick Disk, The Infrared Galaxy, Interstellar PAHs and Dust, Galactic Neutral Hydrogen, High-Velocity Clouds, Magnetic Fields in Galaxies, Astrophysics of Galactic Charged Cosmic Rays, Gamma-Ray Emission of Supernova Remnants and the Origin of Galactic Cosmic Rays, Galactic Distance Scales, Globular Cluster Dynamical Evolution, Dynamics of Disks and Warps, Mass Distribution and Rotation Curve in the Galaxy, Dark Matter in the Galactic Dwarf Spheroidal Satellites, and History of Dark Matter in Galaxies. All chapters of the handbook were written by practicing professionals. They include sufficient background material and references to the current literature to allow readers to learn enough about a specialty within astronomy, astrophysics and cosmology to get started on their own practical research projects. In the spirit of the series Stars and Stellar Systems published by Chicago University Press in the 1960s and 1970s, each chapter of Planets, Stars and Stellar Systems can stand on its own as a fundamental review of its respective sub-discipline, and each volume can be used as a textbook or recommended reference work for advanced undergraduate or postgraduate courses. Advanced students and professional astronomers in their roles as both lecturers and researchers will welcome Planets, Stars and Stellar Systems as a comprehensive and pedagogical reference work on astronomy, astrophysics and cosmology.
Download or read book Using Galaxy Clusters as Cosmic Telescopes to Probe the Epoch of Reionization written by Austin Thomas Hoag and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Epoch of Reionization (hereafter "cosmic reionization" or simply "reionization") is one of the most significant remaining puzzles in cosmic history. Occurring less than one billion years after the Big Bang, reionization likely took place shortly after the formation of the first baryonic structures such as stars, galaxies and active galactic nuclei (AGN). Reionization is therefore intimately linked to several core astronomical fields such as: stellar formation and evolution, galaxy formation and evolution, large scale structure, and the cosmic microwave background, to name a few. In the last decade, significant investments have been made to observe galaxies during reionization, for example in the optical and near infrared with the Hubble Ultra-Deep Field, the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey, and the Hubble Frontier Fields. Experiments at radio frequencies have recently been undertaken to detect the global 21 cm signal expected from reionization, for example the Experiment to Detect the Global Epoch of reionization Signature, as well as to measure the power spectrum of the 21 cm radiation, such as the Murchison Wide Field Array and the Low-Frequency Array. While reionization has been a major focus in astronomy for over a decade, many key properties of the process are still uncertain. The main difficulty in constraining reionization is the faintness of the sources likely driving it, i.e. the first galaxies and AGN. Even with the most powerful current telescopes such as Keck and the Hubble Space Telescope (HST), observing all but the brightest of these sources is too expensive. Using a galaxy cluster as a gravitational lens, this observational challenge can be somewhat eased. In order to take advantage of cluster lensing to study faint galaxies, a gravitational lens model is required. In this dissertation, I present gravitational lens models I developed for 11 galaxy clusters in three large cluster surveys undertaken with the Hubble Space Telescope and the Spitzer Space Telescope. I selected redshift (z) 7 to 8 galaxies behind all of these clusters and followed them up with the Multi-Object Spectrometer For InfraRed Exploration (MOSFIRE) on the Keck I telescope. During this spectroscopic campaign I discovered a Lyman-alpha emitting galaxy at z=7.64 magnified by a factor of approximately 10. Its intrinsic luminosity is an order of magnitude fainter than the handful of other known Lyman-alpha emitters (LAEs) at z>7.5, all of which are bright, rare sources. While exhibiting weaker Lyman-alpha than the UV-brighter LAEs at z>7.5, the underlying mechanism which allows Lyman-alpha to escape all of these galaxies may be the same. I also obtained the tightest spectroscopic constraints on the redshift of one of the highest redshift gravitationally lensed galaxies (z~9) using ultra-deep grism spectroscopy from the Hubble Space Telescope. Using a sub-sample consisting of 8 out of 11 of these clusters for which the photometric analysis is complete, I constrained the fraction of Lyman-break galaxies showing Lyman-alpha, often just called the "Lyman-alpha fraction test," at z=8, making the first definitive measurement of a declining Lyman-alpha fraction (and hence increasing neutral hydrogen fraction) over the interval z=7-8 for UV-fainter galaxies. This is the first hint that faint galaxies suffer a similarly large decline in Lyman-alpha fraction as bright galaxies over this interval, suggesting that the overlap phase of reionization may still be underway at z=8.
Download or read book Lemaitre model with galaxies clustering in the quasistatic period written by Norzakiah Saparmin and published by . This book was released on 1995 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cosmological Constraints written by Mathilde Jauzac and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal thematic of my thesis work is the evolution and the formation of structures as a function of the redshift.My thesis analysis can be separated un two distinct parts, which can finally be merged in a third part with my last works.Firstly, I studied the evolution of the Cosmic Infrared Background (CIB) as a function of redshift at 70 and 160 μm using data from the Spitzer Space Telescope. This analysis was performed in the GOODS & COSMOS fields by applying a stacking method.Secondly, I studied the mass distribtuion in massive galaxy clusters at high redshifts by using the gravitational lensign effect.I used optical data coming from the Hubble Space Telescope. The sample of galaxy clusters I used comes from a subsample of the MAssive Cluster Survey (MACS, PI:E. Ebeling) named the "high-z" sample, and which comprises 12 clusters.Understanding the state of evolution of galaxy clusters at high redshift wil allow us to put constraints on formation and evolution models of structures. The understanding of the evolution cycle of galaxy clusters is mandatory in terms of Observational Cosmology.
Download or read book Galaxy Formation and Evolution written by Houjun Mo and published by Cambridge University Press. This book was released on 2010-05-20 with total page 841 pages. Available in PDF, EPUB and Kindle. Book excerpt: A coherent introduction for researchers in astronomy, particle physics, and cosmology on the formation and evolution of galaxies.
Download or read book Fundamentals of Galaxy Dynamics Formation and Evolution written by Ignacio Ferreras and published by UCL Press. This book was released on 2019-04-02 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxies, along with their underlying dark matter halos, constitute the building blocks of structure in the Universe. Of all fundamental forces, gravity is the dominant one that drives the evolution of structures from small density seeds at early times to the galaxies we see today. The interactions among myriads of stars, or dark matter particles, in a gravitating structure produce a system with fascinating connotations to thermodynamics, with some analogies and some fundamental differences. Ignacio Ferreras presents a concise introduction to extragalactic astrophysics, with emphasis on stellar dynamics, and the growth of density fluctuations in an expanding Universe. Additional chapters are devoted to smaller systems (stellar clusters) and larger ones (galaxy clusters). Fundamentals of Galaxy Dynamics, Formation and Evolution is written for advanced undergraduates and beginning postgraduate students, providing a useful tool to get up to speed in a starting research career. Some of the derivations for the most important results are presented in detail to enable students appreciate the beauty of maths as a tool to understand the workings of galaxies. Each chapter includes a set of problems to help the student advance with the material.
Download or read book Observational Constraints on the Influence of Active Galactic Nuclei on the Evolution of Galaxies written by Christopher Mark Harrison and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observational Surveys of Galaxy Clusters Compared with the Millennium Simulation written by Rhys Rhodes and published by . This book was released on 2014 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Minnesota Lectures on Clusters of Galaxies and Large scale Structure written by John M. Dickey and published by . This book was released on 1988 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Formation and Evolution of Star Clusters written by Kenneth Janes and published by . This book was released on 1991 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clustering in the Universe written by S. Maurogordato and published by Atlantica Séguier Frontières. This book was released on 1995 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Globular Star Clusters of the Andromeda Galaxy written by Charli M Sakari and published by Morgan & Claypool Publishers. This book was released on 2019-12-30 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a brief compilation of results from nearly a century of research on the globular star clusters in the Andromeda Galaxy (M31). It explores the techniques and limitations of the observations, the successes and challenges of the models, and the paradigm for the formation of M31 that has gradually emerged. These results will eventually be superseded by new data, better analysis techniques, and more complex models. However, the emphasis of this book is on the techniques, thought processes, and connections with other studies.
