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Author : Marie Korsaga
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (12 download)
Download or read book Distribution of Baryonic and Dark Matter in Spiral and Irregular Nearby Galaxies written by Marie Korsaga and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D. Lynden-Bell
Publisher : Springer Science & Business Media
ISBN 13 : 9400905653
Total Pages : 301 pages
Book Rating : 4.4/5 (9 download)
Download or read book Baryonic Dark Matter written by D. Lynden-Bell and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: The visible universe is a small perturbation on the material universe. Zwicky and Sinclair Smith in the 1930s gave evidence of invisible mass in the Coma and Virgo Clusters of Galaxies. Better optical data has only served to confound their critics and the X-ray data confirms that the gravitational potentials are many times larger than those predicted on the basis of the observed stars. Dynamical analyses of individual galaxies have found that significant extra mass is needed to explain their rotational velocities. On much larger scales, tens of megaparsecs, there is suggestive evidence that there is even more mass per unit luminosity. What is this non-luminous stuff of which the universe is made'? How much of it is there? Need there be only one kind of stuff? There are three basic possi bili ties:- all of it is ordinary (baryonic) matter, all of it is some other kind of (non-baryonic) matter, or some of it is baryonic and some is non-baryonic.
Author : Thomas Per Krister Martinsson
Publisher :
ISBN 13 : 9789461911117
Total Pages : 296 pages
Book Rating : 4.9/5 (111 download)
Download or read book The Distribution of Mass Within Spiral Galaxies written by Thomas Per Krister Martinsson and published by . This book was released on 2011 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lukas Grenacher
Publisher :
ISBN 13 :
Total Pages : 135 pages
Book Rating : 4.:/5 (638 download)
Download or read book Baryonic Dark Matter in Clusters and Spiral Galaxies written by Lukas Grenacher and published by . This book was released on 2001 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ken Freeman
Publisher : Springer Science & Business Media
ISBN 13 : 0387276181
Total Pages : 164 pages
Book Rating : 4.3/5 (872 download)
Download or read book In Search of Dark Matter written by Ken Freeman and published by Springer Science & Business Media. This book was released on 2006-08-25 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written for the educated non-scientist and scientist alike, it spans a variety of scientific disciplines, from observational astronomy to particle physics. Concepts that the reader will encounter along the way are at the cutting edge of scientific research. However the themes are explained in such a way that no prior understanding of science beyond a high school education is necessary.
Author : J. Val Blain
Publisher : Nova Publishers
ISBN 13 : 9781594542435
Total Pages : 272 pages
Book Rating : 4.5/5 (424 download)
Download or read book Progress in Dark Matter Research written by J. Val Blain and published by Nova Publishers. This book was released on 2005 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is generally believed that most of the matter in the universe is dark, i.e. cannot be detected from the light which it emits (or fails to emit). Its presence is inferred indirectly from the motions of astronomical objects, specifically stellar, galactic, and galaxy cluster/supercluster observations. It is also required in order to enable gravity to amplify the small fluctuations in the cosmic microwave background enough to form the large-scale structures that we see in the universe today. For each of the stellar, galactic, and galaxy cluster/supercluster observations the basic principle is that if we measure velocities in some region, then there has to be enough mass there for gravity to stop all the objects flying apart. Dark matter has important consequences for the evolution of the Universe and the structure within it. According to general relativity, the Universe must conform to one of three possible types: open, flat, or closed. The total amount of mass and energy in the universe determines which of the three possibilities applies to the Universe. In the case of an open Universe, the total mass and energy density (denoted by the Greek letter Omega) is less than unity. If the Universe is closed, Omega is greater than unity. For the case where Omega is exactly equal to one the Universe is "flat". This book details leading-edge research from around the globe.
Author : Priyamvada Natarajan
Publisher : World Scientific
ISBN 13 : 9814489395
Total Pages : 276 pages
Book Rating : 4.8/5 (144 download)
Download or read book Shapes Of Galaxies And Their Dark Halos, The - Proceedings Of The Yale Cosmology Workshop written by Priyamvada Natarajan and published by World Scientific. This book was released on 2002-03-28 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Jesús Falcón-Barroso
Publisher : Cambridge University Press
ISBN 13 : 1107035279
Total Pages : 657 pages
Book Rating : 4.1/5 (7 download)
Download or read book Secular Evolution of Galaxies written by Jesús Falcón-Barroso and published by Cambridge University Press. This book was released on 2012 with total page 657 pages. Available in PDF, EPUB and Kindle. Book excerpt: The formation and evolution of galaxies is one of the most important topics in modern astrophysics. Secular evolution refers to the relatively slow dynamical evolution due to internal processes induced by a galaxy's spiral arms, bars, galactic winds, black holes and dark matter haloes. It plays an important role in the evolution of spiral galaxies with major consequences for galactic bulges, the transfer of angular momentum, and the distribution of a galaxy's constituent stars, gas and dust. This internal evolution is in turn the key to understanding and testing cosmological models of galaxy formation and evolution. Based on the twenty-third Winter School of the Canary Islands Institute of Astrophysics, this volume presents reviews from nine world-renowned experts on the observational and theoretical research into secular processes, and what these processes can tell us about the structure and formation of galaxies. The volume provides a firm grounding for graduate students and early career researchers working on galactic dynamics and galaxy evolution.
Author : Luis Arturo Nunez de Villavicencio Castine
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (122 download)
Download or read book From Cosmological Simulations to Dark Matter Detection written by Luis Arturo Nunez de Villavicencio Castine and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This interdisciplinary thesis addresses spiral galaxy formation and dark matter phenomenology as well as its detection by the ANTARES neutrino telescope. A suite of high-resolution cosmological hydrodynamics simulations, with theadaptive mesh refinement code RAMSES, of the same galaxy, is performed using different modellings of stellar formation (Kennicut law (KS) versus gravo-turbulent criteria (multiFF)) and supernovae feed back (delayed cooling (DC) versus mechanical feedback (ME)). The results on the morphology and the properties of the galaxies are compared to observational constraints and high light the impact of baryonic physics on a spiral galaxy. The most elaborated scenarios (multi FF+DC or multi FF+ME) are clearly favoured and give rise to more realistic stellar mass and disc morphology.The resulting dark matter distributions in halos are also analyzed and compared showing some significant differences. The understanding of baryonic physics is crucial to understand the dark matter distribution. Namely, it is specifically modified and contracted by the baryonic potential of each simulation with a determining impact on direct and indirect dark matter detection. Moreover,we also use those informations about the dark matter to probe the Eddington inversion method aiming at predicting phase-space distribution from the gravitationnal potential. Those results are positive and very consistent and promisingin view of GAIA data analysis improvement and calibration. Further more, we also revisit the astrophysical uncertainties related to the dark matter velocity distribution relevant in the capture by the Sun and evaluate those effects to about 15-20% on the capture rate.
Author : Alain Mazure
Publisher : Springer Science & Business Media
ISBN 13 : 144198822X
Total Pages : 188 pages
Book Rating : 4.4/5 (419 download)
Download or read book Matter, Dark Matter, and Anti-Matter written by Alain Mazure and published by Springer Science & Business Media. This book was released on 2011-11-16 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: For over ten years, the dark side of the universe has been headline news. Detailed studies of the rotation of spiral galaxies, and 'mirages' created by clusters of galaxies bending the light from very remote objects, have convinced astronomers of the presence of large quantities of dark (unseen) matter in the cosmos. The most striking fact is that they seem to compromise about 95% of the matter/energy content of the universe. As for ordinary matter, although we are immersed in a sea of dark particles, including primordial neutrinos and photons from fossil cosmological radiation, both we and our environment are made of ordinary, 'baryonic' matter. Authors Mazure and Le Brun present the inventory of matter, baryonic and exotic, and investigating the nature and fate of matter's twin, anti-matter. They show how technological progress has been a result of basic research, in tandem with the evolution of new ideas, and how the combined effect of these advances might help lift the cosmic veil.
Author : Massimo Persic
Publisher :
ISBN 13 :
Total Pages : 632 pages
Book Rating : 4.3/5 (91 download)
Download or read book Dark and Visible Matter in Galaxies written by Massimo Persic and published by . This book was released on 1997 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hong-Xin Zhang
Publisher : Springer
ISBN 13 : 3662528673
Total Pages : 179 pages
Book Rating : 4.6/5 (625 download)
Download or read book Stellar Disk Evolution and Gaseous Disk Turbulence of Dwarf Irregular Galaxies written by Hong-Xin Zhang and published by Springer. This book was released on 2016-08-27 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the stellar disk evolution and gas disk turbulence of the most numerous galaxies in the local Universe – the dwarf galaxies. The “outside-in” disk shrinking mode was established for a relatively large sample of dwarf galaxies for the first time, and this is in contrast to the “inside-out” disk growth mode found for spiral galaxies. Double exponential brightness profiles also correspond to double exponential stellar mass profiles for dwarf galaxies, which is again different from most spiral galaxies. The cool gas distribution in dwarf galaxies was probed with the spatial power spectra of hydrogen iodide (HI) gas emission, and provided indirect evidence that inner disks of dwarf galaxies have proportionally more cool gas than outer disks. The finding that no correlation exists between gas power spectral indices and star formation gave important constraints on the relation between turbulence and star formation in dwarf galaxies.
Author : Arend H. Broeils
Publisher :
ISBN 13 :
Total Pages : 278 pages
Book Rating : 4.3/5 (91 download)
Download or read book Dark and Visible Matter in Spiral Galaxies written by Arend H. Broeils and published by . This book was released on 1992 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jaya Nagarajan-Swenson
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (135 download)
Download or read book Dark Matter in the Darkest Galaxies written by Jaya Nagarajan-Swenson and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dark matter in our universe is not evenly distributed: some galaxies are lacking it entirely, and some galaxies have it in abundance. While its existence is generally agreed on, its distribution within galaxies is hotly debated. Low Surface Brightness (LSB) spirals are a class of galaxy with peculiarly low star-formation rates, and one possible explanation for this points to an overabundance of dark matter relative to normal (baryonic) matter. LSB spirals tend to be dark matter-dominated at all radii, which makes them an ideal place to probe the structure of galactic dark matter haloes. In contrast, “normal” High Surface Brightness (HSB) spirals are baryon-dominated at the core, which obscures the central structure and muddles the apparent mass distribution of the galaxy. Currently, LSB spirals appear to be compatible with a “cored” halo, possibly due to early central star formation driving baryons out of the center, which dragged dark matter out along with it, thereby transforming a cuspy halo into a cored one. This thesis explores both the mystery of LSB spirals and the mystery of dark matter, pairing them together to shed light on the evolutionary difference between LSB and HSB spiral galaxies and begin examining cusp-core transformation. Optical emission line-derived velocity fields are used to determine the dynamical mass at different radii in a sample of eight LSB spirals, and archival Spitzer IRAC images allow the stellar mass at different radii in these galaxies to be determined. This results in a robust estimation of the structure of each galaxy's dark matter halo. We conclude that LSB spirals indeed tend to be dark matter-dominated at all radii, and highlight UGC 4179 as a likely case of solid-body rotation. Additionally, a peculiar trend in the [OII] to [OIII] ratio in these spectra is apparent, possibly supporting the truncated IMF hypothesis to explain LSB spirals.
Author : Bärbel Silvia Koribalski
Publisher : Springer Science & Business Media
ISBN 13 : 1402069332
Total Pages : 375 pages
Book Rating : 4.4/5 (2 download)
Download or read book Galaxies in the Local Volume written by Bärbel Silvia Koribalski and published by Springer Science & Business Media. This book was released on 2009-04-29 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely book presents an overview of the galaxies within the Local Volume, including the Local Group and our closest neighbours, the Andromeda Galaxy and the Magellanic Clouds. Presented here are the latest results from radio, infrared and optical surveys as well as detailed multi-wavelength studies of individual galaxies. The book aims to provide a vibrant forum for presentations and discussions across a broad range of astrophysical topics.
Author : Thomas Per Krister Martinsson
Publisher :
ISBN 13 : 9789461911155
Total Pages : pages
Book Rating : 4.9/5 (111 download)
Download or read book The Distribution of Mass Within Spiral Galaxies written by Thomas Per Krister Martinsson and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Polychronis Papaderos
Publisher : Springer Science & Business Media
ISBN 13 : 3642220185
Total Pages : 347 pages
Book Rating : 4.6/5 (422 download)
Download or read book Dwarf Galaxies: Keys to Galaxy Formation and Evolution written by Polychronis Papaderos and published by Springer Science & Business Media. This book was released on 2012-04-23 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dwarf galaxy research constitutes an extremely vibrant field of astrophysical research, with many long-standing questions still unsettled and new ones constantly arising. The intriguing diversity of the dwarf galaxy population, observed with advanced ground-based and space-borne observatories over a wide spectral window providing an unprecedented level of detail, poses new challenges for both observers and theoreticians. The aim of this symposium was to bring together these two groups to exchange ideas and new results on the many evolutionary aspects of and open issues concerning dwarf galaxies. The main topics addressed include: the birth of dwarf galaxies: theoretical concepts and observable relics across wavelengths and time, the morphological, structural and chemical evolution of dwarf galaxies, possible evolutionary connections between early-type and late-type dwarfs, the star formation history of dwarf galaxies and its dependence on intrinsic and environmental properties, the origin and implications of starburst activity in dwarf galaxies, the fate of dwarfish systems born out of tidally ejected matter in galaxy collisions.
