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Author : Nicolson George Duncan
Publisher :
ISBN 13 :
Total Pages : 233 pages
Book Rating : 4.:/5 (775 download)
Download or read book The Spectra And Variability Of Extragalactic Radio Sources written by Nicolson George Duncan and published by . This book was released on 1974 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : George William Brandie
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.:/5 (425 download)
Download or read book A Radio Source at 8000 MHz written by George William Brandie and published by . This book was released on 1972 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D.S. Heeschen
Publisher : Springer Science & Business Media
ISBN 13 : 9400977816
Total Pages : 484 pages
Book Rating : 4.4/5 (9 download)
Download or read book Extragalactic Radio Sources written by D.S. Heeschen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: IAU Symposium 97, Extragalactic Radio Sources, was held at Albuquerque, New Mexico August 3-7, 1981. It was co-sponsored by IAU Commissions 28, 40, 47 and 48 and by URSI Commission J. Financial and organizational support were provided by the National Radio Astronomy Observatory, the University of New Mexico, and the National Science Foundation. A wide variety of interesting objects and phenomena can be covered under the heading "Extragalactic Radio Sources", and a diverse set of topics was in fact discussed at the symposium. Radio galaxies, quasars, Seyfert galaxies and BL Lacertids received the most attention, but normal galaxies, the galactic center, and even SS433 were also discussed. While the unifying theme of the symposium was radio emission, studies at all wavelengths--X-ray, UV, optical, IR, and radio--were included. In general, the emphasis was on individual objects and the physical processes associated with them, but there were also papers on statistical studies and cosmology. The symposium was attended by 209 scientists from 18 countries.
Author : Jacques Roland
Publisher : Cambridge University Press
ISBN 13 : 9780521416023
Total Pages : 392 pages
Book Rating : 4.4/5 (16 download)
Download or read book Extragalactic Radio Sources written by Jacques Roland and published by Cambridge University Press. This book was released on 1992-06-26 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physics of active galactic nuclei, the origin of extragalactic jets and the formation of extended extragalactic radio sources are among the most interesting challenges of modern astrophysics. This book contains the proceedings of the 7th meeting of the Institut d'Astrophysique de Paris, which drew together both theorists and observers in this exciting field. Recent observational data at X-ray, optical and radio wavelengths is discussed, and new theoretical developments concerning beam and jet formation models are considered. Special treatment is given to plasma physics problems related to particle acceleration, magnetic reconnection, beam-plasma interaction and coherent emission. The volume will be of use to all students and researchers who are working in this field.
Author : George William Brandie
Publisher :
ISBN 13 :
Total Pages : 139 pages
Book Rating : 4.:/5 (682 download)
Download or read book A RADIO SOURCE SURVEY AT 8000 MHZ: THE NUMBER, SPECTRA AND VARIABILITY OF EXTRAGALACTIC SOURCES. written by George William Brandie and published by . This book was released on 1972 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. Ekers
Publisher : Springer Science & Business Media
ISBN 13 : 9400902956
Total Pages : 666 pages
Book Rating : 4.4/5 (9 download)
Download or read book Extragalactic Radio Sources written by R. Ekers and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: On the 100th anniversary of Marconi's successful experiment on radio broadcasting, 250 astronomers from all over the world met in Bologna (Italy) for five days, to update their knowledge of the physics and statistical properties of powerful extragalactic radio sources. Since their discovery in the fifties enormous progress has been made. The existence of superluminal motions in the cores of radio sources, the presence there of a black hole surrounded by an absorbing dust torus, as inferred mostly from studies at other wavelengths, are now accepted ideas. Nevertheless, in spite of these efforts, there are many questions still unanswered. For instance we do not know which mechanism produces the huge amount of energy supplied to radio sources, how the jets connecting the `engine' to the lobes are formed and collimated, which of the differences observed among the various classes of radio sources are apparent and which are real. These and other related topics are discussed in this book.
Author : Klaus Meisenheimer
Publisher :
ISBN 13 :
Total Pages : 336 pages
Book Rating : 4.3/5 (91 download)
Download or read book Jets in Extragalactic Radio Sources written by Klaus Meisenheimer and published by . This book was released on 1993 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: The existence of jets emanating from the central sources of radio galaxies and quasars was perhaps the most important discovery for our understanding of the nature of active galactic nuclei. These proceedings present reviews and research papers on extragalactic radio sources. The book begins witha discussion of the phenomenology and models of radio sources. The main partis devoted to detailed studies of jets by VLBI, to the information obtained about the structure of the central source as deduced from variability studies, to production, confinement and velocity of jets as well as to numerical simulations of the jet phenomenon. Reviews of the two best studied jets - those in the radio galaxy M87 and the quasar 3C273 - illustrate our current observational picture of extragalactic radio jets in all accessible wavelength ranges. A section on the influence of the environment on radio galaxies concludes the book. This topical volume addresses researchers and graduate students in astrophysics.
Author : David De Young
Publisher : University of Chicago Press
ISBN 13 : 9780226144153
Total Pages : 588 pages
Book Rating : 4.1/5 (441 download)
Download or read book The Physics of Extragalactic Radio Sources written by David De Young and published by University of Chicago Press. This book was released on 2002 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extragalactic radio sources are among the most unusual and spectacular objects in the universe, with sizes in excess of millions of light years, radiated energies over ten times those of normal galaxies, and a unique morphology. They reveal some of the most dramatic physical events ever seen and provide essential clues to the basic evolutionary tracks followed by all galaxies and groups of galaxies. In The Physics of Extragalactic Radio Sources, David De Young provides a clearly written overview of what is currently known about these objects. A unique feature of the book is De Young's emphasis on the physical processes associated with extragalactic radio sources: their evolution, their environment, and their use as probes to solve other astrophysical problems. He also makes extensive use of the large amount of data now available from observations at x-ray, optical, and radio wavelengths to illustrate his main points. The Physics of Extragalactic Radio Sources will be a comprehensive introduction to the field for graduate students and a useful summary for astrophysicists.
Author : Marat G. Mingaliev
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (427 download)
Download or read book Spectral Characteristics and Variability of Radio Sources Near the North Celestial Pole written by Marat G. Mingaliev and published by . This book was released on 2009 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of our observations of compact extragalactic radio sources near the north celestial pole (+75° [less than or equal to] 0 [less than or equal to] +88°) obtained on the RATAN-600 radio telescope. Our sample consists of 51 radio sources with spectra that are either flat or inverted (growing toward shorter wavelengths) and with flux densities at 1.4 GHz S v [greater than or equal to] 200 mJy. We observed the sources at 1-21.7 GHz. Multi-frequency instantaneous spectra are presented for 1999-2007. We observed 33 of our sample source daily for 30 days in August 2007. As a result, we revealed 15 objects exhibiting rapid variations on time scales of a day. The multi-frequency instantaneous spectra of these sources indicate that radio flux variations on one-day timescales are characteristic of objects of various spectral types. More than half the sources exhibiting rapid variations demonstrate a growth in the variability amplitude with increasing frequency. For some of the objects, the variability amplitude is virtually independent of frequency.
Author : Maria J. Pantazopoulou
Publisher :
ISBN 13 :
Total Pages : 284 pages
Book Rating : 4.:/5 (358 download)
Download or read book Spectral Characteristics of Low-frequency Variability in Compact Extragalactic Radio Sources written by Maria J. Pantazopoulou and published by . This book was released on 1996 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.3/5 (91 download)
Download or read book Proceedings of the National Radio Astronomy Observatory Workshop on Low Frequency Variability of Extragalactic Radio Sources, Held in Green Bank, West Virginia, April 21-22, 1982 written by and published by . This book was released on 1984 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. D. Cotton
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (886 download)
Download or read book Low Frequency Variability of Extragalactic Radio Sources written by W. D. Cotton and published by . This book was released on 1982 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. Anton Zensus
Publisher : Cambridge University Press
ISBN 13 : 9780521392266
Total Pages : 430 pages
Book Rating : 4.3/5 (922 download)
Download or read book Parsec-Scale Radio Jets written by J. Anton Zensus and published by Cambridge University Press. This book was released on 1990-08-16 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quasars and active galaxies are the most powerful emitters of radiation in the universe. Modern radio telescope arrays have shown that the ultimate energy source resides in the central few parsecs of the galactic nucleus, and powers the emitting regions by way of two oppositely-directed relativistic jets of energy. This volume presents the latest observations and theories of these remarkable objects. Topics discussed include superluminal motions, the physics of jets and shock fronts in jets, related optical observations, and cosmic evolution. Particular attention is given to the "unified theories," which attempt to show that many of the phenomena in powerful extragalactic objects are different aspects of a single, basic mechanism; the main difference in their appearance is a result of their different orientation with respect to the observer.
Author : Wolfgang Priester
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.:/5 (31 download)
Download or read book Extragalactic Radio Sources written by Wolfgang Priester and published by . This book was released on 1965 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Merja Tornikoski
Publisher :
ISBN 13 : 9789512219483
Total Pages : 30 pages
Book Rating : 4.2/5 (194 download)
Download or read book Studies of extragalactic sources : observations and analysis of multifrequency spectra and variability written by Merja Tornikoski and published by . This book was released on 1994 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William D. Cotton
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.:/5 (219 download)
Download or read book Low Frequency Variability of Extragalactic Radio Sources written by William D. Cotton and published by . This book was released on 1982* with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. G. Pacholczyk
Publisher :
ISBN 13 :
Total Pages : 258 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Handbook of Radio Sources: Strong extragalactic sources, right ascension range 0 through 11 hours written by A. G. Pacholczyk and published by . This book was released on 1978 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
