Download or read book Ultra Compact High Velocity Clouds In The ALFALFA HI Survey written by Elizabeth Ann Kovenz Adams and published by . This book was released on 2014 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Systematic Wide field Search for Stars Associated with ALFALFA Ultra compact High Velocity Clouds written by Nicholas J. Smith and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arecibo Legacy Fast ALFA (ALFALFA) survey was a blind neutral hydrogen (HI) survey that scanned 7,000 square degrees of the sky with the Arecibo radio telescope and catalogued more than 30,000 objects. Among those objects are approximately 100 Ultra-Compact High Velocity Clouds (UCHVCs), which are HI clouds that have masses and velocities that suggest that they may reside in low-mass dark matter halos located in or around the Local Group. Crucially, the UCHVCs do not have any known optical counterparts and thus are ideal locations to search for stars associated with as-yet undetected nearby dwarf galaxies. This thesis is a continuation of an optical survey begun by our group. We observed 26 additional UCHVCs with the WIYN 3.5-m telescope, adding to the 23 that were analyzed in Janesh (2018). In addition to analyzing more UCHVCs, I made improvements to the stellar detection pipeline and incorporated additional interactive steps to ensure the accuracy of the results. I also added in a cross-matching routine using data from the Gaia mission and Sloan Digital Sky Survey to remove possible contaminants (e.g., foreground stars, unresolved background galaxies) from our photometry catalog and improve our ability to find genuine stars associated with the HI clouds. From the sample of UCHVCs we analyzed, we identified six dwarf galaxy candidates with absolute V-band magnitudes -2 to -8 and distances between 270 and 870 kpc. We compared the estimated optical properties of our most convincing candidate with predictions from theoretical simulations and a recent census of the Local Group and found them broadly consistent. We also investigated the possibility that one of the UCHVCs is a gas cloud associated with the Galactic globular cluster Pal 3. We identified two stellar overdensities with modest significance at similar distances to Pal 3 and near the HI source, but note that they would imply a much larger gas mass than one would expect to be associated with a globular cluster. Finally, we discussed the future observations and analysis that would be valuable for determining whether the identified stellar overdensities are true dwarf galaxies as well as highlight the dwarf galaxy discoveries expected from the Rubin Observatory.
Download or read book An HI Study of Compact High velocity Clouds written by Vincent de Heij and published by . This book was released on 2002 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book An H I Study of Compact High velocity Clouds written by Vincent De Heij and published by . This book was released on 2002 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High velocity Clouds written by B. P. Wakker and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Evolution of Galaxies Through the Neutral Hydrogen Window written by Robert Minchin and published by American Institute of Physics. This book was released on 2008-08-14 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: This conference brought together observers and theorists to discuss what we are learning from the current generation of extragalactic neutral hydrogen observations and what prospects lie ahead, with particular emphasis on the exciting prospects for the next 3 to 10 years with the major U.S. facilities.
Download or read book Constraining the Origin of a Very High Velocity Cloud Toward M33 written by Stanley Lucas Denny and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Philosophy of Cosmology written by Khalil Chamcham and published by Cambridge University Press. This book was released on 2017-04-13 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following a long-term international collaboration between leaders in cosmology and the philosophy of science, this volume addresses foundational questions at the limit of science across these disciplines, questions raised by observational and theoretical progress in modern cosmology. Space missions have mapped the Universe up to its early instants, opening up questions on what came before the Big Bang, the nature of space and time, and the quantum origin of the Universe. As the foundational volume of an emerging academic discipline, experts from relevant fields lay out the fundamental problems of contemporary cosmology and explore the routes toward finding possible solutions. Written for graduates and researchers in physics and philosophy, particular efforts are made to inform academics from other fields, as well as the educated public, who wish to understand our modern vision of the Universe, related philosophical questions, and the significant impacts on scientific methodology.
Download or read book The Messenger written by and published by . This book was released on 2006 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Cambridge Photographic Atlas of Galaxies written by Michael König and published by Cambridge University Press. This book was released on 2017-09-07 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference atlas showcases around 250 beautiful galaxies within an amateur astronomer's reach and uses them to explain current astrophysical research.
Download or read book Advancing astrophysics with the square kilometre array proceedings from a meeting held in Giardini Naxos Sicily Italy 9 13 June 2014 written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Evolution of Galaxies written by Francesca Matteucci and published by Springer Science & Business Media. This book was released on 2012-01-05 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: The term “chemical evolution of galaxies” refers to the evolution of abundances of chemical species in galaxies, which is due to nuclear processes occurring in stars and to gas flows into and out of galaxies. This book deals with the chemical evolution of galaxies of all morphological types (ellipticals, spirals and irregulars) and stresses the importance of the star formation histories in determining the properties of stellar populations in different galaxies. The topic is approached in a didactical and logical manner via galaxy evolution models which are compared with observational results obtained in the last two decades: The reader is given an introduction to the concept of chemical abundances and learns about the main stellar populations in our Galaxy as well as about the classification of galaxy types and their main observables. In the core of the book, the construction and solution of chemical evolution models are discussed in detail, followed by descriptions and interpretations of observations of the chemical evolution of the Milky Way, spheroidal galaxies, irregular galaxies and of cosmic chemical evolution. The aim of this book is to provide an introduction to students as well as to amend our present ideas in research; the book also summarizes the efforts made by authors in the past several years in order to further future research in the field.
Download or read book Galactic Astronomy written by James Binney and published by Princeton University Press. This book was released on 2021-07-13 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the definitive treatment of the phenomenology of galaxies--a clear and comprehensive volume that takes full account of the extraordinary recent advances in the field. The book supersedes the classic text Galactic Astronomy that James Binney wrote with Dimitri Mihalas, and complements Galactic Dynamics by Binney and Scott Tremaine. It will be invaluable to researchers and is accessible to any student who has a background in undergraduate physics. The book draws on observations both of our own galaxy, the Milky Way, and of external galaxies. The two sources are complementary, since the former tends to be highly detailed but difficult to interpret, while the latter is typically poorer in quality but conceptually simpler to understand. Binney and Merrifield introduce all astronomical concepts necessary to understand the properties of galaxies, including coordinate systems, magnitudes and colors, the phenomenology of stars, the theory of stellar and chemical evolution, and the measurement of astronomical distances. The book's core covers the phenomenology of external galaxies, star clusters in the Milky Way, the interstellar media of external galaxies, gas in the Milky Way, the structure and kinematics of the stellar components of the Milky Way, and the kinematics of external galaxies. Throughout, the book emphasizes the observational basis for current understanding of galactic astronomy, with references to the original literature. Offering both new information and a comprehensive view of its subject, it will be an indispensable source for professionals, as well as for graduate students and advanced undergraduates.
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 The Discovery of Cosmic Voids written by Laird A. Thompson and published by Cambridge University Press. This book was released on 2020-12-10 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: The large-scale structure of the Universe is dominated by vast voids with galaxies clustered in knots, sheets, and filaments, forming a great 'cosmic web'. In this personal account of the major astronomical developments leading to this discovery, we learn from Laird A. Thompson, a key protagonist, how the first 3D maps of galaxies were created. Using non-mathematical language, he introduces the standard model of cosmology before explaining how and why ideas about cosmic voids evolved, referencing the original maps, reproduced here. His account tells of the competing teams of observers, racing to publish their results, the theorists trying to build or update their models to explain them, and the subsequent large-scale survey efforts that continue to the present day. This is a well-documented account of the birth of a major pillar of modern cosmology, and a useful case study of the trials surrounding how this scientific discovery became accepted.
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.
