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Author : William Romanishin
Publisher :
ISBN 13 :
Total Pages : 161 pages
Book Rating : 4.:/5 (246 download)
Download or read book Low Surface Brightness Spiral Galaxies written by William Romanishin and published by . This book was released on 1980 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Willem Jan Geert de Blok
Publisher :
ISBN 13 :
Total Pages : 196 pages
Book Rating : 4.3/5 (91 download)
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:
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 : David Merritt
Publisher : Cambridge University Press
ISBN 13 : 1108665683
Total Pages : 285 pages
Book Rating : 4.1/5 (86 download)
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.
Author : Robert A. Swaters
Publisher :
ISBN 13 :
Total Pages : 196 pages
Book Rating : 4.:/5 (321 download)
Download or read book Dark Matter in Late-type Dwarf Galaxies written by Robert A. Swaters and published by . This book was released on 1999 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In this thesis a study of the rotation curves and the dark matter properties of late-type dwarf galaxies is presented."--Abstract.
Author : Michael S. Fusco
Publisher :
ISBN 13 :
Total Pages : 292 pages
Book Rating : 4.:/5 (116 download)
Download or read book The Disk Structure of Late Type Galaxies written by Michael S. Fusco and published by . This book was released on 2019 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation pertains to the geometric structure of late type (spiral) galaxies, specifically on the relation between the logarithmic spiral pitch angle of the galactic spiral arms with other properties of the galaxy, such as central Supermassive Black Hole (SMBH) mass. Our work continues a study of the Black Hole Mass Function (BHMF) in local galaxies by recording the pitch angles of spiral galaxies with lower surface brightness than were previously included. We also conduct a case study on the structure of an interestingly shaped galaxy, UGC 4599. Previous studies on the topic of spiral arm pitch angles have measured the pitch angle of galaxies using a variety of image analysis techniques. Here the effectiveness of two of these techniques are assessed under different galaxy conditions and their errors and failure modes are probed as the measurement characteristics of simulated galaxies are manipulated and degraded. This is done for the purpose of recognizing and accounting for the limits of techniques for measuring the pitch angles of galaxies as they increase in redshift or decrease in surface brightness or angular resolution (pixel size). As a result, imaging based relations in galaxy structure may be applied to extend measurements from the local universe to greater distances as long as image degradation with distance is accounted for. In exploring populations of galaxies, errors in distribution studies might result from gaps in selection; galaxies with too little apparent structure or too faint a surface brightness to be recognized as spirals and included in the study. Errors might also result from inaccuracy or failure on the measurement side, where low resolution, low surface brightness galaxies produce pitch angle measurements characterized by higher failure rates and higher associated errors for successful measurements. We work to employ new techniques to minimize these errors as well as understand and account for their effects on the distributions being measured.
Author : Sidney Van den Bergh
Publisher : Cambridge University Press
ISBN 13 : 0521623359
Total Pages : 125 pages
Book Rating : 4.5/5 (216 download)
Download or read book Galaxy Morphology and Classification written by Sidney Van den Bergh and published by Cambridge University Press. This book was released on 1998-04-16 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: A concise and up-to-date guide to the shape of galaxies and how they can be classified, by one of the pioneers of the field.
Author : International Astronomical Union. Symposium
Publisher : Springer
ISBN 13 :
Total Pages : 778 pages
Book Rating : 4.X/5 (4 download)
Download or read book Unsolved Problems of the Milky Way written by International Astronomical Union. Symposium and published by Springer. This book was released on 1996-06-30 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 169th Symposium of the International Astronomical Union, held in The Hague, the Netherlands, August 23-29, 1994
Author : Lynn D. Matthews
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (313 download)
Download or read book Exploration of the Tully-Fisher Relation in Low Surface Brightness Galaxies at the End of the Spiral Sequence written by Lynn D. Matthews and published by . This book was released on 1996 with total page 16 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 : Ioannis Andredakis
Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.3/5 (91 download)
Download or read book Spheroidal Components of Spiral Galaxies written by Ioannis Andredakis and published by . This book was released on 1997 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Surface Brightness Distribution of Virgo Cluster Galaxies written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have acquired near-IR H and optical $g$, $r$, $i$, $z$ imaging for a sample of 299 Virgo cluster galaxies down to a limiting magnitude of B$_T$=16.0 mag. The low sensitivity of near-IR wavelengths to dust extinction is crucial for an unbiased geometric deprojection of fundamental galaxy parameters. We find, in agreement with Tully and Verheijen (1997), a clear dichotomy between high and low surface brightness galaxy disks. The difference between the low and high brightness peaks of Virgo galaxies is $\sim$2 H-mag arcsec$^{-2}$, significantly larger than any systematic errors. The high surface brightness galaxies have two distinct classes of bulge with high and low concentration, while low surface brightness galaxies have only low concentration bulges. The distribution of the effective surface brightnesses of our entire sample shows that early-type galaxies exhibit a similar structural bimodality though offset from that of spiral galaxies towards higher surface brightnesses. We find that the structural bimodality is uncorrelated with colour or any other structural parameter except, perhaps, the circular velocity. Simulations of realistic surface brightness profiles show that a bimodality in effective surface brightness is unexpected based on normal distributions of fundamental bulge and disk parameters. Rather, the structural bimodality is likely linked to the galaxy dynamics, namely the specific angular momentum of the galaxy; high surface brightness galaxies have low angular momentum and can collapse to form dynamically important disks, while low surface brightness galaxies are dominated by the dark halo everywhere. Finally, our bulge-disk decompositions of all the sample galaxy images using various fitting functions have revealed that galaxies of all morphologies, including flattened and spheroidal systems, exhibit a ``disk'' component which is best described by a generalized ``Sersic'' function. We also find that the majority of galaxy disks show significant devi.
Author : Johan H. Knapen
Publisher : Springer
ISBN 13 : 3319565702
Total Pages : 367 pages
Book Rating : 4.3/5 (195 download)
Download or read book Outskirts of Galaxies written by Johan H. Knapen and published by Springer. This book was released on 2017-07-09 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of invited reviews written by world-renowned experts on the subject of the outskirts of galaxies, an upcoming field which has been understudied so far. These regions are faint and hard to observe, yet hide a tremendous amount of information on the origin and early evolution of galaxies. They thus allow astronomers to address some of the most topical problems, such as gaseous and satellite accretion, radial migration, and merging. The book is published in conjunction with the celebration of the end of the four-year DAGAL project, an EU-funded initial training network, and with a major international conference on the topic held in March 2016 in Toledo. It thus reflects not only the views of the experts, but also the scientific discussions and progress achieved during the project and the meeting. The reviews in the book describe the most modern observations of the outer regions of our own Galaxy, and of galaxies in the local and high-redshift Universe. They tackle disks, haloes, streams, and accretion as observed through deep imaging and spectroscopy, and guide the reader through the various formation and evolution scenarios for galaxies. The reviews focus on the major open questions in the field, and explore how they can be tackled in the future. This book provides a unique entry point into the field for graduate students and non-specialists, and serves as a reference work for researchers in this exciting new field.
Author : David L. Block
Publisher : Springer Science & Business Media
ISBN 13 : 9401141142
Total Pages : 798 pages
Book Rating : 4.4/5 (11 download)
Download or read book Toward a New Millennium in Galaxy Morphology written by David L. Block and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt: South Africa - a land of paradigm shifts. A land where we are willing to leave behind the old, to bravely accept the new. What do we need to exit the dark ages in the morphology of galaxies? How prevalent is the cherishing of old concepts? Traditional morphology has been `mask-oriented', focusing on masks of dust and gas which may constitute only 5 percent of the dynamical mass of a galaxy. Some of the world's foremost astronomers flew to South Africa to address morphologically related issues at an International Conference, the proceedings of which are contained in this volume. Examine predicted extinction curves for primordial dust at high redshift. Stars evolve; why not dust? Read about the breakdown of the Hubble sequence at a redshift of one. Explore the morphology of rings; the mysteries of metal-rich globular clusters; vigorous star-formation in the Large Magellanic Cloud; the world of secular evolution, where galaxies change their shapes within one Hubble time. And much more. Examine a new kinematical classification scheme of the unmasked, dust-penetrated near-infrared images of spiral galaxies. This volume contains over 80 refereed contributions (including 18 in-depth keynote review articles), 40 pages of questions and answers, a panel discussion transcribed from tape and 24 colour plates. The volume is unique in that contributions from both high and low redshift experts are represented at a level readily accessible to postdoctoral students entering the exciting world of morphology - whether it be of the local, or more distant, Universe.
Download or read book The Surface Brightness Distribution of Virgo Cluster Galaxies written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have acquired near-IR H and optical $g$, $r$, $i$, $z$ imaging for a sample of 299 Virgo cluster galaxies down to a limiting magnitude of B$_T$=16.0 mag. The low sensitivity of near-IR wavelengths to dust extinction is crucial for an unbiased geometric deprojection of fundamental galaxy parameters. We find, in agreement with Tully and Verheijen (1997), a clear dichotomy between high and low surface brightness galaxy disks. The difference between the low and high brightness peaks of Virgo galaxies is $\sim$2 H-mag arcsec$^{-2}$, significantly larger than any systematic errors. The high surface brightness galaxies have two distinct classes of bulge with high and low concentration, while low surface brightness galaxies have only low concentration bulges. The distribution of the effective surface brightnesses of our entire sample shows that early-type galaxies exhibit a similar structural bimodality though offset from that of spiral galaxies towards higher surface brightnesses. We find that the structural bimodality is uncorrelated with colour or any other structural parameter except, perhaps, the circular velocity. Simulations of realistic surface brightness profiles show that a bimodality in effective surface brightness is unexpected based on normal distributions of fundamental bulge and disk parameters. Rather, the structural bimodality is likely linked to the galaxy dynamics, namely the specific angular momentum of the galaxy; high surface brightness galaxies have low angular momentum and can collapse to form dynamically important disks, while low surface brightness galaxies are dominated by the dark halo everywhere. Finally, our bulge-disk decompositions of all the sample galaxy images using various fitting functions have revealed that galaxies of all morphologies, including flattened and spheroidal systems, exhibit a ``disk'' component which is best described by a generalized ``Sersic'' function. We also find that the majority of galaxy disks show significant devi.
Author : Steve Phillipps
Publisher : John Wiley & Sons
ISBN 13 :
Total Pages : 330 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Structure and Evolution of Galaxies written by Steve Phillipps and published by John Wiley & Sons. This book was released on 2005-06-17 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Structure and Evolution of Galaxies is a concise introduction to this fascinating subject providing the reader with the fundamentals in a clear and accessible style. This user-friendly text assumes some prerequisite knowledge of astronomy, with the necessary mathematics kept to a minimum. Beginning with an introduction to the existence of our own external galaxies, the book moves on to discuss how perceptions of galaxy development have changed over time. The three categories of galaxies are then discussed with later chapters considering their formation and evolution. The book concludes with an overview of both current developments in the field and considers the direction of future research. Clear and accessible introduction to this dynamic subject Introduces definitions of key terms and puts them in context Includes current research and future developments in the field Appendix of basic definitions to clarify key concepts An invaluable text for students of astronomy and physics
Author : Edwin Powell Hubble
Publisher : Yale University Press
ISBN 13 : 9780300025002
Total Pages : 264 pages
Book Rating : 4.0/5 (25 download)
Download or read book The Realm of the Nebulae written by Edwin Powell Hubble and published by Yale University Press. This book was released on 1982-01-01 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: No modern astronomer made a more profound contribution to our understanding of the cosmos than did Edwin Hubble, who first conclusively demonstrated that the universe is expanding. Basing his theory on the observation of the change in distanct galaxies, called red shift, Hubble showed that this is a Doppler effect, or alteration in the wavelength of light, resulting from the rapid motion of celestial objects away from Earth. In 1935, Hubble described his principal observations and conclusions in the Silliman lectures at Yale University. These lectures were published the following year as "The Realm of the Nebulae," which quickly became a classic work.
