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High Resolution Optical Velocity Fields Of Low Surface Brightness Galaxies And The Density Profiles Of Dark Matter Halos
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Book Synopsis High Resolution Optical Velocity Fields of Low Surface Brightness Galaxies and the Density Profiles of Dark Matter Halos by : Rachel Kuzio De Naray
Download or read book High Resolution Optical Velocity Fields of Low Surface Brightness Galaxies and the Density Profiles of Dark Matter Halos written by Rachel Kuzio De Naray and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Shapes of Galaxies and Their Dark Halos by : Priyamvada Natarajan
Download or read book The Shapes of Galaxies and Their Dark Halos written by Priyamvada Natarajan and published by World Scientific. This book was released on 2002 with total page 286 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.
Book Synopsis Dark Matter Halo Properties of Nearby, Late-type Galaxies by : Maritza Tavarez-Brown
Download or read book Dark Matter Halo Properties of Nearby, Late-type Galaxies written by Maritza Tavarez-Brown and published by . This book was released on 2005 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Understanding Dark Matter Halos with Tidal Caustics by : Robyn Ellyn Sanderson
Download or read book Understanding Dark Matter Halos with Tidal Caustics written by Robyn Ellyn Sanderson and published by . This book was released on 2011 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The products of interactions between galaxies with a high mass ratio and low orbital angular momentum are studied. The interactions scatter the material from the smaller galaxy into structures with distinctive dynamics and morphology, including high local densities and a simple density profile related to properties of the participating galaxies. The role of the larger galaxy's tides in creating these structures and their relation to a well-studied class of mathematical objects motivates us to name them "tidal caustics". We study the densities achievable in tidal caustics for a typical merger of this type using an example from the Andromeda galaxy to determine whether they are sufficient to produce a detectable gamma-ray signal from self-interactions in the dark matter component, for likely particle models of dark matter. We find that the expected signal is an order of magnitude too low to be detected with current instruments. We also study the constraints that can be placed on the properties of the participating galaxies by observing the surface brightness profiles of the tidal caustics. We find that the local gravity and gravity gradient of the larger galaxy, and the energy spread and initial phase space density of the smaller galaxy, can be jointly constrained by fitting this profile. The constraints are degenerate but model-independent. We find that measurements of multiple caustics and the velocity of the material in each caustic along the line of sight give information about the orbital angular momentum and the deviations from spherical symmetry in the larger galaxy, though this information is somewhat model-dependent. We discuss the main technical difficulty in fitting the surface brightness profile: determining the inclination angle of the caustic. We demonstrate that a simple model can successfully recover the necessary parameters for some cases, and that a simple modification to this model will improve its success rate.
Book Synopsis A Panchromatic View of Galaxies by : Alessandro Boselli
Download or read book A Panchromatic View of Galaxies written by Alessandro Boselli and published by John Wiley & Sons. This book was released on 2012-01-13 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describing how to investigate all kinds of galaxies through a multifrequency analysis, this text is divided into three different sections. The first describes the data currently available at different frequencies, from X-rays to UV, optical, infrared and radio millimetric and centimetric, while explaining their physical meaning. In the second section, the author explains how these data can be used to determine physical parameters and quantities, such as mass and temperature. The final section is devoted to describing how the derived quantities can be used in a multifrequency analysis to study such physical processes as the star formation cycle and constrain models of galaxy evolution. As a result, observers will be able to interpret galaxies and their structure.
Book Synopsis Dark and Visible Matter in Galaxies by : Massimo Persic
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:
Book Synopsis Extragalactic Astronomy and Cosmology by : Peter Schneider
Download or read book Extragalactic Astronomy and Cosmology written by Peter Schneider and published by Springer. This book was released on 2014-10-08 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition has been updated and substantially expanded. Starting with the description of our home galaxy, the Milky Way, this cogently written textbook introduces the reader to the astronomy of galaxies, their structure, active galactic nuclei, evolution and large scale distribution in the Universe. After an extensive and thorough introduction to modern observational and theoretical cosmology, the focus turns to the formation of structures and astronomical objects in the early Universe. The basics of classical astronomy and stellar astrophysics needed for extragalactic astronomy are provided in the appendix. While this book has grown out of introductory university courses on astronomy and astrophysics and includes a set of problems and solutions, it will not only benefit undergraduate students and lecturers; thanks to the comprehensive coverage of the field, even graduate students and researchers specializing in related fields will appreciate it as a valuable reference work.
Book Synopsis The Physical Properties of Low Surface Brightness Galaxies by : Stacy Sutton McGaugh
Download or read book The Physical Properties of Low Surface Brightness Galaxies written by Stacy Sutton McGaugh and published by . This book was released on 1992 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Astronomical Journal written by and published by . This book was released on 2008 with total page 1254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dark Matter in the Darkest Galaxies by : Jaya Nagarajan-Swenson
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.
Book Synopsis The Properties and Evolution of Low Surface Brightness Galaxies by : Willem Jan Geert de Blok
Download or read book The Properties and Evolution of Low Surface Brightness Galaxies written by Willem Jan Geert de Blok and published by . This book was released on 1997 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Philosophical Approach to MOND by : David Merritt
Download or read book A Philosophical Approach to MOND written by David Merritt and published by Cambridge University Press. This book was released on 2020-04-30 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Dark Matter in Dwarf Galaxies by : Joshua David Simon
Download or read book Dark Matter in Dwarf Galaxies written by Joshua David Simon and published by . This book was released on 2005 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physics of Nearby Galaxies by : Xuan Thuan Trinh
Download or read book Physics of Nearby Galaxies written by Xuan Thuan Trinh and published by Atlantica Séguier Frontières. This book was released on 1992 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis At the Heart of Darkness by : Matthew William Craig
Download or read book At the Heart of Darkness written by Matthew William Craig and published by . This book was released on 1997 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Literature 1988, Part 1 by : U. Esser
Download or read book Literature 1988, Part 1 written by U. Esser and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1266 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the reviews: "Astronomy and Astrophysics Abstracts has appeared in semi-annual volumes since 1969 and it has already become one of the fundamental publications in the fields of astronomy, astrophysics and neighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. ...The abstracts are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world." Space Science Reviews#1 "Dividing the whole field plus related subjects into 108 categories, each work is numbered and most are accompanied by brief abstracts. Fairly comprehensive cross-referencing links relevant papers to more than one category, and exhaustive author and subject indices are to be found at the back, making the catalogues easy to use. The series appears to be so complete in its coverage and always less than a year out of date that I shall certainly have to make a little more space on those shelves for future volumes." The Observatory Magazine#2
