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The Coevolution Of Magnetic Fields And Galaxies In Different Environments
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Book Synopsis The Coevolution of Magnetic Fields and Galaxies in Different Environments by : Anna Williams
Download or read book The Coevolution of Magnetic Fields and Galaxies in Different Environments written by Anna Williams and published by . This book was released on 2018 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic fields pervade the universe. They are observed on all astrophysical scales, from planets to the intracluster medium. Despite their ubiquity, the origin and evolution of magnetic fields remains an outstanding question in astrophysics. In this thesis, I present new observations towards the construction of the cosmological timeline of magnetic field evolution. With the Westerbork Synthesis Radio Telescope, I probe a new physical depth into the magnetic field structure of the nearside halo of spiral galaxy NGC 6946. By combining these data with previous observations at other frequencies, I model the magnetic field structure along the line of sight from the midplane to the halo. I find that the galaxy is best described by a clumpy turbulent medium that extends from the midplane to the thick synchrotron disk (~1 kpc), and estimate the scale and strength of the turbulent fields in the halo. From the isolated NGC 6946, I move to the loose galaxy group, NGC 2563, to study the magnetic fields in the intragroup medium. By comparing the Faraday rotation of distant sources behind NGC 2563 to the rotation measures of sources with sightlines surrounding it, I am unable to detect signs of large-scale fields as was previously observed in galaxy clusters. I show evidence for a radial decrease in the Faraday dispersion, as well as an increase in the magnitude of the Faraday rotation with impact distance to a known galaxy member. These last two observations suggest the presence of magnetic fields in the intragroup medium as well as a mechanism for magnetizing that medium. Lastly, I present new observations of the Faraday rotation of 149 QSOs at 0.6
Book Synopsis The Dynamic Role of Magnetic Fields in Galaxy Evolution by : James McBride
Download or read book The Dynamic Role of Magnetic Fields in Galaxy Evolution written by James McBride and published by . This book was released on 2014 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic fields are present in a variety of astrophysical environments, where they can affect the motions and structure of matter. Observations of magnetic fields in the Milky Way show that magnetic fields are an important force acting on gas in the interstellar medium. Observing magnetic fields outside of the Milky Way is challenging, and the most reliable observations of extragalactic magnetic fields are in galaxies similar to the Milky Way. This dissertation focuses on results from observations of magnetic fields in galaxies at a very different stage of their evolution than the Milky Way. There are two main types of galaxies described here: starburst galaxies and early-type galaxies. Starburst galaxies are galaxies that are very rapidly forming stars as a result of a merger, and represent a short lived, but dramatic, phase during galaxy evolution. Early-type galaxies have limited star formation, and typically have little remaining gas. The three main approaches I use to study extragalactic magnetic fields are: (i) directly measuring magnetic fields via Zeeman splitting, targeting starburst galaxies that host such strong OH maser lines that they are called OH megamasers (OHMs); (ii) exploring the excitation of OH in both starburst galaxies and early-type galaxies, in order to understand how and where OHMs are produced; and (iii) assessing the quality of an alternative method of measuring magnetic fields in galaxies based on measuring synchrotron fluxes, looking in starburst galaxies and one early-type galaxy. Using both single dish and interferometric observations of Zeeman splitting in OHMs, I find that magnetic fields are dynamically important within starburst galaxies, both on scales relevant to star formation (roughly a parsec), and on larger scales with the interstellar medium of starburst galaxies. I discuss observations of OH lines in starburst galaxies and in early-type galaxies, and conclude that they support models in which OHMs are excited radiatively through far-infrared emission. I present evidence that estimates of magnetic fields from applying the minimum energy argument to observations of synchrotron fluxes are wrong in two very different environments: the interstellar medium of starburst galaxies and a radio jet in an early-type galaxy.
Book Synopsis Large-scale Magnetic Fields in the Universe by : Rainer Beck
Download or read book Large-scale Magnetic Fields in the Universe written by Rainer Beck and published by Springer. This book was released on 2012-11-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of sixteen coordinated reviews on the origins of large-scale magnetic fields in the Universe, this book discusses magnetic fields in all relevant astrophysical contexts, from the interstellar medium to the scales of galaxies and clusters of galaxies. Magnetic fields are described in their very diverse environments, from stellar winds to galactic haloes and astrophysical jets; together with the roles they play in forming the structures and shaping the dynamics of these objects. Both observational evidence and its theoretical interpretations are covered up to the largest scales in the Universe. The authors are all leading scientists in their fields, making this book an authoritative, up-to-date and enduring contribution to astrophysics. This volume is aimed at graduate students and researchers in astrophysics. Previously published in Space Science Reviews journal, Vol. 166/1-4 and Vol. 169/1-4, 2012.
Book Synopsis Magnetic Fields of Galaxies by : A.A. Ruzmaikin
Download or read book Magnetic Fields of Galaxies written by A.A. Ruzmaikin and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetism, when extended beyond normal frameworks into cosmic space is characterized by an enormous spatial scale. Because of their large sizes the nature of magnets such as the Earth and the Sun is entirely different from the nature of a horseshoe magnet. The source of cosmic magnetism is associated with the hydrodynamic motions of a highly conductive medium. In this aspect, cosmic magnets resemble a dynamo. However, currents in the dynamo flow along properly ordered wires, while chaotic, turbulent motions are dominant inside stars and liquid planetary cores. This makes more intriguing and surprising the fact that these motions maintain a regular magnetic field. Maintenance of magnetic fields is even more impressive in huge magnets, i.e. galaxies. In fact, we are living inside a giant dynamo machine, the Milky Way galaxy. Although the idea of the global magnetic field of our Galaxy was clearly proposed almost 40 years ago, firm observational evidence and definite theoretical concepts of galactic magnetism have been developed only in the last decade. This book is the first attempt at a full and consistent presentation of this problem. We discuss both theoretical views on the origin of galactic magnetism and the methods of observational study. Previous discussions were on the level of review articles or separate chapters in monographs devoted to cosmic magnetic fields (see, e.g., H. K. Moffatt, 1978, E. N. Parker, 1979 and Zeldovich et aI., 1983).
Book Synopsis Magnetic Fields in Galaxies by : F. Krause
Download or read book Magnetic Fields in Galaxies written by F. Krause and published by CRC Press. This book was released on 1990 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the proceedings of the Workshop on Magnetic Fields in Galaxies, which was held in Potsdam (GDR) in the autumn of 1988.
Book Synopsis Galactic and Intergalactic Magnetic Fields by : Ulrich Klein
Download or read book Galactic and Intergalactic Magnetic Fields written by Ulrich Klein and published by Springer. This book was released on 2014-11-05 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This course-tested textbook conveys the fundamentals of magnetic fields and relativistic plasma in diffuse cosmic media, with a primary focus on phenomena that have been observed at different wavelengths. Theoretical concepts are addressed wherever necessary, with derivations presented in sufficient detail to be generally accessible. In the first few chapters the authors present an introduction to various astrophysical phenomena related to cosmic magnetism, with scales ranging from molecular clouds in star-forming regions and supernova remnants in the Milky Way, to clusters of galaxies. Later chapters address the role of magnetic fields in the evolution of the interstellar medium, galaxies and galaxy clusters. The book is intended for advanced undergraduate and postgraduate students in astronomy and physics and will serve as an entry point for those starting their first research projects in the field.
Book Synopsis The Strongest Magnetic Fields in the Universe by : Vasily S. Beskin
Download or read book The Strongest Magnetic Fields in the Universe written by Vasily S. Beskin and published by Springer. This book was released on 2016-01-29 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume extends the ISSI series on magnetic fields in the Universe into the domain of what are by far the strongest fields in the Universe, and stronger than any field that could be produced on Earth. The chapters describe the magnetic fields in non-degenerate strongly magnetized stars, in degenerate stars (such as white dwarfs and neutron stars), exotic members called magnetars, and in their environments, as well as magnetic fields in the environments of black holes. These strong fields have a profound effect on the behavior of matter, visible in particular in highly variable processes like radiation in all known wavelengths, including Gamma-Ray bursts. The generation and structure of such strong magnetic fields and effects on the environment are also described.
Book Synopsis Galactic and Intergalactic Magnetic Fields by : R. Beck
Download or read book Galactic and Intergalactic Magnetic Fields written by R. Beck and published by Springer. This book was released on 1990-04-30 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Symposium, the first devoted entirely to the measurement and the role of magnetic fields in the non-solar Universe, was held in Heidelberg, on June 19-23, 1989. The meeting began with review talks on magnetic phenomena near the solar photosphere, corona, and in stellar winds, since these nearby "laboratories", studied for many years, provide much of the prior knowl edge of magnetic effects in astrophysical plasmas. The Symposium contained presentations of considerable new work concerning the role of magnetic fields in accretion disks, bipolar outflows, and related magnetic phenomena in molecular clouds and star forming regions. Both observa tions and related theory of the large-scale magnetic fields in the Milky Way were covered, in addition to a session on the more general theme of magnetohydrodynamics of galactic magnetic fields. Dynamo mechanisms were discussed in considerable detail. It was apparent that recent observational data on polarized emission from external galaxies are now of sufficiently high quality that meaningful tests of large-scale field amplification, and of ideas on the origin of galactic magnetic fields, can be undertaken. Both new observations and numerical simulation work were described in the context of active galaxy nuclei, supernova remnants, radio source jets and extended lobes, and also in the environment of galaxy clusters. Recent large-scale computer simulations incorporating magnetic fields in star formation, radio source jets, and many other phenomena were presented, and much of this was very new.
Book Synopsis Cosmic Magnetic Fields by : Philipp P. Kronberg
Download or read book Cosmic Magnetic Fields written by Philipp P. Kronberg and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Galactic and Intergalactic Magnetic Fields by : R. Beck
Download or read book Galactic and Intergalactic Magnetic Fields written by R. Beck and published by Springer. This book was released on 1990-05-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Symposium, the first devoted entirely to the measurement and the role of magnetic fields in the non-solar Universe, was held in Heidelberg, on June 19-23, 1989. The meeting began with review talks on magnetic phenomena near the solar photosphere, corona, and in stellar winds, since these nearby "laboratories", studied for many years, provide much of the prior knowl edge of magnetic effects in astrophysical plasmas. The Symposium contained presentations of considerable new work concerning the role of magnetic fields in accretion disks, bipolar outflows, and related magnetic phenomena in molecular clouds and star forming regions. Both observa tions and related theory of the large-scale magnetic fields in the Milky Way were covered, in addition to a session on the more general theme of magnetohydrodynamics of galactic magnetic fields. Dynamo mechanisms were discussed in considerable detail. It was apparent that recent observational data on polarized emission from external galaxies are now of sufficiently high quality that meaningful tests of large-scale field amplification, and of ideas on the origin of galactic magnetic fields, can be undertaken. Both new observations and numerical simulation work were described in the context of active galaxy nuclei, supernova remnants, radio source jets and extended lobes, and also in the environment of galaxy clusters. Recent large-scale computer simulations incorporating magnetic fields in star formation, radio source jets, and many other phenomena were presented, and much of this was very new.
Book Synopsis The Co-evolution of Galaxies and Their Surrounding Environments in Massive Galaxy Clusters by : Steven Ehlert
Download or read book The Co-evolution of Galaxies and Their Surrounding Environments in Massive Galaxy Clusters written by Steven Ehlert and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A key yet poorly understood component to galaxy evolution models is the influence of the local environment, and is a particularly important aspect to understanding the evolution in galaxy clusters. Galaxy clusters are not only host to significant overdensities of galaxies, but these galaxies are embedded in a hot, diffuse Intracluster Medium (ICM). The ICM has long been observed to have important and lasting impacts on the properties of their constituent galaxies, which are commonly attributed to a number of unique astrophysical processes such as the stripping of galaxy gas by the ICM due to ram pressure and repeated tidal interactions. The galaxies in turn have also been observed to play an important role in the evolution of the ICM, especially near the centers of galaxy clusters where powerful outbursts from Active Galactic Nuclei (AGN) can provide a quasi-steady source of heating to the surrounding ICM, a process known as AGN feedback. Although great progress has been made in recent years to understand the connection between galaxies and the ICM, the precise influence of the ICM on cluster galaxies and the astrophysical processes that drive galaxy evolution in clusters are still subject to important uncertainties. It is clear from the data, however, that the predictions of the simplest models of ram pressure stripping, tidal encounters, and AGN feedback are inconsistent with observations; in particular observations taken with the modern generation of X-ray telescopes such as Chandra and XMM-Newton. These telescopes, with their superb angular resolution, large collecting areas, and wide fields of view, have revolutionized our understanding of galaxies in clusters, in particular for AGN. In this thesis, I will present a series of results regarding the nature of ram pressure stripping, harassment, and AGN feedback in cluster member galaxies driven primarily by X-ray observations. These results include multiwavelength observations of one of the most extreme cases of AGN feedback currently known, a mosaic of galaxies in the nearby Virgo Cluster which are all undergoing different variants of ramp pressure stripping, and the first set of results from one of the largest X-ray AGN surveys ever undertaken with Chandra. All of these results suggest an intricate choreography between the gas reservoirs initially hosted by galaxies and the surrounding ICM, with tests that investigate length scales ranging from 10 kpc to 1 Mpc.
Book Synopsis Magnetic Fields in Galaxy Clusters by : Aurora Simionescu
Download or read book Magnetic Fields in Galaxy Clusters written by Aurora Simionescu and published by GRIN Verlag. This book was released on 2008-06-25 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bachelor Thesis from the year 2005 in the subject Astronomy, grade: 1,0, University of Bremen, language: English, abstract: An adaptive mesh refinement simulation of galaxy cluster formation was performed that included the passive evolution of a magnetic field. It was found that structure formation plays an important role in amplifying large-scale magnetic fields and that the magnetic properties of the obtained cluster were in good agreement with recent observations. The initial field was amplified by a factor of up to 1000 during the formation of the cluster, and the field strength was seen to be well correlated with the gas density. We further found a magnetic energy power spectrum that is well described by -5/3 Kolmogorov-type turbulence. Near the accretion shocks on the outskirts of the cluster, the magnetic field is amplified well beyond the value expected from mere compression of gas. Here, shear flows lead to a substantial increase in field strength. Realistic Faraday rotation measures were obtained from the simulation data, which was however not resolved well-enough to allow for a more quantitative analysis.
Book Synopsis Coevolution of Black Holes and Galaxies: Volume 1, Carnegie Observatories Astrophysics Series by : Luis C. Ho
Download or read book Coevolution of Black Holes and Galaxies: Volume 1, Carnegie Observatories Astrophysics Series written by Luis C. Ho and published by Cambridge University Press. This book was released on 2004-09-09 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was originally published in 2004. Black holes are among the most mysterious objects in the Universe. Weighing up to several billion Suns, massive black holes have long been suspected to be the central powerhouses of energetic phenomena such as quasars. Advances in astronomy have not only provided spectacular proof of this long-standing paradigm, but have revealed the unexpected result that far from being rare, exotic beasts, they inhabit the center of virtually all large galaxies. Candidate black holes have been identified in increasingly large numbers of galaxies, both inactive and active, to the point where statistical studies are possible. Fresh work has highlighted the close connection between the formation, growth, and evolution of supermassive black holes and their host galaxies. This volume contains the invited lectures from an international symposium that was held to explore this exciting theme, and is a valuable review for professional astronomers and graduate students.
Book Synopsis Physical Conditions Including Magnetic Fields in Several Star Forming Regions of the Galaxy by : Matt Lykins
Download or read book Physical Conditions Including Magnetic Fields in Several Star Forming Regions of the Galaxy written by Matt Lykins and published by . This book was released on 2010 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Astrophysical Magnetic Fields by : Anvar Shukurov
Download or read book Astrophysical Magnetic Fields written by Anvar Shukurov and published by . This book was released on 2022 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic fields permeate space and affect many major astrophysical phenomena, but they are often ignored due to their perceived complexity. This self-contained introduction to astrophysical magnetic fields provides both a comprehensive review of the current state of the subject and a critical discussion of the latest research. It presents our knowledge of magnetic fields from the Early Universe, their evolution in cosmic time through to their roles in present-day galaxies, galaxy clusters and the wider intergalactic medium, with attention given to both theory and observations. This volume also contains an extensive introduction into magnetohydrodynamics, numerous worked examples, observational and mathematical techniques and interpretations of the observations. Its review of our current knowledge, with an emphasis on results that are likely to form the basis for future progress, benefits a broad audience of advanced students and active researchers, including those from fields such as cosmology and general relativity.
Book Synopsis Magnetic Fields in Sun-like Stars and Their Effects on Circumstellar Environments by : Julián David Alvarado-Gómez
Download or read book Magnetic Fields in Sun-like Stars and Their Effects on Circumstellar Environments written by Julián David Alvarado-Gómez and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulations of Magnetic Fields in Interacting Galaxies by : Annette Monika Geng
Download or read book Numerical Simulations of Magnetic Fields in Interacting Galaxies written by Annette Monika Geng and published by . This book was released on 2013 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:
