Testing Galaxy Formation And The Nature Of Dark Matter With Satellite Galaxies PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Testing Galaxy Formation And The Nature Of Dark Matter With Satellite Galaxies PDF full book. Access full book title Testing Galaxy Formation And The Nature Of Dark Matter With Satellite Galaxies.
| Author | : Anna Mercedes Nierenberg |
| Publisher | : |
| Total Pages | : 218 |
| Release | : 2014 |
| Genre | : |
| ISBN | : 9781321349894 |
Download Testing Galaxy Formation and the Nature of Dark Matter with Satellite Galaxies Book in PDF, ePub and Kindle
The abundance of low mass halos is one of the key predictions of LCDM, which remains at apparent odds with observations of luminous structure. We present new measurements of the spatial distribution and the cumulative luminosity function of satellite galaxies up to a thousand times fainter than their hosts, as a function of host stellar mass and morphology between redshifts 0.1 and 0.8, using imaging from the GOODS and COSMOS fields in conjunction with a rigorous statistical analysis. We demonstrate how these measurements provide powerful new constraints for abundance matching and cosmological simulations in the context of both warm and cold dark matter, and how future measurements of faint satellite colors using CANDELS, will provide important distinguishing power between warm and cold dark matter models. In addition, we present results from a complementary gravitational lens modeling project in which we use strongly lensed AGN narrow-line emission in order to detect dark matter subhalos, demonstrating a promising new method for measuring the subhalo mass function in thousands of lensed systems which will be discovered in ongoing and future optical surveys.
| Author | : Jun-Hwan Choi |
| Publisher | : ProQuest |
| Total Pages | : 226 |
| Release | : 2007 |
| Genre | : Dark matter (Astronomy) |
| ISBN | : 9780549330585 |
Download The Dynamics of Satellite and Dark Matter Halo Interactions on Galaxy Formation and Evolution Book in PDF, ePub and Kindle
| Author | : Jerome Drexler |
| Publisher | : Universal-Publishers |
| Total Pages | : 164 |
| Release | : 2004 |
| Genre | : Science |
| ISBN | : 9781581125511 |
Download How Dark Matter Created Dark Energy and the Sun Book in PDF, ePub and Kindle
Through use of a lecture-slide format, this book presents an astrophysics detective story that chronicles Jerome Drexler's literature search for astronomical clues and evidence to unveil the nature of dark matter. There are a number of mysteries in astrophysics and cosmology that have remained unsolved for decades. What is dark matter? How exactly are stars created? In 1998, it was determined from supernova studies that the expansion of the Universe was accelerating, thereby creating the mystery of dark energy. Astrophysicists have developed mutually exclusive, single-phenomenon theories for each of these three phenomena, but not a unified theory for all three of them. The author's original goal was to identify dark matter, a decades-old mystery. In the process, he developed a new theory for dark matter and illuminated the nature of dark energy and the process of Sun formation. Since dark matter may have been instrumental in the creation of galaxies and stars, the author decided to test his new dark matter theory on the formation of the Sun. The results were very encouraging. He next sought a possible link between dark matter and the accelerating expansion of the Universe, which is attributed to the mysterious dark energy. Using his dark matter theory and the laws of physics, the author explained the accelerating expansion of the Universe in a plausible manner. This book chronicles the author's search for a unified astrophysical theory and how it finally evolved.
| Author | : Houjun Mo |
| Publisher | : Cambridge University Press |
| Total Pages | : 841 |
| Release | : 2010-05-20 |
| Genre | : Science |
| ISBN | : 0521857937 |
Download Galaxy Formation and Evolution Book in PDF, ePub and Kindle
A coherent introduction for researchers in astronomy, particle physics, and cosmology on the formation and evolution of galaxies.
| Author | : David Merritt |
| Publisher | : Cambridge University Press |
| Total Pages | : 285 |
| Release | : 2020-04-30 |
| Genre | : Science |
| ISBN | : 1108665683 |
Download A Philosophical Approach to MOND Book in PDF, ePub and Kindle
Dark matter is a fundamental component of the standard cosmological model, but in spite of four decades of increasingly sensitive searches, no-one has yet detected a single dark-matter particle in the laboratory. An alternative cosmological paradigm exists: MOND (Modified Newtonian Dynamics). Observations explained in the standard model by postulating dark matter are described in MOND by proposing a modification of Newton's laws of motion. Both MOND and the standard model have had successes and failures – but only MOND has repeatedly predicted observational facts in advance of their discovery. In this volume, David Merritt outlines why such predictions are considered by many philosophers of science to be the 'gold standard' when it comes to judging a theory's validity. In a world where the standard model receives most attention, the author applies criteria from the philosophy of science to assess, in a systematic way, the viability of this alternative cosmological paradigm.
| Author | : John N. Bahcall |
| Publisher | : World Scientific |
| Total Pages | : 246 |
| Release | : 2004 |
| Genre | : Science |
| ISBN | : 9812567186 |
Download Dark Matter in the Universe Book in PDF, ePub and Kindle
If standard gravitational theory is correct, then most of the matterin the universe is in an unidentified form which does not emit enoughlight to have been detected by current instrumentation. This book isthe second editon of the lectures given at the 4th Jerusalem WinterSchool for Theoretical Physics, with new material added. The lecturesare devoted to the missing matter problem in the universe, thesearch to understand dark matter. The goal of this volume is to makecurrent research work on unseen matter accessible to students withoutprior experience in this area and to provide insights for experts inrelated research fields. Due to the pedagogical nature of the originallectures and the intense discussions between the lecturers and thestudents, the written lectures included in this volume often containtechniques and explanations not found in more formal journalpublications.
| Author | : Sownak Bose |
| Publisher | : Springer |
| Total Pages | : 207 |
| Release | : 2018-08-02 |
| Genre | : Science |
| ISBN | : 3319967614 |
Download Beyond ΛCDM Book in PDF, ePub and Kindle
This book employs computer simulations of ‘artificial’ Universes to investigate the properties of two popular alternatives to the standard candidates for dark matter (DM) and dark energy (DE). It confronts the predictions of theoretical models with observations using a sophisticated semi-analytic model of galaxy formation. Understanding the nature of dark matter (DM) and dark energy (DE) are two of the most central problems in modern cosmology. While their important role in the evolution of the Universe has been well established—namely, that DM serves as the building blocks of galaxies, and that DE accelerates the expansion of the Universe—their true nature remains elusive. In the first half, the authors consider ‘sterile neutrino’ DM, motivated by recent claims that these particles may have finally been detected. Using sophisticated models of galaxy formation, the authors find that future observations of the high redshift Universe and faint dwarf galaxies in the Local Group can place strong constraints on the sterile neutrino scenario. In the second half, the authors propose and test novel numerical algorithms for simulating Universes with a ‘modified’ theory of gravity, as an alternative explanation to accelerated expansion. The authors’ techniques improve the efficiency of these simulations by more than a factor of 20 compared to previous methods, inviting the readers into a new era for precision cosmological tests of gravity.
| Author | : Ingolfur Agustsson |
| Publisher | : |
| Total Pages | : 578 |
| Release | : 2012 |
| Genre | : |
| ISBN | : |
Download Satellite Galaxies as Probes of Dark Matter Halos Book in PDF, ePub and Kindle
Abstract: Dark matter cannot be observed directly at any wavelength of light, but it can be detected through its gravitational effects on luminous material. At present, all large galaxies are thought to be surrounded by "halos" of dark matter; however, the physical parameters of these halos are not well-constrained by observations. The favored theory of galaxy formation, Cold Dark Matter (CDM), ties together many diverse observations into a self-consistent picture of structure formation in the Universe. CDM has been very successful on large length scales (>1 Mpc), but its viability remains in doubt on smaller scales. My dissertation focuses on comparisons of CDM theory to observations of the Universe on these small scales. Here I use satellite galaxies to study the dark matter halos that surround large "host" galaxies. The hosts are the brightest galaxies in their regions of space and are relatively isolated compared to typical galaxies. A single observed host has too few satellites to provide strong constraints on the halo that surrounds it. However, large numbers of host galaxies and their satellites can be collected from modern redshift surveys. This makes it possible to study the hosts' halos using ensemble averages over many host-satellite systems. Using these ensemble averages, I determine the ways in which the locations and motions of the satellites are connected to properties of their hosts (e.g., morphology, color, stellar mass, star formation rate). In order to mimic the way in which the Universe is actually observed, I create an artificial imaging and redshift survey from a CDM computer simulation. This makes it possible to compare results obtained from observed host-satellite systems with host-satellite systems in CDM simulations. The main results of my dissertation are: 1) the locations of satellite galaxies reflect the shapes of the dark matter halos surrounding their hosts, 2) elliptical and spiral host galaxies are embedded within their halos in fundamentally different ways, and 3) the use of the motions of satellite galaxies to constrain the gravitational potentials of their hosts' halos is much less straightforward than has been assumed in previous work.
| Author | : National Research Council |
| Publisher | : National Academies Press |
| Total Pages | : 222 |
| Release | : 2003-03-12 |
| Genre | : Science |
| ISBN | : 030917113X |
Download Connecting Quarks with the Cosmos Book in PDF, ePub and Kindle
Advances made by physicists in understanding matter, space, and time and by astronomers in understanding the universe as a whole have closely intertwined the question being asked about the universe at its two extremesâ€"the very large and the very small. This report identifies 11 key questions that have a good chance to be answered in the next decade. It urges that a new research strategy be created that brings to bear the techniques of both astronomy and sub-atomic physics in a cross-disciplinary way to address these questions. The report presents seven recommendations to facilitate the necessary research and development coordination. These recommendations identify key priorities for future scientific projects critical for realizing these scientific opportunities.
| Author | : Miguel A. Sánchez-Conde |
| Publisher | : MDPI |
| Total Pages | : 220 |
| Release | : 2020-05-28 |
| Genre | : Mathematics |
| ISBN | : 3039360442 |
Download The Role of Halo Substructure in Gamma-Ray Dark Matter Searches Book in PDF, ePub and Kindle
An important, open research topic today is to understand the relevance that dark matter halo substructure may have for dark matter searches. In the standard cosmological model, halo substructure or subhalos are predicted to be largely abundant inside larger halos, for example, galaxies such as ours, and are thought to form first and later merge to form larger structures. Dwarf satellite galaxies—the most massive exponents of halo substructure in our own galaxy—are already known to be excellent targets for dark matter searches, and indeed, they are constantly scrutinized by current gamma-ray experiments in the search for dark matter signals. Lighter subhalos not massive enough to have a visible counterpart of stars and gas may be good targets as well, given their typical abundances and distances. In addition, the clumpy distribution of subhalos residing in larger halos may boost the dark matter signals considerably. In an era in which gamma-ray experiments possess, for the first time, the exciting potential to put to test the preferred dark matter particle theories, a profound knowledge of dark matter astrophysical targets and scenarios is mandatory should we aim for accurate predictions of dark matter-induced fluxes for investing significant telescope observing time on selected targets and for deriving robust conclusions from our dark matter search efforts. In this regard, a precise characterization of the statistical and structural properties of subhalos becomes critical. In this Special Issue, we aim to summarize where we stand today on our knowledge of the different aspects of the dark matter halo substructure; to identify what are the remaining big questions, and how we could address these; and, by doing so, to find new avenues for research.
