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Author :
Publisher :
ISBN 13 : 9789462598195
Total Pages : 144 pages
Book Rating : 4.5/5 (981 download)
Download or read book Reconstructing Magnetic Fields of Spiral Galaxies from Radiopolarimetric Observations written by and published by . This book was released on 2015 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ulrich Klein
Publisher : Springer
ISBN 13 : 3319089420
Total Pages : 250 pages
Book Rating : 4.3/5 (19 download)
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.
Author : F. Krause
Publisher : CRC Press
ISBN 13 : 9780677260204
Total Pages : 184 pages
Book Rating : 4.2/5 (62 download)
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.
Author : A.A. Ruzmaikin
Publisher : Springer Science & Business Media
ISBN 13 : 9400928351
Total Pages : 322 pages
Book Rating : 4.4/5 (9 download)
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).
Author : Rainer Beck
Publisher : Springer Science & Business Media
ISBN 13 : 3642726216
Total Pages : 286 pages
Book Rating : 4.6/5 (427 download)
Download or read book Interstellar Magnetic Fields written by Rainer Beck and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a Workshop, Held at Schloß Ringberg, September 8-12, 1986
Author : Nebojsa Duric
Publisher :
ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Interpretation of Modern Synthesis Observations of Spiral Galaxies written by Nebojsa Duric and published by . This book was released on 1991 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. Beck
Publisher : Springer Science & Business Media
ISBN 13 : 9780792307044
Total Pages : 582 pages
Book Rating : 4.3/5 (7 download)
Download or read book Galactic and Intergalactic Magnetic Fields written by R. Beck and published by Springer Science & Business Media. This book was released on 1990-04-30 with total page 582 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.
Author : Timothy Robishaw
Publisher : Universal-Publishers
ISBN 13 : 1599426846
Total Pages : 173 pages
Book Rating : 4.5/5 (994 download)
Download or read book Magnetic Fields Near and Far written by Timothy Robishaw and published by Universal-Publishers. This book was released on 2008 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: According to astrophysical theory, magnetic fields should play an important role in the structure and dynamics of the interstellar medium. While astronomical observations confirm this directly, the observational record is sparse. This is because magnetic fields can only be measured via polarimetric methods, and most of these methods can only provide an indirect inference of the magnetic field strength. The Zeeman effect, however, is the only method by which in situ measurements of astrophysical magnetic fields can be made. The spectral signature of Zeeman splitting is imprinted in the circular polarization spectrum of radiation received from an astronomical source. In order to make a reliable detection at radio frequencies, one must employ careful calibrations and account for instrumental effects. We begin this dissertation by covering the fundamentals of radio spectropolarimetry. We then offer historical details regarding the Zeeman effect and its use in single-dish radio observations. We present an outline of how one accurately measures the Zeeman effect using large single-dish radio telescopes. We follow this with results from an assessment of the polarization properties of the 100 m Green Bank Telescope (GBT). We then present magnetic field detections made via the Zeeman effect from the Galactic scale to cosmological distances. We begin with GBT observations of 21 cm emission toward the Taurus Molecular Cloud (TMC) complex. Recent observations have suggested that fields stronger than 20 microgauss are located at the distance of the TMC. Our Zeeman observations rule out fields of this strength, but do show a clear +5 microgauss detection from HI emission at the velocity of the TMC. More surprisingly, we have discovered multiple detections of a line-of-sight magnetic field of strength roughly +40 microgauss in a filament near -50 km/s. We then present a windfall of detections of milligauss-strength magnetic fields in starburst galaxies. Detected by means of Zeeman splitting of 1667 MHz hydroxyl megamaser emission, these Arecibo and GBT results represent the first extragalactic Zeeman measurements to probe the field inside an external galaxy. Finally, we climb the cosmological distance ladder, and present a dramatic GBT detection of a magnetic field in a damped Lyman-alpha absorber at a redshift of 0.692. We discuss possible scenarios for the creation of an 84 microgauss field at a look-back time of 6.4 Gyr.
Author : Geert Dick van Albada
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.:/5 (27 download)
Download or read book The Peculiar Spiral Galaxy NGC 4258 written by Geert Dick van Albada and published by . This book was released on 1978 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary also in Dutch.
Author : Rainer Beck
Publisher : Springer
ISBN 13 :
Total Pages : 296 pages
Book Rating : 4.3/5 (91 download)
Download or read book Interstellar Magnetic Fields written by Rainer Beck and published by Springer. This book was released on 1987 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anna Williams
Publisher :
ISBN 13 :
Total Pages : 178 pages
Book Rating : 4.:/5 (18 download)
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
Author : R. Beck
Publisher : Springer
ISBN 13 : 9789400905696
Total Pages : 0 pages
Book Rating : 4.9/5 (56 download)
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.
Author : Amanda Ann Kepley
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (891 download)
Download or read book Magnetic Fields in Irregular Galaxies written by Amanda Ann Kepley and published by . This book was released on 2008 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. L. De Jong
Publisher :
ISBN 13 :
Total Pages : 102 pages
Book Rating : 4.:/5 (28 download)
Download or read book Observations of the Radio Frequency Brightness Distributions in Several Normal Spiral Galaxies written by M. L. De Jong and published by . This book was released on 1970 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jagedv S. Panesar
Publisher :
ISBN 13 :
Total Pages : 434 pages
Book Rating : 4.:/5 (896 download)
Download or read book Numerical Simulations of Magnetic Fields in Spiral Galaxies written by Jagedv S. Panesar and published by . This book was released on 1991 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (713 download)
Download or read book Magnetic Turbulence in Clusters of Galaxies written by and published by . This book was released on 2009 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Galaxy clusters are large laboratories for magnetic plasma turbulence which permit us to confront our theoretical concepts of magnetogenesis with detailed observations. Magnetic turbulence in clusters can be studied via the radio-synchrotron emission from the intra-cluster medium in the form of cluster radio relics and halos. The power spectrum of turbulent magnetic fields can be examined via Faraday rotation analysis of extended radio sources. In case of the Hydra A cool core, the observed magnetic spectrum can be understood in terms of a turbulence-mediated feedback loop between gas cooling and the jet activity of the central galaxy. Finally, methods to measure higher-order statistics of the magnetic field using Stokes-parameter correlations are discussed, which permit us to determine the power spectrum of the magnetic tension force. This fourth-order statistical quantity offers a way to discriminate between different magnetic turbulence scenarios and different field structures using radio polarimetric observations.
Author : Steven John Spencer
Publisher :
ISBN 13 :
Total Pages : 484 pages
Book Rating : 4.:/5 (221 download)
Download or read book Global Magnetic Fields in Spiral Galaxies written by Steven John Spencer and published by . This book was released on 1994 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
