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Author: K. I. Kellermann
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
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Book Description
The small scale structure of extragalactic radio sources has been studied at 18 and 6 cm wavelengths using a tape recording interferometer. At the longest antenna spacing, 10,536 km, the baselines at 6 cm was 176 million wavelengths and the resolution was about 0.0004 arc seconds for the stronger sources. Many sources, including optically identified galaxies and quasars, are found to have several distinct components of widely differing size in the range from the few hundredths of a second of arc to the limit of our resolution. Many sources, including 0106+01, 3C 273, 3C279, 1555+00, 2145+06, 3C 446, 3C 454.3, and 2345-16 all contain components which are unresolved on the longest baseline are less than .0004 arc sec. in diameter. Observations at shorter wavelengths are required to resolve these sources. Because the maximum brightness temperature is limited to 10 to the 12th power K, by inverse Compton scattering, baselines no greater than the diameter of the earth are probably adequate to resolve all of the stronger extragalactic sources. (Author).
Author: K. I. Kellermann
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
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Book Description
The small scale structure of extragalactic radio sources has been studied at 18 and 6 cm wavelengths using a tape recording interferometer. At the longest antenna spacing, 10,536 km, the baselines at 6 cm was 176 million wavelengths and the resolution was about 0.0004 arc seconds for the stronger sources. Many sources, including optically identified galaxies and quasars, are found to have several distinct components of widely differing size in the range from the few hundredths of a second of arc to the limit of our resolution. Many sources, including 0106+01, 3C 273, 3C279, 1555+00, 2145+06, 3C 446, 3C 454.3, and 2345-16 all contain components which are unresolved on the longest baseline are less than .0004 arc sec. in diameter. Observations at shorter wavelengths are required to resolve these sources. Because the maximum brightness temperature is limited to 10 to the 12th power K, by inverse Compton scattering, baselines no greater than the diameter of the earth are probably adequate to resolve all of the stronger extragalactic sources. (Author).
Author: John J. Broderick
Publisher:
ISBN:
Category : Astronomy
Languages : en
Pages : 7
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Author: A. G. Pacholczyk
Publisher: Elsevier
ISBN: 1483187977
Category : Science
Languages : en
Pages : 306
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Book Description
Radio Galaxies: Radiation Transfer, Dynamics, Stability and Evolution of a Synchrotron Plasmon deals with the physics of a region in space containing magnetic field and thermal and relativistic particles (a plasmon). The synchrotron emission and absorption of this region are discussed, along with the properties of its spectrum; its linear and circular polarization; transfer of radiation through such a region; its dynamics and expansion; and interaction with external medium. Comprised of eight chapters, this volume explores the stability, turbulence, and acceleration of particles in a synchrotron plasmon as well as its application to the physics of radio galaxies. The discussion begins with a description of extragalactic radio sources and their properties, followed by an analysis of the emission and absorption of synchrotron radiation. Subsequent chapters focus on the transfer of polarized radiation in a magnetoactive plasma; hydromagnetics and hydromagnetic stability; confinement and structure of extended radio sources; and radio-tail galaxies. The book also considers compact radio sources before concluding with an evaluation of radio source theories. This monograph is addressed primarily to radio astronomers and graduate students working on the interpretation of observational data.
Author: David B. Shaffer
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
Observations at 18 cm, with an angular resolution of approximately 0.01 sec., of the strongest compact radio sources with milliarcsecond structure at shorter wavelengths (6-2 cm) show that most of the sources are only slightly resolved, and most of the 18 cm radiation comes from quite small components, probably the same components seen at the short wavelengths. Some sources have brightness temperatures> 10 to the 12th power K. Weak emissions were detected from the nucleus of Centaurus A. The May, 1974 radio outburst of Cyg X-3 appears to have had an expansion velocity of about 0.2 c.
Author: Roberto Fanti
Publisher: Springer Science & Business Media
ISBN: 9789027717399
Category : Science
Languages : en
Pages : 522
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Book Description
I.A.U. symposium No. 110 on VLBI and Compact Radio Sources was held in Bologna, Italy from June 27 to July 1, 1983. 166 participants from 19 countries were registered and 106 invited and contributed papers were registered. The scientific presentations and discussion concentrated on VLBI observation and interpretation of galactic and extragalactic radio sour ces, including topics as diverse as quasars and galactic nuclei, inter stellar masers, pulsars, and astrometry. Geodetic applications and tech nical development were treated only briefly, as these topics have been the subject of other recent international symposia. Since the first VLBI observations in 1967, sensitivity, resolution, and image quality have improved dramatically. Radio maps shown at the symposium were of comparable quality to conventional synthesis maps be ing made at the time of the first VLBI experiments 15 years ago, but with a resolution more than a factor of 1000 better. We wanted to accommodate the large number of contributed papers in this rapidly developing field, but there was inadequate time for normal oral presentations and discussion. We therefore asked that all contrib uted papers be put on display for at least 24 hours prior to a brief oral summary. A question and discussion period followed groups of oral pres entations on the same or similar topic. In this way the opportunity for interactive discussion, not available in conventional poster displays, was preserved.
Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 912
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 308
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Book Description
Author: R. Ekers
Publisher: Springer Science & Business Media
ISBN: 9400902956
Category : Science
Languages : en
Pages : 666
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Book Description
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: National Radio Astronomy Observatory (U.S.)
Publisher:
ISBN:
Category : Astronomy
Languages : en
Pages : 568
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Author: S. Böhme
Publisher: Springer Science & Business Media
ISBN: 366212307X
Category : Science
Languages : en
Pages : 869
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Book Description
Astronomy and Astrophysics Abstracts, which has appeared in semi-annual volumes since 1969, is de voted to the recording, summarizing and indexing of astronomical publications throughout the world. It is prepared under the auspices of the International Astronomical Union (according to a resolution adopted at the 14th General Assembly in 1970). Astronomy and Astrophysics Abstracts aims to present a comprehensive documentation of literature in all fields of astronomy and astrophysics. Every effort will be made to ensure that the average time interval between the date of receipt of the original literature and publication of the abstracts will not exceed eight months. This time interval is near to that achieved by monthly abstracting journals, com pared to which our system of accumulating abstracts for about six months offers the advantage of greater convenience for the user. Volume 18 contains literature published in 1976 and received before March 1, 1977; some older liter ature which was received late and which is not recorded in earlier volumes is also included.
